Re: [M100] Listserv Search
I typed same text in all lines. Thanks. Out beyond my skis here but learning and having some fun. I'll probably fry the thing trying to fix it. On Sunday, July 26, 2020, 05:05:36 PM EDT, Ken Pettit wrote: Hey Chris, The LCD has 10 actual controller chips. Each one controls 4 lines x 50 pixels. The two completely blank areas on the screen are the exact size of one of the controllers. It looks like either those controllers are not functioning, or the enable signal driving them is not functioning (bad decoder IC, bad trace, bad connector). I can't tell if the others have missing single pixel columns, or if the text is actually missing some letters (i.e. should line 6 actually say "test of the TRS-80" or does it really have spaces instead of text there? Ken On 7/26/20 12:54 PM, Chris Fezzler wrote: No after market ROM. Logically, I would think the fact that the top four lines are perfect, the hard reset produces a perfect Menu screen, and just the bottom four lines are garbled would be a clue where to look. I know nothing other than reading a lot off Internet. My instinct tells me the issue is a component that regulates power or signals to the LCD driver chips for the bottom half of the screen. The are getting power (because we see gibberish and the perfect Menu screen) but perhaps it is the wrong voltage or intermittent power or signal. Thoughts are: Capacitors C47 or C54 and or M17 and/or M25. But I don't know how to determine their impact on the issue. On Sunday, July 26, 2020, 11:25:01 AM EDT, Jeffrey Birt wrote: When comparing your two pictures, after rotating them right side up, I noticed just now that not only do you have blank blocks but some of the characters are reversed. That is really bizarre. I’m not sure if that points to a problem with how the LCD drivers are being configured/initialized or what data is being sent to them. If the driver ships are outputting a built-in font here it might be a chip configuration issue. If the display is always bit mapped, then it would be something else. Do you have any sort of aftermarket ROM installed? Very interesting problem. Jeff Birt From: M100 On Behalf Of Chris Fezzler Sent: Sunday, July 26, 2020 9:47 AM To: m...@bitchin100.com Subject: Re: [M100] Listserv Search Gladly. On Sunday, July 26, 2020, 08:36:06 AM EDT, Jeffrey Birt wrote: Can you attach a picture of the cold boot screen too? The positive and negative clips go to a +5 and ground source on the M100 PCB itself. The PPS setting if ‘Pulses Per Second’ when using it as a logic pulser, i.e. to inject a pulsing signal. On the chip select lines you should she them quickly toggling. Jeff Birt From: M100 On Behalf Of Chris Fezzler Sent: Saturday, July 25, 2020 6:20 PM To: m...@bitchin100.com Subject: Re: [M100] Listserv Search ALERT: Beginner asking question. Reminder: Upon hard reset the LCD initializes perfectly and displays the main Menu screen perfectly. However, once in BASIC or TEXT the bottom four lines do not display correctly. (See attached.) (Planned to test LCD in M102 but it has a different connector. I don't have a second M100 right now to test it in, but I am 99.99% positive the LCD is fine) So I purchased a logic prob (Elenco LP-900) to test chip select lines on the LCD connector (Pins 14, 12, 10, 8, 7, 16,15,13,11, 9, and CS1=Pin? - schematics blurry). As I unboxed it I remembered I never used one before. :) - Where do I place the pos and neg alligator clips? - Do I set the logic prob to 400PPS or 00.5PPS? - In checking the chip select lines, am I looking for HI, LO, or PULSE? I see no broken or corroded lines on the board. Thanks in advance. On Wednesday, July 22, 2020, 02:29:39 PM EDT, Jeffrey Birt wrote: This loss of an entire block is the symptom of a missing chip select. When the LCD driver chips are powered/reset they will drive every pixel on/black. When they receive the proper initialization, they will drive every pixel off/clear. It seems the rest and initialization steps are being done so commands are getting through (and the machine is booting so the LCD has to be initializing and responding). Each driver chip on the LCD controls one block of pixels. If an entire block is missing, it is a good sign the chip select is not getting through. It could be a bad trace on the M100, a bad LCD cable or a bad LCD itself. If you have a scope of logic probe you can check to see if all the chip select lines are toggling. Jeff BIrt From: M100 On Behalf Of Chris Fezzler Sent: Wednesday, July 22, 2020 11:26 AM To: m...@bitc
Re: [M100] Listserv Search
Hey Chris, The LCD has 10 actual controller chips. Each one controls 4 lines x 50 pixels. The two completely blank areas on the screen are the exact size of one of the controllers. It looks like either those controllers are not functioning, or the enable signal driving them is not functioning (bad decoder IC, bad trace, bad connector). I can't tell if the others have missing single pixel columns, or if the text is actually missing some letters (i.e. should line 6 actually say "test of the TRS-80" or does it really have spaces instead of text there? Ken On 7/26/20 12:54 PM, Chris Fezzler wrote: No after market ROM. Logically, I would think the fact that the top four lines are perfect, the hard reset produces a perfect Menu screen, and just the bottom four lines are garbled would be a clue where to look. I know nothing other than reading a lot off Internet. My instinct tells me the issue is a component that regulates power or signals to the LCD driver chips for the bottom half of the screen. The are getting power (because we see gibberish and the perfect Menu screen) but perhaps it is the wrong voltage or intermittent power or signal. Thoughts are: Capacitors C47 or C54 and or M17 and/or M25. But I don't know how to determine their impact on the issue. On Sunday, July 26, 2020, 11:25:01 AM EDT, Jeffrey Birt wrote: When comparing your two pictures, after rotating them right side up, I noticed just now that not only do you have blank blocks but some of the characters are reversed. That is really bizarre. I’m not sure if that points to a problem with how the LCD drivers are being configured/initialized or what data is being sent to them. If the driver ships are outputting a built-in font here it might be a chip configuration issue. If the display is always bit mapped, then it would be something else. Do you have any sort of aftermarket ROM installed? Very interesting problem. Jeff Birt *From:* M100 *On Behalf Of *Chris Fezzler *Sent:* Sunday, July 26, 2020 9:47 AM *To:* m...@bitchin100.com *Subject:* Re: [M100] Listserv Search Gladly. On Sunday, July 26, 2020, 08:36:06 AM EDT, Jeffrey Birt mailto:bir...@soigeneris.com>> wrote: Can you attach a picture of the cold boot screen too? The positive and negative clips go to a +5 and ground source on the M100 PCB itself. The PPS setting if ‘Pulses Per Second’ when using it as a logic pulser, i.e. to inject a pulsing signal. On the chip select lines you should she them quickly toggling. Jeff Birt *From:*M100 <mailto:m100-boun...@lists.bitchin100.com>> *On Behalf Of *Chris Fezzler *Sent:* Saturday, July 25, 2020 6:20 PM *To:* m...@bitchin100.com <mailto:m...@bitchin100.com> *Subject:* Re: [M100] Listserv Search *ALERT*: Beginner asking question. *Reminder:*Upon hard reset the LCD initializes perfectly and displays the main Menu screen perfectly. However, once in BASIC or TEXT the bottom four lines do not display correctly. /(See attached.)/ /(Planned to test LCD in M102 but it has a different connector. I don't have a second M100 right now to test it in, but I am 99.99% positive the LCD is fine)/ So I purchased a logic prob (Elenco LP-900) <https://www.jpmsupply.com/Logic-Probe-and-Pulser-Combination-Elenco-LP-900-p/80311.htm> to test chip select lines on the LCD connector (Pins 14, 12, 10, 8, 7, 16,15,13,11, 9, and CS1=Pin? - /schematics blurry/). As I unboxed it I remembered I never used one before. :) - Where do I place the/pos/ and /neg/ alligator clips? - Do I set the logic prob to/400PPS/ or/00.5PPS/? - In checking the chip select lines, am I looking for /HI, LO, or PULSE/? I see no broken or corroded lines on the board. Thanks in advance. On Wednesday, July 22, 2020, 02:29:39 PM EDT, Jeffrey Birt mailto:bir...@soigeneris.com>> wrote: This loss of an entire block is the symptom of a missing chip select. When the LCD driver chips are powered/reset they will drive every pixel on/black. When they receive the proper initialization, they will drive every pixel off/clear. It seems the rest and initialization steps are being done so commands are getting through (and the machine is booting so the LCD has to be initializing and responding). Each driver chip on the LCD controls one block of pixels. If an entire block is missing, it is a good sign the chip select is not getting through. It could be a bad trace on the M100, a bad LCD cable or a bad LCD itself. If you have a scope of logic probe you can check to see if all the chip select lines are toggling. Jeff BIrt *From:*M100 <mailto:m100-boun...@lists.bitchin100.com>> *On Behalf Of *Chris Fezzler *Sent:* Wednesday, July 22, 2020 11:26 AM *To:* m...@bitchin100.com <mailto:m...@bitchin100.com> *Subject:* Re: [M100] Listserv Search Here you go. On Wednesday, July 22, 2020, 11:52:23 AM EDT, Stephen Adolph mailto:twospru...@gmail.com>> wrote: a pi
