Re: [M100] REXCPM 102 - it's arrived - Let's Livestream an install!

[Tim Russell]

Very nice stream, Josh!  The whole time you were hooking the screen and
keyboard back up I was internally screaming "THE BOARD COVER!!" but I knew
you'd get it.

Tim

Re: [M100] REXCPM 102 - it's arrived - Let's Livestream an install!

[Brian K. White]

On 7/28/20 6:04 PM, Josh Malone wrote:

Got my REXCPM 102 today


Mine arrived today as well. And I can't play with it yet!!

--
bkw

Re: [M100] REXCPM 102 - it's arrived - Let's Livestream an install!

[Chris Fezzler]

 Really enjoyed this.  Thanks!  Well done.
On Tuesday, July 28, 2020, 06:05:03 PM EDT, Josh Malone 
 wrote:  
 
 Got my REXCPM 102 today (well, finally checked my post box and picked it up, 
anyway).
I haven't done a live stream in a while, so I'm going to livestream the install 
in my "spare" 102.
8PM Eastern time tonite (July 28)
https://www.twitch.tv/48kram 
Thanks so much, Steve and Phil. I'll be reviewing all the docs now :)
-Josh  

Re: [M100] Model T Terminal

[Jim Anderson]

TEXT definitely uses it.  It’s hard to tell because the emulation isn’t quite 
right using PuTTY, but when I was messing with VT100.CO it seemed like the 
screen in TEXT got all messed up when scrolling down through a large file 
unless I sized the window at 80x25.  It still seems to get really messed up if 
I turn on the Label line (although worse if it’s 80x24).  I think BASIC is 
pretty messed up with the Label line turned on, too.  I’ll have to go try it.

Are TEXT and TELCOM maybe the only M100 applications which actually make use of 
the full 80x25 of a DVI?  I hadn’t really thought about it.  If the screen area 
of the MVT100 is not user-selectable then I guess 80x24 is the most compatible 
mode – not so useful for TEXT or TELCOM or having the Label line turned on in 
BASIC but definitely best for CP/M and at least it’ll give a large area to 
scroll for BASIC programs that weren’t intended for the M100…







jim

From: M100 [mailto:m100-boun...@lists.bitchin100.com] On Behalf Of Stephen 
Adolph
Sent: Tuesday, July 28, 2020 5:05 PM
To: m...@bitchin100.com
Subject: Re: [M100] Model T Terminal

CAUTION External Sender: Do not click links or open attachments unless you 
recognize the sender and know the content is safe.

it is 80x24.  I don't think any M100 applications use 80x25 at all actually. 
Does anything use DVI?

Re: [M100] LCD Botton 4 Lines (WAS) Listserv Search

[Chris Fezzler]

 John - I'm going back in  LOL.
On Tuesday, July 28, 2020, 04:11:18 PM EDT, John R. Hogerhuis 
 wrote:  
 
 

On Tue, Jul 28, 2020 at 12:45 PM Chris Fezzler  wrote:

 :(  Short lived.  Worked for 2-day.  Back to old glitch.


Still, almost certainly the problem is at the connector then if tightening 
fixed it up for a time
-- John.  

Re: [M100] Model T Terminal

[Stephen Adolph]

it is 80x24.  I don't think any M100 applications use 80x25 at all
actually. Does anything use DVI?


On Tue, Jul 28, 2020 at 7:56 PM Jim Anderson  wrote:

> Question for you: is it going to be 80x24, or 80x25, or user-selectable?
> I know the DVI was 80x25 and applications in the M100 environment are
> probably going to expect that, whereas CP/M applications expecting a VT100
> are mostly going to be expecting 80x24 (some allow you to configure the
> screen size, some don’t)…
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
> jim
>
>
>
> *From:* M100 [mailto:m100-boun...@lists.bitchin100.com] *On Behalf Of *Stephen
> Adolph
> *Sent:* Tuesday, July 28, 2020 3:20 PM
> *To:* m...@bitchin100.com
> *Subject:* Re: [M100] Model T Terminal
>
>
>
> *CAUTION External Sender:* Do not click links or open attachments unless
> you recognize the sender and know the content is safe.
>
>
>
> It is going.  Thanks for asking.
>
>
>
> I have tested the pcb and it seems ok.
>
> I have some parts now.
>
> I have some bugs to fix with the firmware for the video adapter tho.
>
>
>
> There's always bugs.  I was thinking that anyone who got one would
> eventually need to learn how to upgrade the firmware on their own... so no
> reason not to get it out there.
>
>
>
>
>
>
>
> On Tuesday, July 28, 2020, dano none  wrote:
>
> Hi Steve,
>
>  For those of us playing from home, how goes work on the Model T Terminal
> Adapter, the last I remember reading on the list was you were having
> problems with the loader?
>
> Thanks,
>
> Dano
>
>

