Re: [M100] need a timer IC uPD1990AC
You sure it wasn't the one you took out of your model t? ;-) -- John.
[M100] need a timer IC uPD1990AC
hey folks, Hope everyone is having a nice spring (in the northern half of the world anyways!). I've been working my way through my stacks of modelTs and as I fix'em I periodically need to get some parts. Planning to sell some of them. I have so many of them. I'm in need of a timer chip, the uPD1990AC, found in most ModelTs (except T200 I think). Before I look for a source, does anyone have a spare lying around? Long shot I know. But worth asking. Speaking of long shot, I also needed a 40 Pin socket for the System Bus on an M100. I don't know why, but I guess I pulled one out of an M100 for some reason, and now I want to repair it. I figured - I would never find the original part. So old! But the original would be great! Well, I went into the office for the first time in 2 years yesterday. They are asking everyone to clear out their cubicles, and I work at a company that happens to have a lot of old time hardware engineers. There was a big bin for "scrap". I could not resist, so I peered into the bin. Could not believe my eyes. There, in the bin amongst a ton of standard e-trash, was a single RW 40 pin DIL machine pin socket! Can you bloody believe that. I should buy a lottery ticket ;). (but no timer chip!) Steve
Re: [M100] M100/M102 printing
Hi Brian , I actually share some of your concerns about my choice of a (partially) metallic centronics ; but what made my decision is that the actual original Tandy cable had a metallic centronics connector so I basically made the same. The original was just grey but I went for rainbow because well it’s way cooler this way :) There are however some custom made cables I saw with a complete metallic plug ( and sometimes even metalllic case ) and this makes no sense to me for the reasons you stated https://ibb.co/511YRxy This is my cable(s) - and the centronics connector is the same that was in the original Tandy . I have strain reliefs on both sides . Brian K. White mailto:b.kenyo...@gmail.com)> 30 avr. 2022, 20:57:37 wrote: > > Small note about the centronics connector: Metal centronics is not necessarily better in this case. Since this is originally supposed to be a portable computer, the accessories also ideally want to be portable, and there are a few different features that make that a little more or less optimal. A plastic connector is better for a laptop bag for two reasons. It weighs less, and doesn't damage other objects it's banging around with. Plus, a final detail, in particular there is the shape of the bail locks. There is a style of plastic connector where the bail locks have a lower profile triangular shape vs a larger more bowtie or butterfly wing shape that sticks out more and is a little more annoying in a bag with other cables. No bail locks at all is even better for bag-annoyance, but I think having the bail locks is worth more. Ideally you want plastic, with that less-snaggy shape, and most importantly a strain-relief clip on the crimp side. The futurlec one linked on tandy.wiki is plastic and has strain relief and not the ideal wing shape, but the wings are pretty stubby so it's not bad. There are others on digikey but they either lack a strain relief or they cost a lot more for no reason. This is an example of the ideal wing shape I mean (but don't use this connector, it's the wrong kind of wire attachment, it's just to show the bail lock shape) https://www.digikey.com/short/300fczp9 This one is at least usable, the cable attaches by IDC crimp, but no strain relief, and a strain relief is more important than any of these other considerations, also notice it's $16 whopping instead of $2.50 https://www.digikey.com/short/57fnbdqw The ideal would be the futurlec one with these bail locks, but the futurlec ones are stubby enough that its good enough. It's a very minor difference at that point. The metal ones are usually the real big and pointy ones. So, 90% ideal plus only $2.50 is why that's the linked one. -- bkw On Sat, Apr 30, 2022, 10:42 AM Cedric Amand wrote: Thanks, It's indeed related to my DIP switch "SLCT IN" Now I'm able to print, the carriage return is replaced by an uppercase "angstrom" sign but it's a good start By the way, in case anyone is interested, I was forced to order stuff "5 times" for my printer cables, so I'm gonna make 4 more DIP26 -> Centronics adapter cables and put them on ebay, I would gladly sell some of them "at cost" to members of this mailing list first. (they would be shipping from belgium so probably for fellow european geeks only) I used fancy "apple rainbow" flat cable to make them extra cool and quailty centronics (metal). Email me if interested. Le 2022-04-30 16:31, Joshua O'Keefe a écrit : On Apr 30, 2022, at 6:50 AM, Cedric Amand wrote: > > 1) A switch between what they call EPSON and IBM mode (no idea what this does but looks interesting) > If anyone knows about those two modes, please share :) Epson mode will likely set the printer to use Esc-P control codes, and IBM mode will probably set it to use Esc-[ control codes and possibly map the character set to match an IBM PC's. My suspicion is that this switch, at least, won't affect your printer ready line issue.