Re: [M100] Listserv Search
No after market ROM. Logically, I would think the fact that the top four lines are perfect, the hard reset produces a perfect Menu screen, and just the bottom four lines are garbled would be a clue where to look. I know nothing other than reading a lot off Internet. My instinct tells me the issue is a component that regulates power or signals to the LCD driver chips for the bottom half of the screen. The are getting power (because we see gibberish and the perfect Menu screen) but perhaps it is the wrong voltage or intermittent power or signal. Thoughts are: Capacitors C47 or C54 and or M17 and/or M25. But I don't know how to determine their impact on the issue. On Sunday, July 26, 2020, 11:25:01 AM EDT, Jeffrey Birt wrote: When comparing your two pictures, after rotating them right side up, I noticed just now that not only do you have blank blocks but some of the characters are reversed. That is really bizarre. I’m not sure if that points to a problem with how the LCD drivers are being configured/initialized or what data is being sent to them. If the driver ships are outputting a built-in font here it might be a chip configuration issue. If the display is always bit mapped, then it would be something else. Do you have any sort of aftermarket ROM installed? Very interesting problem. Jeff Birt From: M100 On Behalf Of Chris Fezzler Sent: Sunday, July 26, 2020 9:47 AM To: m...@bitchin100.com Subject: Re: [M100] Listserv Search Gladly. On Sunday, July 26, 2020, 08:36:06 AM EDT, Jeffrey Birt wrote: Can you attach a picture of the cold boot screen too? The positive and negative clips go to a +5 and ground source on the M100 PCB itself. The PPS setting if ‘Pulses Per Second’ when using it as a logic pulser, i.e. to inject a pulsing signal. On the chip select lines you should she them quickly toggling. Jeff Birt From: M100 On Behalf Of Chris Fezzler Sent: Saturday, July 25, 2020 6:20 PM To: m...@bitchin100.com Subject: Re: [M100] Listserv Search ALERT: Beginner asking question. Reminder: Upon hard reset the LCD initializes perfectly and displays the main Menu screen perfectly. However, once in BASIC or TEXT the bottom four lines do not display correctly. (See attached.) (Planned to test LCD in M102 but it has a different connector. I don't have a second M100 right now to test it in, but I am 99.99% positive the LCD is fine) So I purchased a logic prob (Elenco LP-900) to test chip select lines on the LCD connector (Pins 14, 12, 10, 8, 7, 16,15,13,11, 9, and CS1=Pin? - schematics blurry). As I unboxed it I remembered I never used one before. :) - Where do I place the pos and neg alligator clips? - Do I set the logic prob to 400PPS or 00.5PPS? - In checking the chip select lines, am I looking for HI, LO, or PULSE? I see no broken or corroded lines on the board. Thanks in advance. On Wednesday, July 22, 2020, 02:29:39 PM EDT, Jeffrey Birt wrote: This loss of an entire block is the symptom of a missing chip select. When the LCD driver chips are powered/reset they will drive every pixel on/black. When they receive the proper initialization, they will drive every pixel off/clear. It seems the rest and initialization steps are being done so commands are getting through (and the machine is booting so the LCD has to be initializing and responding). Each driver chip on the LCD controls one block of pixels. If an entire block is missing, it is a good sign the chip select is not getting through. It could be a bad trace on the M100, a bad LCD cable or a bad LCD itself. If you have a scope of logic probe you can check to see if all the chip select lines are toggling. Jeff BIrt From: M100 On Behalf Of Chris Fezzler Sent: Wednesday, July 22, 2020 11:26 AM To: m...@bitchin100.com Subject: Re: [M100] Listserv Search Here you go. On Wednesday, July 22, 2020, 11:52:23 AM EDT, Stephen Adolph wrote: a pic of the garbled screen would be great if you can do it.. thanks On Wed, Jul 22, 2020 at 11:37 AM Chris Fezzler wrote: Sorry - typing too fast. Top four lines of the screen. Yes, mostly garbage all of the time. Except a hard rest will generate a proper menu screen. Yes, in BASIC the same. But if I type in a test program and hit RUN the program will indeed run. So the computer is getting the commands/keystrokes. Just not displaying bottom four lines. I think it is a component issue. On Wednesday, July 22, 2020, 09:20:53 AM EDT, Stephen Adolph wrote: Hi Chris, What do you mean by "the top 4". Do you mean top 4 lines on the screen? I think so. So is it correct to say that the LCD bottom 4 lines display garbage at certain times * not after a (hard) reset - you get a correct MENU display (not just a RESET but a HARD RESET?) * when you e
Re: [M100] Listserv Search
When comparing your two pictures, after rotating them right side up, I noticed just now that not only do you have blank blocks but some of the characters are reversed. That is really bizarre. I’m not sure if that points to a problem with how the LCD drivers are being configured/initialized or what data is being sent to them. If the driver ships are outputting a built-in font here it might be a chip configuration issue. If the display is always bit mapped, then it would be something else. Do you have any sort of aftermarket ROM installed? Very interesting problem. Jeff Birt From: M100 On Behalf Of Chris Fezzler Sent: Sunday, July 26, 2020 9:47 AM To: m...@bitchin100.com Subject: Re: [M100] Listserv Search Gladly. On Sunday, July 26, 2020, 08:36:06 AM EDT, Jeffrey Birt mailto:bir...@soigeneris.com> > wrote: Can you attach a picture of the cold boot screen too? The positive and negative clips go to a +5 and ground source on the M100 PCB itself. The PPS setting if ‘Pulses Per Second’ when using it as a logic pulser, i.e. to inject a pulsing signal. On the chip select lines you should she them quickly toggling. Jeff Birt From: M100 mailto:m100-boun...@lists.bitchin100.com> > On Behalf Of Chris Fezzler Sent: Saturday, July 25, 2020 6:20 PM To: m...@bitchin100.com <mailto:m...@bitchin100.com> Subject: Re: [M100] Listserv Search ALERT: Beginner asking question. Reminder: Upon hard reset the LCD initializes perfectly and displays the main Menu screen perfectly. However, once in BASIC or TEXT the bottom four lines do not display correctly. (See attached.) (Planned to test LCD in M102 but it has a different connector. I don't have a second M100 right now to test it in, but I am 99.99% positive the LCD is fine) So I purchased a logic prob (Elenco LP-900) <https://www.jpmsupply.com/Logic-Probe-and-Pulser-Combination-Elenco-LP-900-p/80311.htm> to test chip select lines on the LCD connector (Pins 14, 12, 10, 8, 7, 16,15,13,11, 9, and CS1=Pin? - schematics blurry). As I unboxed it I remembered I never used one before. :) - Where do I place the pos and neg alligator clips? - Do I set the logic prob to 400PPS or 00.5PPS? - In checking the chip select lines, am I looking for HI, LO, or PULSE? I see no broken or corroded lines on the board. Thanks in advance. On Wednesday, July 22, 2020, 02:29:39 PM EDT, Jeffrey Birt mailto:bir...@soigeneris.com> > wrote: This loss of an entire block is the symptom of a missing chip select. When the LCD driver chips are powered/reset they will drive every pixel on/black. When they receive the proper initialization, they will drive every pixel off/clear. It seems the rest and initialization steps are being done so commands are getting through (and the machine is booting so the LCD has to be initializing and responding). Each driver chip on the LCD controls one block of pixels. If an entire block is missing, it is a good sign the chip select is not getting through. It could be a bad trace on the M100, a bad LCD cable or a bad LCD itself. If you have a scope of logic probe you can check to see if all the chip select lines are toggling. Jeff BIrt From: M100 mailto:m100-boun...@lists.bitchin100.com> > On Behalf Of Chris Fezzler Sent: Wednesday, July 22, 2020 11:26 AM To: m...@bitchin100.com <mailto:m...@bitchin100.com> Subject: Re: [M100] Listserv Search Here you go. On Wednesday, July 22, 2020, 11:52:23 AM EDT, Stephen Adolph mailto:twospru...@gmail.com> > wrote: a pic of the garbled screen would be great if you can do it.. thanks On Wed, Jul 22, 2020 at 11:37 AM Chris Fezzler mailto:fezz...@yahoo.com> > wrote: Sorry - typing too fast. Top four lines of the screen. Yes, mostly garbage all of the time. Except a hard rest will generate a proper menu screen. Yes, in BASIC the same. But if I type in a test program and hit RUN the program will indeed run. So the computer is getting the commands/keystrokes. Just not displaying bottom four lines. I think it is a component issue. On Wednesday, July 22, 2020, 09:20:53 AM EDT, Stephen Adolph mailto:twospru...@gmail.com> > wrote: Hi Chris, What do you mean by "the top 4". Do you mean top 4 lines on the screen? I think so. So is it correct to say that the LCD bottom 4 lines display garbage at certain times * not after a (hard) reset - you get a correct MENU display (not just a RESET but a HARD RESET?) * when you enter BASIC and/or run any software, the LCD bottom half shows garbage? I would suggest that you run a memory test. I doubt that you have a fundamental problem with the LCD system, nor the keyboard system. good problem! On Wed, Jul 22, 2020 at 9:02 AM Chris Fezzler mailto:fezz...@yahoo.com> > wro