Re: [M100] Model T Terminal

[Jim Anderson]

Question for you: is it going to be 80x24, or 80x25, or user-selectable?  I 
know the DVI was 80x25 and applications in the M100 environment are probably 
going to expect that, whereas CP/M applications expecting a VT100 are mostly 
going to be expecting 80x24 (some allow you to configure the screen size, some 
don’t)…







jim

From: M100 [mailto:m100-boun...@lists.bitchin100.com] On Behalf Of Stephen 
Adolph
Sent: Tuesday, July 28, 2020 3:20 PM
To: m...@bitchin100.com
Subject: Re: [M100] Model T Terminal

CAUTION External Sender: Do not click links or open attachments unless you 
recognize the sender and know the content is safe.

It is going.  Thanks for asking.

I have tested the pcb and it seems ok.
I have some parts now.
I have some bugs to fix with the firmware for the video adapter tho.

There's always bugs.  I was thinking that anyone who got one would eventually 
need to learn how to upgrade the firmware on their own... so no reason not to 
get it out there.




On Tuesday, July 28, 2020, dano none 
mailto:daneiche...@hotmail.com>> wrote:
Hi Steve,
 For those of us playing from home, how goes work on the Model T Terminal 
Adapter, the last I remember reading on the list was you were having problems 
with the loader?
Thanks,
Dano

Re: [M100] Model T Terminal

[Stephen Adolph]

It is going.  Thanks for asking.

I have tested the pcb and it seems ok.
I have some parts now.
I have some bugs to fix with the firmware for the video adapter tho.

There's always bugs.  I was thinking that anyone who got one would
eventually need to learn how to upgrade the firmware on their own... so no
reason not to get it out there.




On Tuesday, July 28, 2020, dano none  wrote:

> Hi Steve,
>  For those of us playing from home, how goes work on the Model T Terminal
> Adapter, the last I remember reading on the list was you were having
> problems with the loader?
> Thanks,
> Dano
>

[M100] Model T Terminal

[dano none]

Hi Steve,
 For those of us playing from home, how goes work on the Model T Terminal 
Adapter, the last I remember reading on the list was you were having problems 
with the loader?
Thanks,
Dano

Re: [M100] LCD Botton 4 Lines (WAS) Listserv Search

[Jeffrey Birt]

You squeezed the end of the ribbon cable that plugs into the main board? 

 

Jeff Birt

 

From: M100  On Behalf Of Chris Fezzler
Sent: Tuesday, July 28, 2020 2:45 PM
To: m...@bitchin100.com
Subject: Re: [M100] LCD Botton 4 Lines (WAS) Listserv Search

 

:(  Short lived.  Worked for 2-day.  Back to old glitch.

 

 

 

On Sunday, July 26, 2020, 06:26:04 PM EDT, Jeffrey Birt mailto:bir...@soigeneris.com> > wrote: 

 

 

Excellent! Let us know!

 

Jeff Birt

 

From: M100 mailto:m100-boun...@lists.bitchin100.com> > On Behalf Of Chris Fezzler
Sent: Sunday, July 26, 2020 5:19 PM
To: m...@bitchin100.com  
Subject: Re: [M100] LCD Botton 4 Lines (WAS) Listserv Search

 

Working but "uncle" LOL.

 

After logic prob test, I got some pliers and gently squeezed the LCD connector 
to ensure good contact with the clip and wires before reinstalling.

 

Fired it up.  Nothing.  Blank screen.  Warm boot, nothing.  Hard rest, LCD 
pixels went dark momentarily.  Then nothing.

 

About to call it quits but something told me to switch off, hold just CTRL and 
BREAK while turning on (no reset button).

 

It fired up perfect, all lines.  

 

Who knows?

 

We'll see if it sticks before installing REXCPM.

 

 

 

On Sunday, July 26, 2020, 05:42:36 PM EDT, Chris Fezzler mailto:fezz...@yahoo.com> > wrote: 

 

 

For what it is worth, logic probe results for LCD connector chip select pins:

 

CS01 (pin 18) = H

CS20 (pin 14) = H

CS21 (pin 12) = H

CS22 (pin 10) = H

CS23 (pin   8) = H

CS24 (pin   7) = H

CS25 (pin 16) = L

CS26 (pin 15) = L

CS27 (pin 13) = L

CS28 (pin 11) = L

CS29 (pin   9) = L

 

I took the prob positive from C83 and ground from C8.

 

 

On Sunday, July 26, 2020, 03:55:00 PM EDT, Chris Fezzler mailto:fezz...@yahoo.com> > 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 mailto:bir...@soigeneris.com> > 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 mailto:m100-boun...@lists.bitchin100.com> > 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  
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 

[M100] REXCPM 102 - it's arrived - Let's Livestream an install!