Re: [M100] M100/M102 printing
Small note about the centronics connector: Metal centronics is not necessarily better in this case. Since this is originally supposed to be a portable computer, the accessories also ideally want to be portable, and there are a few different features that make that a little more or less optimal. A plastic connector is better for a laptop bag for two reasons. It weighs less, and doesn't damage other objects it's banging around with. Plus, a final detail, in particular there is the shape of the bail locks. There is a style of plastic connector where the bail locks have a lower profile triangular shape vs a larger more bowtie or butterfly wing shape that sticks out more and is a little more annoying in a bag with other cables. No bail locks at all is even better for bag-annoyance, but I think having the bail locks is worth more. Ideally you want plastic, with that less-snaggy shape, and most importantly a strain-relief clip on the crimp side. The futurlec one linked on tandy.wiki is plastic and has strain relief and not the ideal wing shape, but the wings are pretty stubby so it's not bad. There are others on digikey but they either lack a strain relief or they cost a lot more for no reason. This is an example of the ideal wing shape I mean (but don't use this connector, it's the wrong kind of wire attachment, it's just to show the bail lock shape) https://www.digikey.com/short/300fczp9 This one is at least usable, the cable attaches by IDC crimp, but no strain relief, and a strain relief is more important than any of these other considerations, also notice it's $16 whopping instead of $2.50 https://www.digikey.com/short/57fnbdqw The ideal would be the futurlec one with these bail locks, but the futurlec ones are stubby enough that its good enough. It's a very minor difference at that point. The metal ones are usually the real big and pointy ones. So, 90% ideal plus only $2.50 is why that's the linked one. -- bkw On Sat, Apr 30, 2022, 10:42 AM Cedric Amand wrote: Thanks, It's indeed related to my DIP switch "SLCT IN" Now I'm able to print, the carriage return is replaced by an uppercase "angstrom" sign but it's a good start By the way, in case anyone is interested, I was forced to order stuff "5 times" for my printer cables, so I'm gonna make 4 more DIP26 -> Centronics adapter cables and put them on ebay, I would gladly sell some of them "at cost" to members of this mailing list first. (they would be shipping from belgium so probably for fellow european geeks only) I used fancy "apple rainbow" flat cable to make them extra cool and quailty centronics (metal). Email me if interested. Le 2022-04-30 16:31, Joshua O'Keefe a écrit : On Apr 30, 2022, at 6:50 AM, Cedric Amand wrote: > > 1) A switch between what they call EPSON and IBM mode (no idea what this does but looks interesting) > If anyone knows about those two modes, please share :) Epson mode will likely set the printer to use Esc-P control codes, and IBM mode will probably set it to use Esc-[ control codes and possibly map the character set to match an IBM PC's. My suspicion is that this switch, at least, won't affect your printer ready line issue.
Re: [M100] M100/M102 printing
Thanks, It's indeed related to my DIP switch "SLCT IN" Now I'm able to print, the carriage return is replaced by an uppercase "angstrom" sign but it's a good start By the way, in case anyone is interested, I was forced to order stuff "5 times" for my printer cables, so I'm gonna make 4 more DIP26 -> Centronics adapter cables and put them on ebay, I would gladly sell some of them "at cost" to members of this mailing list first. (they would be shipping from belgium so probably for fellow european geeks only) I used fancy "apple rainbow" flat cable to make them extra cool and quailty centronics (metal). Email me if interested. Le 2022-04-30 16:31, Joshua O'Keefe a écrit : > > On Apr 30, 2022, at 6:50 AM, Cedric Amand wrote: > > > > 1) A switch between what they call EPSON and IBM mode (no idea what this does but looks interesting) > > If anyone knows about those two modes, please share :) > > Epson mode will likely set the printer to use Esc-P control codes, and IBM mode will probably set it to use Esc-[ control codes and possibly map the character set to match an IBM PC's. > > My suspicion is that this switch, at least, won't affect your printer ready line issue.
Re: [M100] M100/M102 printing
On Apr 30, 2022, at 6:50 AM, Cedric Amand wrote: > > 1) A switch between what they call EPSON and IBM mode (no idea what this does > but looks interesting) > If anyone knows about those two modes, please share :) Epson mode will likely set the printer to use Esc-P control codes, and IBM mode will probably set it to use Esc-[ control codes and possibly map the character set to match an IBM PC's. My suspicion is that this switch, at least, won't affect your printer ready line issue.
Re: [M100] M100/M102 printing
check pin 25; I think if the input from the printer is low you will be unable to print and the laptop will "freeze". [image: image.png] btw Cedric, were you able to snap that PCB pic I was asking about? thanks! Steve On Sat, Apr 30, 2022 at 6:15 AM Cedric Amand wrote: > Hello everyone > > I just finished my IDC 26 to centronics cable trying to print from my M102 > I'm printing on a 1985 Brother HL1109 so that should be period accurate > > Nothing happens if I hit "print", the M102 freezes and I have to "reset". > > I read on some TRS80 related documentation that there are POKE locations > to set the baud rate of centronics > Does that applyto the M100/M102 ? > What are the defaults ? Where are those POKEs and settings if any ? > I loked at the manual but apart from "hit PRINT" there isn't much info > > thanks ! >
[M100] M100/M102 printing
Hello everyone I just finished my IDC 26 to centronics cable trying to print from my M102 I'm printing on a 1985 Brother HL1109 so that should be period accurate Nothing happens if I hit "print", the M102 freezes and I have to "reset". I read on some TRS80 related documentation that there are POKE locations to set the baud rate of centronics Does that applyto the M100/M102 ? What are the defaults ? Where are those POKEs and settings if any ? I loked at the manual but apart from "hit PRINT" there isn't much info thanks !