Re: [M100] Listserv Search
Gladly. On Sunday, July 26, 2020, 08:36:06 AM EDT, Jeffrey Birt wrote: Can you attach a picture of the cold boot screen too? The positive and negative clips go to a +5 and ground source on the M100 PCB itself. The PPS setting if ‘Pulses Per Second’ when using it as a logic pulser, i.e. to inject a pulsing signal. On the chip select lines you should she them quickly toggling. Jeff Birt From: M100 On Behalf Of Chris Fezzler Sent: Saturday, July 25, 2020 6:20 PM To: m...@bitchin100.com Subject: Re: [M100] Listserv Search ALERT: Beginner asking question. Reminder: Upon hard reset the LCD initializes perfectly and displays the main Menu screen perfectly. However, once in BASIC or TEXT the bottom four lines do not display correctly. (See attached.) (Planned to test LCD in M102 but it has a different connector. I don't have a second M100 right now to test it in, but I am 99.99% positive the LCD is fine) So I purchased a logic prob (Elenco LP-900) to test chip select lines on the LCD connector (Pins 14, 12, 10, 8, 7, 16,15,13,11, 9, and CS1=Pin? - schematics blurry). As I unboxed it I remembered I never used one before. :) - Where do I place the pos and neg alligator clips? - Do I set the logic prob to 400PPS or 00.5PPS? - In checking the chip select lines, am I looking for HI, LO, or PULSE? I see no broken or corroded lines on the board. Thanks in advance. On Wednesday, July 22, 2020, 02:29:39 PM EDT, Jeffrey Birt wrote: This loss of an entire block is the symptom of a missing chip select. When the LCD driver chips are powered/reset they will drive every pixel on/black. When they receive the proper initialization, they will drive every pixel off/clear. It seems the rest and initialization steps are being done so commands are getting through (and the machine is booting so the LCD has to be initializing and responding). Each driver chip on the LCD controls one block of pixels. If an entire block is missing, it is a good sign the chip select is not getting through. It could be a bad trace on the M100, a bad LCD cable or a bad LCD itself. If you have a scope of logic probe you can check to see if all the chip select lines are toggling. Jeff BIrt From: M100 On Behalf Of Chris Fezzler Sent: Wednesday, July 22, 2020 11:26 AM To: m...@bitchin100.com Subject: Re: [M100] Listserv Search Here you go. On Wednesday, July 22, 2020, 11:52:23 AM EDT, Stephen Adolph wrote: a pic of the garbled screen would be great if you can do it.. thanks On Wed, Jul 22, 2020 at 11:37 AM Chris Fezzler wrote: Sorry - typing too fast. Top four lines of the screen. Yes, mostly garbage all of the time. Except a hard rest will generate a proper menu screen. Yes, in BASIC the same. But if I type in a test program and hit RUN the program will indeed run. So the computer is getting the commands/keystrokes. Just not displaying bottom four lines. I think it is a component issue. On Wednesday, July 22, 2020, 09:20:53 AM EDT, Stephen Adolph wrote: Hi Chris, What do you mean by "the top 4". Do you mean top 4 lines on the screen? I think so. So is it correct to say that the LCD bottom 4 lines display garbage at certain times * not after a (hard) reset - you get a correct MENU display (not just a RESET but a HARD RESET?) * when you enter BASIC and/or run any software, the LCD bottom half shows garbage? I would suggest that you run a memory test. I doubt that you have a fundamental problem with the LCD system, nor the keyboard system. good problem! On Wed, Jul 22, 2020 at 9:02 AM Chris Fezzler wrote: I'm trying to troubleshoot what components on the circuit board process keystrokes and send them to the screen. The screen and keyboard on my Model 100 are in perfect working order. But only the top four are processing correctly. The bottom four are displaying gibberish. But if I type commands in BASIC, they work. So again, not the keyboard or screen but components that process the bottom half. A hard rest will present a perfect menu screen. But upon entering an app, the bottom four lines are not getting proper signal. Sorry, I'm not an electronics or computer engineer. Just a hobbyist with a soldering iron and a willingness to learn. Plan to look at Technical Reference Manual to see if I can troubleshoot. On Wednesday, July 22, 2020, 01:15:25 AM EDT, John R. Hogerhuis wrote: On Tue, Jul 21, 2020 at 5:08 PM Chris Fezzler wrote: Is there a way to search old Listserv messages so I can research before embarrass...err...I mean ask a dumb question. Seriously, would like to research. How old are we talking? Gmane was our archive until it went down for a long time. Then it was back up recently but only accessible through nn
Re: [M100] Listserv Search
Can you attach a picture of the cold boot screen too? The positive and negative clips go to a +5 and ground source on the M100 PCB itself. The PPS setting if ‘Pulses Per Second’ when using it as a logic pulser, i.e. to inject a pulsing signal. On the chip select lines you should she them quickly toggling. Jeff Birt From: M100 On Behalf Of Chris Fezzler Sent: Saturday, July 25, 2020 6:20 PM To: m...@bitchin100.com Subject: Re: [M100] Listserv Search ALERT: Beginner asking question. Reminder: Upon hard reset the LCD initializes perfectly and displays the main Menu screen perfectly. However, once in BASIC or TEXT the bottom four lines do not display correctly. (See attached.) (Planned to test LCD in M102 but it has a different connector. I don't have a second M100 right now to test it in, but I am 99.99% positive the LCD is fine) So I purchased a logic prob (Elenco LP-900) <https://www.jpmsupply.com/Logic-Probe-and-Pulser-Combination-Elenco-LP-900-p/80311.htm> to test chip select lines on the LCD connector (Pins 14, 12, 10, 8, 7, 16,15,13,11, 9, and CS1=Pin? - schematics blurry). As I unboxed it I remembered I never used one before. :) - Where do I place the pos and neg alligator clips? - Do I set the logic prob to 400PPS or 00.5PPS? - In checking the chip select lines, am I looking for HI, LO, or PULSE? I see no broken or corroded lines on the board. Thanks in advance. On Wednesday, July 22, 2020, 02:29:39 PM EDT, Jeffrey Birt mailto:bir...@soigeneris.com> > wrote: This loss of an entire block is the symptom of a missing chip select. When the LCD driver chips are powered/reset they will drive every pixel on/black. When they receive the proper initialization, they will drive every pixel off/clear. It seems the rest and initialization steps are being done so commands are getting through (and the machine is booting so the LCD has to be initializing and responding). Each driver chip on the LCD controls one block of pixels. If an entire block is missing, it is a good sign the chip select is not getting through. It could be a bad trace on the M100, a bad LCD cable or a bad LCD itself. If you have a scope of logic probe you can check to see if all the chip select lines are toggling. Jeff BIrt From: M100 mailto:m100-boun...@lists.bitchin100.com> > On Behalf Of Chris Fezzler Sent: Wednesday, July 22, 2020 11:26 AM To: m...@bitchin100.com <mailto:m...@bitchin100.com> Subject: Re: [M100] Listserv Search Here you go. On Wednesday, July 22, 2020, 11:52:23 AM EDT, Stephen Adolph mailto:twospru...@gmail.com> > wrote: a pic of the garbled screen would be great if you can do it.. thanks On Wed, Jul 22, 2020 at 11:37 AM Chris Fezzler mailto:fezz...@yahoo.com> > wrote: Sorry - typing too fast. Top four lines of the screen. Yes, mostly garbage all of the time. Except a hard rest will generate a proper menu screen. Yes, in BASIC the same. But if I type in a test program and hit RUN the program will indeed run. So the computer is getting the commands/keystrokes. Just not displaying bottom four lines. I think it is a component issue. On Wednesday, July 22, 2020, 09:20:53 AM EDT, Stephen Adolph mailto:twospru...@gmail.com> > wrote: Hi Chris, What do you mean by "the top 4". Do you mean top 4 lines on the screen? I think so. So is it correct to say that the LCD bottom 4 lines display garbage at certain times * not after a (hard) reset - you get a correct MENU display (not just a RESET but a HARD RESET?) * when you enter BASIC and/or run any software, the LCD bottom half shows garbage? I would suggest that you run a memory test. I doubt that you have a fundamental problem with the LCD system, nor the keyboard system. good problem! On Wed, Jul 22, 2020 at 9:02 AM Chris Fezzler mailto:fezz...@yahoo.com> > wrote: I'm trying to troubleshoot what components on the circuit board process keystrokes and send them to the screen. The screen and keyboard on my Model 100 are in perfect working order. But only the top four are processing correctly. The bottom four are displaying gibberish. But if I type commands in BASIC, they work. So again, not the keyboard or screen but components that process the bottom half. A hard rest will present a perfect menu screen. But upon entering an app, the bottom four lines are not getting proper signal. Sorry, I'm not an electronics or computer engineer. Just a hobbyist with a soldering iron and a willingness to learn. Plan to look at Technical Reference Manual to see if I can troubleshoot. On Wednesday, July 22, 2020, 01:15:25 AM EDT, John R. Hogerhuis mailto:jho...@pobox.com> > wrote: On Tue, Jul 21, 2020 at 5:08 PM Chris Fezzler mailto:fezz...@yahoo.com> > wrote: I
Re: [M100] Listserv Search
ALERT: Beginner asking question. Reminder: Upon hard reset the LCD initializes perfectly and displays the main Menu screen perfectly. However, once in BASIC or TEXT the bottom four lines do not display correctly. (See attached.) (Planned to test LCD in M102 but it has a different connector. I don't have a second M100 right now to test it in, but I am 99.99% positive the LCD is fine) So I purchased a logic prob (Elenco LP-900) to test chip select lines on the LCD connector (Pins 14, 12, 10, 8, 7, 16,15,13,11, 9, and CS1=Pin? - schematics blurry).As I unboxed it I remembered I never used one before. :) - Where do I place the pos and neg alligator clips? - Do I set the logic prob to 400PPS or 00.5PPS? - In checking the chip select lines, am I looking for HI, LO, or PULSE? I see no broken or corroded lines on the board. Thanks in advance. On Wednesday, July 22, 2020, 02:29:39 PM EDT, Jeffrey Birt wrote: This loss of an entire block is the symptom of a missing chip select. When the LCD driver chips are powered/reset they will drive every pixel on/black. When they receive the proper initialization, they will drive every pixel off/clear. It seems the rest and initialization steps are being done so commands are getting through (and the machine is booting so the LCD has to be initializing and responding). Each driver chip on the LCD controls one block of pixels. If an entire block is missing, it is a good sign the chip select is not getting through. It could be a bad trace on the M100, a bad LCD cable or a bad LCD itself. If you have a scope of logic probe you can check to see if all the chip select lines are toggling. Jeff BIrt From: M100 On Behalf Of Chris Fezzler Sent: Wednesday, July 22, 2020 11:26 AM To: m...@bitchin100.com Subject: Re: [M100] Listserv Search Here you go. On Wednesday, July 22, 2020, 11:52:23 AM EDT, Stephen Adolph wrote: a pic of the garbled screen would be great if you can do it.. thanks On Wed, Jul 22, 2020 at 11:37 AM Chris Fezzler wrote: Sorry - typing too fast. Top four lines of the screen. Yes, mostly garbage all of the time. Except a hard rest will generate a proper menu screen. Yes, in BASIC the same. But if I type in a test program and hit RUN the program will indeed run. So the computer is getting the commands/keystrokes. Just not displaying bottom four lines. I think it is a component issue. On Wednesday, July 22, 2020, 09:20:53 AM EDT, Stephen Adolph wrote: Hi Chris, What do you mean by "the top 4". Do you mean top 4 lines on the screen? I think so. So is it correct to say that the LCD bottom 4 lines display garbage at certain times * not after a (hard) reset - you get a correct MENU display (not just a RESET but a HARD RESET?) * when you enter BASIC and/or run any software, the LCD bottom half shows garbage? I would suggest that you run a memory test. I doubt that you have a fundamental problem with the LCD system, nor the keyboard system. good problem! On Wed, Jul 22, 2020 at 9:02 AM Chris Fezzler wrote: I'm trying to troubleshoot what components on the circuit board process keystrokes and send them to the screen. The screen and keyboard on my Model 100 are in perfect working order. But only the top four are processing correctly. The bottom four are displaying gibberish. But if I type commands in BASIC, they work. So again, not the keyboard or screen but components that process the bottom half. A hard rest will present a perfect menu screen. But upon entering an app, the bottom four lines are not getting proper signal. Sorry, I'm not an electronics or computer engineer. Just a hobbyist with a soldering iron and a willingness to learn. Plan to look at Technical Reference Manual to see if I can troubleshoot. On Wednesday, July 22, 2020, 01:15:25 AM EDT, John R. Hogerhuis wrote: On Tue, Jul 21, 2020 at 5:08 PM Chris Fezzler wrote: Is there a way to search old Listserv messages so I can research before embarrass...err...I mean ask a dumb question. Seriously, would like to research. How old are we talking? Gmane was our archive until it went down for a long time. Then it was back up recently but only accessible through nntp readers. Not sure the status of that. Our GNU Mailman list itself has an archive which goes back to 2011 when I took over running the list. http://lists.bitchin100.com/private.cgi/m100-bitchin100.com/ Or just ask. We Are The Archive. -- John.
Re: [M100] Listserv Search
Great clues. Thanks. On Wednesday, July 22, 2020, 02:29:39 PM EDT, Jeffrey Birt wrote: This loss of an entire block is the symptom of a missing chip select. When the LCD driver chips are powered/reset they will drive every pixel on/black. When they receive the proper initialization, they will drive every pixel off/clear. It seems the rest and initialization steps are being done so commands are getting through (and the machine is booting so the LCD has to be initializing and responding). Each driver chip on the LCD controls one block of pixels. If an entire block is missing, it is a good sign the chip select is not getting through. It could be a bad trace on the M100, a bad LCD cable or a bad LCD itself. If you have a scope of logic probe you can check to see if all the chip select lines are toggling. Jeff BIrt From: M100 On Behalf Of Chris Fezzler Sent: Wednesday, July 22, 2020 11:26 AM To: m...@bitchin100.com Subject: Re: [M100] Listserv Search Here you go. On Wednesday, July 22, 2020, 11:52:23 AM EDT, Stephen Adolph wrote: a pic of the garbled screen would be great if you can do it.. thanks On Wed, Jul 22, 2020 at 11:37 AM Chris Fezzler wrote: Sorry - typing too fast. Top four lines of the screen. Yes, mostly garbage all of the time. Except a hard rest will generate a proper menu screen. Yes, in BASIC the same. But if I type in a test program and hit RUN the program will indeed run. So the computer is getting the commands/keystrokes. Just not displaying bottom four lines. I think it is a component issue. On Wednesday, July 22, 2020, 09:20:53 AM EDT, Stephen Adolph wrote: Hi Chris, What do you mean by "the top 4". Do you mean top 4 lines on the screen? I think so. So is it correct to say that the LCD bottom 4 lines display garbage at certain times * not after a (hard) reset - you get a correct MENU display (not just a RESET but a HARD RESET?) * when you enter BASIC and/or run any software, the LCD bottom half shows garbage? I would suggest that you run a memory test. I doubt that you have a fundamental problem with the LCD system, nor the keyboard system. good problem! On Wed, Jul 22, 2020 at 9:02 AM Chris Fezzler wrote: I'm trying to troubleshoot what components on the circuit board process keystrokes and send them to the screen. The screen and keyboard on my Model 100 are in perfect working order. But only the top four are processing correctly. The bottom four are displaying gibberish. But if I type commands in BASIC, they work. So again, not the keyboard or screen but components that process the bottom half. A hard rest will present a perfect menu screen. But upon entering an app, the bottom four lines are not getting proper signal. Sorry, I'm not an electronics or computer engineer. Just a hobbyist with a soldering iron and a willingness to learn. Plan to look at Technical Reference Manual to see if I can troubleshoot. On Wednesday, July 22, 2020, 01:15:25 AM EDT, John R. Hogerhuis wrote: On Tue, Jul 21, 2020 at 5:08 PM Chris Fezzler wrote: Is there a way to search old Listserv messages so I can research before embarrass...err...I mean ask a dumb question. Seriously, would like to research. How old are we talking? Gmane was our archive until it went down for a long time. Then it was back up recently but only accessible through nntp readers. Not sure the status of that. Our GNU Mailman list itself has an archive which goes back to 2011 when I took over running the list. http://lists.bitchin100.com/private.cgi/m100-bitchin100.com/ Or just ask. We Are The Archive. -- John.
Re: [M100] Listserv Search
This loss of an entire block is the symptom of a missing chip select. When the LCD driver chips are powered/reset they will drive every pixel on/black. When they receive the proper initialization, they will drive every pixel off/clear. It seems the rest and initialization steps are being done so commands are getting through (and the machine is booting so the LCD has to be initializing and responding). Each driver chip on the LCD controls one block of pixels. If an entire block is missing, it is a good sign the chip select is not getting through. It could be a bad trace on the M100, a bad LCD cable or a bad LCD itself. If you have a scope of logic probe you can check to see if all the chip select lines are toggling. Jeff BIrt From: M100 On Behalf Of Chris Fezzler Sent: Wednesday, July 22, 2020 11:26 AM To: m...@bitchin100.com Subject: Re: [M100] Listserv Search Here you go. On Wednesday, July 22, 2020, 11:52:23 AM EDT, Stephen Adolph mailto:twospru...@gmail.com> > wrote: a pic of the garbled screen would be great if you can do it.. thanks On Wed, Jul 22, 2020 at 11:37 AM Chris Fezzler mailto:fezz...@yahoo.com> > wrote: Sorry - typing too fast. Top four lines of the screen. Yes, mostly garbage all of the time. Except a hard rest will generate a proper menu screen. Yes, in BASIC the same. But if I type in a test program and hit RUN the program will indeed run. So the computer is getting the commands/keystrokes. Just not displaying bottom four lines. I think it is a component issue. On Wednesday, July 22, 2020, 09:20:53 AM EDT, Stephen Adolph mailto:twospru...@gmail.com> > wrote: Hi Chris, What do you mean by "the top 4". Do you mean top 4 lines on the screen? I think so. So is it correct to say that the LCD bottom 4 lines display garbage at certain times * not after a (hard) reset - you get a correct MENU display (not just a RESET but a HARD RESET?) * when you enter BASIC and/or run any software, the LCD bottom half shows garbage? I would suggest that you run a memory test. I doubt that you have a fundamental problem with the LCD system, nor the keyboard system. good problem! On Wed, Jul 22, 2020 at 9:02 AM Chris Fezzler mailto:fezz...@yahoo.com> > wrote: I'm trying to troubleshoot what components on the circuit board process keystrokes and send them to the screen. The screen and keyboard on my Model 100 are in perfect working order. But only the top four are processing correctly. The bottom four are displaying gibberish. But if I type commands in BASIC, they work. So again, not the keyboard or screen but components that process the bottom half. A hard rest will present a perfect menu screen. But upon entering an app, the bottom four lines are not getting proper signal. Sorry, I'm not an electronics or computer engineer. Just a hobbyist with a soldering iron and a willingness to learn. Plan to look at Technical Reference Manual to see if I can troubleshoot. On Wednesday, July 22, 2020, 01:15:25 AM EDT, John R. Hogerhuis mailto:jho...@pobox.com> > wrote: On Tue, Jul 21, 2020 at 5:08 PM Chris Fezzler mailto:fezz...@yahoo.com> > wrote: Is there a way to search old Listserv messages so I can research before embarrass...err...I mean ask a dumb question. Seriously, would like to research. How old are we talking? Gmane was our archive until it went down for a long time. Then it was back up recently but only accessible through nntp readers. Not sure the status of that. Our GNU Mailman list itself has an archive which goes back to 2011 when I took over running the list. http://lists.bitchin100.com/private.cgi/m100-bitchin100.com/ Or just ask. We Are The Archive. -- John.
Re: [M100] Listserv Search
Will do. On Wednesday, July 22, 2020, 01:21:58 PM EDT, Josh Malone wrote: So, I think I'm seeing entire controllers out (the empty square sections). But if, as you say, the MENU screen works properly, then I would assume that some communications is just slightly out-of-spec for the chips. My first suspect would be failing capacitors - but there are no electrolytics on the LCD PCB. Perhaps corrosion on the LCD PCB is creating a high-impedance short somewhere? Have you inspected the unit for corrosion or other damage? -Josh On Wed, Jul 22, 2020 at 1:17 PM Stephen Adolph wrote: If you have a second M100, it would be interesting to see if the problem follows the LCD. So, move the entire Top half of the M100 to a second machine and see if the problem goes with the top half. On Wed, Jul 22, 2020 at 1:15 PM Stephen Adolph wrote: ok this is quite interesting. I'm not sure what to make of that. And you are sure there is no problem with the "hard reset MENU' screen. On Wed, Jul 22, 2020 at 12:26 PM Chris Fezzler wrote: Here you go. On Wednesday, July 22, 2020, 11:52:23 AM EDT, Stephen Adolph wrote: a pic of the garbled screen would be great if you can do it.. thanks On Wed, Jul 22, 2020 at 11:37 AM Chris Fezzler wrote: Sorry - typing too fast. Top four lines of the screen. Yes, mostly garbage all of the time. Except a hard rest will generate a proper menu screen.Yes, in BASIC the same. But if I type in a test program and hit RUN the program will indeed run.So the computer is getting the commands/keystrokes. Just not displaying bottom four lines. I think it is a component issue. On Wednesday, July 22, 2020, 09:20:53 AM EDT, Stephen Adolph wrote: Hi Chris, What do you mean by "the top 4". Do you mean top 4 lines on the screen? I think so. So is it correct to say that the LCD bottom 4 lines display garbage at certain times* not after a (hard) reset - you get a correct MENU display (not just a RESET but a HARD RESET?)* when you enter BASIC and/or run any software, the LCD bottom half shows garbage? I would suggest that you run a memory test.I doubt that you have a fundamental problem with the LCD system, nor the keyboard system. good problem! On Wed, Jul 22, 2020 at 9:02 AM Chris Fezzler wrote: I'm trying to troubleshoot what components on the circuit board process keystrokes and send them to the screen. The screen and keyboard on my Model 100 are in perfect working order. But only the top four are processing correctly. The bottom four are displaying gibberish. But if I type commands in BASIC, they work. So again, not the keyboard orscreen but components that process the bottom half. A hard rest will present a perfect menu screen. But upon entering an app, the bottom four lines are not getting proper signal. Sorry, I'm not an electronics or computer engineer. Just a hobbyist with a soldering iron and a willingness to learn.Plan to look at Technical Reference Manual to see if I can troubleshoot. On Wednesday, July 22, 2020, 01:15:25 AM EDT, John R. Hogerhuis wrote: On Tue, Jul 21, 2020 at 5:08 PM Chris Fezzler wrote: Is there a way to search old Listserv messages so I can research before embarrass...err...I mean ask a dumb question. Seriously, would like to research. How old are we talking? Gmane was our archive until it went down for a long time. Then it was back up recently but only accessible through nntp readers. Not sure the status of that. Our GNU Mailman list itself has an archive which goes back to 2011 when I took over running the list. http://lists.bitchin100.com/private.cgi/m100-bitchin100.com/ Or just ask. We Are The Archive. -- John.
Re: [M100] Listserv Search
Can do. On Wednesday, July 22, 2020, 01:17:48 PM EDT, Stephen Adolph wrote: If you have a second M100, it would be interesting to see if the problem follows the LCD. So, move the entire Top half of the M100 to a second machine and see if the problem goes with the top half. On Wed, Jul 22, 2020 at 1:15 PM Stephen Adolph wrote: ok this is quite interesting. I'm not sure what to make of that. And you are sure there is no problem with the "hard reset MENU' screen. On Wed, Jul 22, 2020 at 12:26 PM Chris Fezzler wrote: Here you go. On Wednesday, July 22, 2020, 11:52:23 AM EDT, Stephen Adolph wrote: a pic of the garbled screen would be great if you can do it.. thanks On Wed, Jul 22, 2020 at 11:37 AM Chris Fezzler wrote: Sorry - typing too fast. Top four lines of the screen. Yes, mostly garbage all of the time. Except a hard rest will generate a proper menu screen.Yes, in BASIC the same. But if I type in a test program and hit RUN the program will indeed run.So the computer is getting the commands/keystrokes. Just not displaying bottom four lines. I think it is a component issue. On Wednesday, July 22, 2020, 09:20:53 AM EDT, Stephen Adolph wrote: Hi Chris, What do you mean by "the top 4". Do you mean top 4 lines on the screen? I think so. So is it correct to say that the LCD bottom 4 lines display garbage at certain times* not after a (hard) reset - you get a correct MENU display (not just a RESET but a HARD RESET?)* when you enter BASIC and/or run any software, the LCD bottom half shows garbage? I would suggest that you run a memory test.I doubt that you have a fundamental problem with the LCD system, nor the keyboard system. good problem! On Wed, Jul 22, 2020 at 9:02 AM Chris Fezzler wrote: I'm trying to troubleshoot what components on the circuit board process keystrokes and send them to the screen. The screen and keyboard on my Model 100 are in perfect working order. But only the top four are processing correctly. The bottom four are displaying gibberish. But if I type commands in BASIC, they work. So again, not the keyboard orscreen but components that process the bottom half. A hard rest will present a perfect menu screen. But upon entering an app, the bottom four lines are not getting proper signal. Sorry, I'm not an electronics or computer engineer. Just a hobbyist with a soldering iron and a willingness to learn.Plan to look at Technical Reference Manual to see if I can troubleshoot. On Wednesday, July 22, 2020, 01:15:25 AM EDT, John R. Hogerhuis wrote: On Tue, Jul 21, 2020 at 5:08 PM Chris Fezzler wrote: Is there a way to search old Listserv messages so I can research before embarrass...err...I mean ask a dumb question. Seriously, would like to research. How old are we talking? Gmane was our archive until it went down for a long time. Then it was back up recently but only accessible through nntp readers. Not sure the status of that. Our GNU Mailman list itself has an archive which goes back to 2011 when I took over running the list. http://lists.bitchin100.com/private.cgi/m100-bitchin100.com/ Or just ask. We Are The Archive. -- John.
Re: [M100] Listserv Search
So, I think I'm seeing entire controllers out (the empty square sections). But if, as you say, the MENU screen works properly, then I would assume that some communications is just slightly out-of-spec for the chips. My first suspect would be failing capacitors - but there are no electrolytics on the LCD PCB. Perhaps corrosion on the LCD PCB is creating a high-impedance short somewhere? Have you inspected the unit for corrosion or other damage? -Josh On Wed, Jul 22, 2020 at 1:17 PM Stephen Adolph wrote: > If you have a second M100, it would be interesting to see if the problem > follows the LCD. So, move the entire Top half of the M100 to a second > machine and see if the problem goes with the top half. > > > On Wed, Jul 22, 2020 at 1:15 PM Stephen Adolph > wrote: > >> ok this is quite interesting. I'm not sure what to make of that. And >> you are sure there is no problem with the "hard reset MENU' screen. >> >> On Wed, Jul 22, 2020 at 12:26 PM Chris Fezzler wrote: >> >>> Here you go. >>> >>> >>> >>> On Wednesday, July 22, 2020, 11:52:23 AM EDT, Stephen Adolph < >>> twospru...@gmail.com> wrote: >>> >>> >>> a pic of the garbled screen would be great if you can do it.. thanks >>> >>> On Wed, Jul 22, 2020 at 11:37 AM Chris Fezzler >>> wrote: >>> >>> Sorry - typing too fast. Top four lines of the screen. >>> >>> Yes, mostly garbage all of the time. Except a hard rest will generate a >>> proper menu screen. >>> Yes, in BASIC the same. But if I type in a test program and hit RUN the >>> program will indeed run. >>> So the computer is getting the commands/keystrokes. Just not displaying >>> bottom four lines. >>> >>> I think it is a component issue. >>> >>> >>> On Wednesday, July 22, 2020, 09:20:53 AM EDT, Stephen Adolph < >>> twospru...@gmail.com> wrote: >>> >>> >>> Hi Chris, >>> >>> What do you mean by "the top 4". Do you mean top 4 lines on the >>> screen? I think so. >>> >>> So is it correct to say that the LCD bottom 4 lines display garbage at >>> certain times >>> * not after a (hard) reset - you get a correct MENU display (not just a >>> RESET but a HARD RESET?) >>> * when you enter BASIC and/or run any software, the LCD bottom half >>> shows garbage? >>> >>> I would suggest that you run a memory test. >>> I doubt that you have a fundamental problem with the LCD system, nor the >>> keyboard system. >>> >>> good problem! >>> >>> >>> >>> On Wed, Jul 22, 2020 at 9:02 AM Chris Fezzler wrote: >>> >>> I'm trying to troubleshoot what components on the circuit board process >>> keystrokes and send them to the screen. >>> >>> The screen and keyboard on my Model 100 are in perfect working order. >>> But only the top four are processing correctly. >>> >>> The bottom four are displaying gibberish. But if I type commands in >>> BASIC, they work. So again, not the keyboard or >>> screen but components that process the bottom half. A hard rest will >>> present a perfect menu screen. But upon entering >>> an app, the bottom four lines are not getting proper signal. >>> >>> Sorry, I'm not an electronics or computer engineer. Just a hobbyist >>> with a soldering iron and a willingness to learn. >>> Plan to look at Technical Reference Manual to see if I can troubleshoot. >>> >>> On Wednesday, July 22, 2020, 01:15:25 AM EDT, John R. Hogerhuis < >>> jho...@pobox.com> wrote: >>> >>> >>> >>> >>> On Tue, Jul 21, 2020 at 5:08 PM Chris Fezzler wrote: >>> >>> Is there a way to search old Listserv messages so I can research before >>> embarrass...err...I mean ask a dumb question. >>> >>> Seriously, would like to research. >>> >>> >>> >>> How old are we talking? >>> >>> Gmane was our archive until it went down for a long time. Then it was >>> back up recently but only accessible through nntp readers. Not sure >>> the status of that. >>> >>> Our GNU Mailman list itself has an archive which goes back to 2011 when >>> I took over running the list. >>> >>> http://lists.bitchin100.com/private.cgi/m100-bitchin100.com/ >>> >>> Or just ask. We Are The Archive. >>> >>> -- John. >>> >>>
Re: [M100] Listserv Search
If you have a second M100, it would be interesting to see if the problem follows the LCD. So, move the entire Top half of the M100 to a second machine and see if the problem goes with the top half. On Wed, Jul 22, 2020 at 1:15 PM Stephen Adolph wrote: > ok this is quite interesting. I'm not sure what to make of that. And you > are sure there is no problem with the "hard reset MENU' screen. > > On Wed, Jul 22, 2020 at 12:26 PM Chris Fezzler wrote: > >> Here you go. >> >> >> >> On Wednesday, July 22, 2020, 11:52:23 AM EDT, Stephen Adolph < >> twospru...@gmail.com> wrote: >> >> >> a pic of the garbled screen would be great if you can do it.. thanks >> >> On Wed, Jul 22, 2020 at 11:37 AM Chris Fezzler wrote: >> >> Sorry - typing too fast. Top four lines of the screen. >> >> Yes, mostly garbage all of the time. Except a hard rest will generate a >> proper menu screen. >> Yes, in BASIC the same. But if I type in a test program and hit RUN the >> program will indeed run. >> So the computer is getting the commands/keystrokes. Just not displaying >> bottom four lines. >> >> I think it is a component issue. >> >> >> On Wednesday, July 22, 2020, 09:20:53 AM EDT, Stephen Adolph < >> twospru...@gmail.com> wrote: >> >> >> Hi Chris, >> >> What do you mean by "the top 4". Do you mean top 4 lines on the screen? >> I think so. >> >> So is it correct to say that the LCD bottom 4 lines display garbage at >> certain times >> * not after a (hard) reset - you get a correct MENU display (not just a >> RESET but a HARD RESET?) >> * when you enter BASIC and/or run any software, the LCD bottom half shows >> garbage? >> >> I would suggest that you run a memory test. >> I doubt that you have a fundamental problem with the LCD system, nor the >> keyboard system. >> >> good problem! >> >> >> >> On Wed, Jul 22, 2020 at 9:02 AM Chris Fezzler wrote: >> >> I'm trying to troubleshoot what components on the circuit board process >> keystrokes and send them to the screen. >> >> The screen and keyboard on my Model 100 are in perfect working order. >> But only the top four are processing correctly. >> >> The bottom four are displaying gibberish. But if I type commands in >> BASIC, they work. So again, not the keyboard or >> screen but components that process the bottom half. A hard rest will >> present a perfect menu screen. But upon entering >> an app, the bottom four lines are not getting proper signal. >> >> Sorry, I'm not an electronics or computer engineer. Just a hobbyist with >> a soldering iron and a willingness to learn. >> Plan to look at Technical Reference Manual to see if I can troubleshoot. >> >> On Wednesday, July 22, 2020, 01:15:25 AM EDT, John R. Hogerhuis < >> jho...@pobox.com> wrote: >> >> >> >> >> On Tue, Jul 21, 2020 at 5:08 PM Chris Fezzler wrote: >> >> Is there a way to search old Listserv messages so I can research before >> embarrass...err...I mean ask a dumb question. >> >> Seriously, would like to research. >> >> >> >> How old are we talking? >> >> Gmane was our archive until it went down for a long time. Then it was >> back up recently but only accessible through nntp readers. Not sure >> the status of that. >> >> Our GNU Mailman list itself has an archive which goes back to 2011 when I >> took over running the list. >> >> http://lists.bitchin100.com/private.cgi/m100-bitchin100.com/ >> >> Or just ask. We Are The Archive. >> >> -- John. >> >>
Re: [M100] Listserv Search
ok this is quite interesting. I'm not sure what to make of that. And you are sure there is no problem with the "hard reset MENU' screen. On Wed, Jul 22, 2020 at 12:26 PM Chris Fezzler wrote: > Here you go. > > > > On Wednesday, July 22, 2020, 11:52:23 AM EDT, Stephen Adolph < > twospru...@gmail.com> wrote: > > > a pic of the garbled screen would be great if you can do it.. thanks > > On Wed, Jul 22, 2020 at 11:37 AM Chris Fezzler wrote: > > Sorry - typing too fast. Top four lines of the screen. > > Yes, mostly garbage all of the time. Except a hard rest will generate a > proper menu screen. > Yes, in BASIC the same. But if I type in a test program and hit RUN the > program will indeed run. > So the computer is getting the commands/keystrokes. Just not displaying > bottom four lines. > > I think it is a component issue. > > > On Wednesday, July 22, 2020, 09:20:53 AM EDT, Stephen Adolph < > twospru...@gmail.com> wrote: > > > Hi Chris, > > What do you mean by "the top 4". Do you mean top 4 lines on the screen? > I think so. > > So is it correct to say that the LCD bottom 4 lines display garbage at > certain times > * not after a (hard) reset - you get a correct MENU display (not just a > RESET but a HARD RESET?) > * when you enter BASIC and/or run any software, the LCD bottom half shows > garbage? > > I would suggest that you run a memory test. > I doubt that you have a fundamental problem with the LCD system, nor the > keyboard system. > > good problem! > > > > On Wed, Jul 22, 2020 at 9:02 AM Chris Fezzler wrote: > > I'm trying to troubleshoot what components on the circuit board process > keystrokes and send them to the screen. > > The screen and keyboard on my Model 100 are in perfect working order. But > only the top four are processing correctly. > > The bottom four are displaying gibberish. But if I type commands in > BASIC, they work. So again, not the keyboard or > screen but components that process the bottom half. A hard rest will > present a perfect menu screen. But upon entering > an app, the bottom four lines are not getting proper signal. > > Sorry, I'm not an electronics or computer engineer. Just a hobbyist with > a soldering iron and a willingness to learn. > Plan to look at Technical Reference Manual to see if I can troubleshoot. > > On Wednesday, July 22, 2020, 01:15:25 AM EDT, John R. Hogerhuis < > jho...@pobox.com> wrote: > > > > > On Tue, Jul 21, 2020 at 5:08 PM Chris Fezzler wrote: > > Is there a way to search old Listserv messages so I can research before > embarrass...err...I mean ask a dumb question. > > Seriously, would like to research. > > > > How old are we talking? > > Gmane was our archive until it went down for a long time. Then it was back > up recently but only accessible through nntp readers. Not sure the status > of that. > > Our GNU Mailman list itself has an archive which goes back to 2011 when I > took over running the list. > > http://lists.bitchin100.com/private.cgi/m100-bitchin100.com/ > > Or just ask. We Are The Archive. > > -- John. > >
Re: [M100] Listserv Search
Here you go. On Wednesday, July 22, 2020, 11:52:23 AM EDT, Stephen Adolph wrote: a pic of the garbled screen would be great if you can do it.. thanks On Wed, Jul 22, 2020 at 11:37 AM Chris Fezzler wrote: Sorry - typing too fast. Top four lines of the screen. Yes, mostly garbage all of the time. Except a hard rest will generate a proper menu screen.Yes, in BASIC the same. But if I type in a test program and hit RUN the program will indeed run.So the computer is getting the commands/keystrokes. Just not displaying bottom four lines. I think it is a component issue. On Wednesday, July 22, 2020, 09:20:53 AM EDT, Stephen Adolph wrote: Hi Chris, What do you mean by "the top 4". Do you mean top 4 lines on the screen? I think so. So is it correct to say that the LCD bottom 4 lines display garbage at certain times* not after a (hard) reset - you get a correct MENU display (not just a RESET but a HARD RESET?)* when you enter BASIC and/or run any software, the LCD bottom half shows garbage? I would suggest that you run a memory test.I doubt that you have a fundamental problem with the LCD system, nor the keyboard system. good problem! On Wed, Jul 22, 2020 at 9:02 AM Chris Fezzler wrote: I'm trying to troubleshoot what components on the circuit board process keystrokes and send them to the screen. The screen and keyboard on my Model 100 are in perfect working order. But only the top four are processing correctly. The bottom four are displaying gibberish. But if I type commands in BASIC, they work. So again, not the keyboard orscreen but components that process the bottom half. A hard rest will present a perfect menu screen. But upon entering an app, the bottom four lines are not getting proper signal. Sorry, I'm not an electronics or computer engineer. Just a hobbyist with a soldering iron and a willingness to learn.Plan to look at Technical Reference Manual to see if I can troubleshoot. On Wednesday, July 22, 2020, 01:15:25 AM EDT, John R. Hogerhuis wrote: On Tue, Jul 21, 2020 at 5:08 PM Chris Fezzler wrote: Is there a way to search old Listserv messages so I can research before embarrass...err...I mean ask a dumb question. Seriously, would like to research. How old are we talking? Gmane was our archive until it went down for a long time. Then it was back up recently but only accessible through nntp readers. Not sure the status of that. Our GNU Mailman list itself has an archive which goes back to 2011 when I took over running the list. http://lists.bitchin100.com/private.cgi/m100-bitchin100.com/ Or just ask. We Are The Archive. -- John.
Re: [M100] Listserv Search
a pic of the garbled screen would be great if you can do it.. thanks On Wed, Jul 22, 2020 at 11:37 AM Chris Fezzler wrote: > Sorry - typing too fast. Top four lines of the screen. > > Yes, mostly garbage all of the time. Except a hard rest will generate a > proper menu screen. > Yes, in BASIC the same. But if I type in a test program and hit RUN the > program will indeed run. > So the computer is getting the commands/keystrokes. Just not displaying > bottom four lines. > > I think it is a component issue. > > > On Wednesday, July 22, 2020, 09:20:53 AM EDT, Stephen Adolph < > twospru...@gmail.com> wrote: > > > Hi Chris, > > What do you mean by "the top 4". Do you mean top 4 lines on the screen? > I think so. > > So is it correct to say that the LCD bottom 4 lines display garbage at > certain times > * not after a (hard) reset - you get a correct MENU display (not just a > RESET but a HARD RESET?) > * when you enter BASIC and/or run any software, the LCD bottom half shows > garbage? > > I would suggest that you run a memory test. > I doubt that you have a fundamental problem with the LCD system, nor the > keyboard system. > > good problem! > > > > On Wed, Jul 22, 2020 at 9:02 AM Chris Fezzler wrote: > > I'm trying to troubleshoot what components on the circuit board process > keystrokes and send them to the screen. > > The screen and keyboard on my Model 100 are in perfect working order. But > only the top four are processing correctly. > > The bottom four are displaying gibberish. But if I type commands in > BASIC, they work. So again, not the keyboard or > screen but components that process the bottom half. A hard rest will > present a perfect menu screen. But upon entering > an app, the bottom four lines are not getting proper signal. > > Sorry, I'm not an electronics or computer engineer. Just a hobbyist with > a soldering iron and a willingness to learn. > Plan to look at Technical Reference Manual to see if I can troubleshoot. > > On Wednesday, July 22, 2020, 01:15:25 AM EDT, John R. Hogerhuis < > jho...@pobox.com> wrote: > > > > > On Tue, Jul 21, 2020 at 5:08 PM Chris Fezzler wrote: > > Is there a way to search old Listserv messages so I can research before > embarrass...err...I mean ask a dumb question. > > Seriously, would like to research. > > > > How old are we talking? > > Gmane was our archive until it went down for a long time. Then it was back > up recently but only accessible through nntp readers. Not sure the status > of that. > > Our GNU Mailman list itself has an archive which goes back to 2011 when I > took over running the list. > > http://lists.bitchin100.com/private.cgi/m100-bitchin100.com/ > > Or just ask. We Are The Archive. > > -- John. > >
Re: [M100] Listserv Search
Sorry - typing too fast. Top four lines of the screen. Yes, mostly garbage all of the time. Except a hard rest will generate a proper menu screen.Yes, in BASIC the same. But if I type in a test program and hit RUN the program will indeed run.So the computer is getting the commands/keystrokes. Just not displaying bottom four lines. I think it is a component issue. On Wednesday, July 22, 2020, 09:20:53 AM EDT, Stephen Adolph wrote: Hi Chris, What do you mean by "the top 4". Do you mean top 4 lines on the screen? I think so. So is it correct to say that the LCD bottom 4 lines display garbage at certain times* not after a (hard) reset - you get a correct MENU display (not just a RESET but a HARD RESET?)* when you enter BASIC and/or run any software, the LCD bottom half shows garbage? I would suggest that you run a memory test.I doubt that you have a fundamental problem with the LCD system, nor the keyboard system. good problem! On Wed, Jul 22, 2020 at 9:02 AM Chris Fezzler wrote: I'm trying to troubleshoot what components on the circuit board process keystrokes and send them to the screen. The screen and keyboard on my Model 100 are in perfect working order. But only the top four are processing correctly. The bottom four are displaying gibberish. But if I type commands in BASIC, they work. So again, not the keyboard orscreen but components that process the bottom half. A hard rest will present a perfect menu screen. But upon entering an app, the bottom four lines are not getting proper signal. Sorry, I'm not an electronics or computer engineer. Just a hobbyist with a soldering iron and a willingness to learn.Plan to look at Technical Reference Manual to see if I can troubleshoot. On Wednesday, July 22, 2020, 01:15:25 AM EDT, John R. Hogerhuis wrote: On Tue, Jul 21, 2020 at 5:08 PM Chris Fezzler wrote: Is there a way to search old Listserv messages so I can research before embarrass...err...I mean ask a dumb question. Seriously, would like to research. How old are we talking? Gmane was our archive until it went down for a long time. Then it was back up recently but only accessible through nntp readers. Not sure the status of that. Our GNU Mailman list itself has an archive which goes back to 2011 when I took over running the list. http://lists.bitchin100.com/private.cgi/m100-bitchin100.com/ Or just ask. We Are The Archive. -- John.
Re: [M100] Listserv Search
The screen has multiple chips that control chunks of the screen. Each chip has its own chip select line labeled CS## on schematic. Seems like those chip select signals are not all getting through. Sent from my Windows 10 phone From: Chris Fezzler Sent: Wednesday, July 22, 2020 8:02 AM To: m...@bitchin100.com Subject: Re: [M100] Listserv Search I'm trying to troubleshoot what components on the circuit board process keystrokes and send them to the screen. The screen and keyboard on my Model 100 are in perfect working order. But only the top four are processing correctly. The bottom four are displaying gibberish. But if I type commands in BASIC, they work. So again, not the keyboard or screen but components that process the bottom half. A hard rest will present a perfect menu screen. But upon entering an app, the bottom four lines are not getting proper signal. Sorry, I'm not an electronics or computer engineer. Just a hobbyist with a soldering iron and a willingness to learn. Plan to look at Technical Reference Manual to see if I can troubleshoot. On Wednesday, July 22, 2020, 01:15:25 AM EDT, John R. Hogerhuis wrote: On Tue, Jul 21, 2020 at 5:08 PM Chris Fezzler wrote: Is there a way to search old Listserv messages so I can research before embarrass...err...I mean ask a dumb question. Seriously, would like to research. How old are we talking? Gmane was our archive until it went down for a long time. Then it was back up recently but only accessible through nntp readers. Not sure the status of that. Our GNU Mailman list itself has an archive which goes back to 2011 when I took over running the list. http://lists.bitchin100.com/private.cgi/m100-bitchin100.com/ Or just ask. We Are The Archive. -- John.
Re: [M100] Listserv Search
Hi Chris, What do you mean by "the top 4". Do you mean top 4 lines on the screen? I think so. So is it correct to say that the LCD bottom 4 lines display garbage at certain times * not after a (hard) reset - you get a correct MENU display (not just a RESET but a HARD RESET?) * when you enter BASIC and/or run any software, the LCD bottom half shows garbage? I would suggest that you run a memory test. I doubt that you have a fundamental problem with the LCD system, nor the keyboard system. good problem! On Wed, Jul 22, 2020 at 9:02 AM Chris Fezzler wrote: > I'm trying to troubleshoot what components on the circuit board process > keystrokes and send them to the screen. > > The screen and keyboard on my Model 100 are in perfect working order. But > only the top four are processing correctly. > > The bottom four are displaying gibberish. But if I type commands in > BASIC, they work. So again, not the keyboard or > screen but components that process the bottom half. A hard rest will > present a perfect menu screen. But upon entering > an app, the bottom four lines are not getting proper signal. > > Sorry, I'm not an electronics or computer engineer. Just a hobbyist with > a soldering iron and a willingness to learn. > Plan to look at Technical Reference Manual to see if I can troubleshoot. > > On Wednesday, July 22, 2020, 01:15:25 AM EDT, John R. Hogerhuis < > jho...@pobox.com> wrote: > > > > > On Tue, Jul 21, 2020 at 5:08 PM Chris Fezzler wrote: > > Is there a way to search old Listserv messages so I can research before > embarrass...err...I mean ask a dumb question. > > Seriously, would like to research. > > > > How old are we talking? > > Gmane was our archive until it went down for a long time. Then it was back > up recently but only accessible through nntp readers. Not sure the status > of that. > > Our GNU Mailman list itself has an archive which goes back to 2011 when I > took over running the list. > > http://lists.bitchin100.com/private.cgi/m100-bitchin100.com/ > > Or just ask. We Are The Archive. > > -- John. >
Re: [M100] Listserv Search
I'm trying to troubleshoot what components on the circuit board process keystrokes and send them to the screen. The screen and keyboard on my Model 100 are in perfect working order. But only the top four are processing correctly. The bottom four are displaying gibberish. But if I type commands in BASIC, they work. So again, not the keyboard orscreen but components that process the bottom half. A hard rest will present a perfect menu screen. But upon entering an app, the bottom four lines are not getting proper signal. Sorry, I'm not an electronics or computer engineer. Just a hobbyist with a soldering iron and a willingness to learn.Plan to look at Technical Reference Manual to see if I can troubleshoot. On Wednesday, July 22, 2020, 01:15:25 AM EDT, John R. Hogerhuis wrote: On Tue, Jul 21, 2020 at 5:08 PM Chris Fezzler wrote: Is there a way to search old Listserv messages so I can research before embarrass...err...I mean ask a dumb question. Seriously, would like to research. How old are we talking? Gmane was our archive until it went down for a long time. Then it was back up recently but only accessible through nntp readers. Not sure the status of that. Our GNU Mailman list itself has an archive which goes back to 2011 when I took over running the list. http://lists.bitchin100.com/private.cgi/m100-bitchin100.com/ Or just ask. We Are The Archive. -- John.
Re: [M100] Listserv Search
On Tue, Jul 21, 2020 at 5:08 PM Chris Fezzler wrote: > Is there a way to search old Listserv messages so I can research before > embarrass...err...I mean ask a dumb question. > > Seriously, would like to research. > How old are we talking? Gmane was our archive until it went down for a long time. Then it was back up recently but only accessible through nntp readers. Not sure the status of that. Our GNU Mailman list itself has an archive which goes back to 2011 when I took over running the list. http://lists.bitchin100.com/private.cgi/m100-bitchin100.com/ Or just ask. We Are The Archive. -- John.
[M100] Listserv Search
Is there a way to search old Listserv messages so I can research before embarrass...err...I mean ask a dumb question. Seriously, would like to research.