[Josh Malone]

Got my REXCPM 102 today (well, finally checked my post box and picked it
up, anyway).

I haven't done a live stream in a while, so I'm going to livestream the
install in my "spare" 102.

8PM Eastern time tonite (July 28)

https://www.twitch.tv/48kram

Thanks so much, Steve and Phil. I'll be reviewing all the docs now :)

-Josh

Re: [M100] LCD Botton 4 Lines (WAS) Listserv Search

[John R. Hogerhuis]

Never give up, never surrender :-)

-- John.

Re: [M100] LCD Botton 4 Lines (WAS) Listserv Search

[John R. Hogerhuis]

On Tue, Jul 28, 2020 at 12:45 PM Chris Fezzler  wrote:

> :(  Short lived.  Worked for 2-day.  Back to old glitch.
>
>
Still, almost certainly the problem is at the connector then if tightening
fixed it up for a time

-- John.

Re: [M100] LCD Botton 4 Lines (WAS) Listserv Search

[Chris Fezzler]

 :(  Short lived.  Worked for 2-day.  Back to old glitch.


On Sunday, July 26, 2020, 06:26:04 PM EDT, Jeffrey Birt 
 wrote:  
 
 
Excellent! Let us know!

  

Jeff Birt

  

From: M100  On Behalf Of Chris Fezzler
Sent: Sunday, July 26, 2020 5:19 PM
To: m...@bitchin100.com
Subject: Re: [M100] LCD Botton 4 Lines (WAS) Listserv Search

  

Working but "uncle" LOL.

  

After logic prob test, I got some pliers and gently squeezed the LCD connector 
to ensure good contact with the clip and wires before reinstalling.

  

Fired it up.  Nothing.  Blank screen.  Warm boot, nothing.  Hard rest, LCD 
pixels went dark momentarily.  Then nothing.

  

About to call it quits but something told me to switch off, hold just CTRL and 
BREAK while turning on (no reset button).

  

It fired up perfect, all lines.  

  

Who knows?

  

We'll see if it sticks before installing REXCPM.

  

  

  

On Sunday, July 26, 2020, 05:42:36 PM EDT, Chris Fezzler  
wrote: 

  

  

For what it is worth, logic probe results for LCD connector chip select pins:

  

CS01 (pin 18) = H

CS20 (pin 14) = H

CS21 (pin 12) = H

CS22 (pin 10) = H

CS23 (pin   8) = H

CS24 (pin   7) = H

CS25 (pin 16) = L

CS26 (pin 15) = L

CS27 (pin 13) = L

CS28 (pin 11) = L

CS29 (pin   9) = L

 

I took the prob positive from C83 and ground from C8.

  

  

On Sunday, July 26, 2020, 03:55:00 PM EDT, 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 

Re: [M100] Flickering LCD?

[Gregory McGill]

Dirty or bad contrast knob try some deoxit on it

On Tue, Jul 28, 2020, 8:13 AM mark audacity romberg 
wrote:

> My M100’s display is flickering, sometimes cutting out completely.
> Fiddling with the contrast knob or giving it a thump seems to fix it
> sometimes, but not always. Any idea what causes this, or how to fix it?
>
> —mark, KF5YDR

[M100] Flickering LCD?

[mark audacity romberg]

My M100’s display is flickering, sometimes cutting out completely. Fiddling 
with the contrast knob or giving it a thump seems to fix it sometimes, but not 
always. Any idea what causes this, or how to fix it?

—mark, KF5YDR 

Re: [M100] An interesting DB-25 right angle connector

[Joshua O'Keefe]

On Jul 28, 2020, at 5:47 AM, Brian White  wrote:
> A female connector is a mirror image of a male

Brian, thank you for taking the time to walk me through this in detail.  As 
someone decidedly not mechanically inclined it is educational and helps me put 
the pieces of the puzzle together.

Re: [M100] An interesting DB-25 right angle connector

[Brian White]

It IS standard DTE pinout, merely female.

A female connector is a mirror image of a male connector.

Look at the numbers on the pins, not their physical location.

A gender-changer does not simply make the existing female pins male, it
also relocates all pins to their mirror image locations. That's why the
mini gender-changers always flip the D shape upside-down from one side to
the other.

Take a female connector, look at it's face with the longer row of pins on
top, and find pin #1 (top-left I think). Now imagine a male connector is
inserted. That pin#1 position is also pin#1 on the male connector. Now
imagine taking the male connector out and looking at it's face. Where pin#1
is top-left on one connector, it's top-right on the other.

-- 
bkw

On Mon, Jul 27, 2020, 12:58 PM Joshua O'Keefe 
wrote:

> On Jul 27, 2020, at 6:41 AM, B 9  wrote:
>
> Molex 1731090178
> 
>
> Wouldn't you need to change the wiring since the pins go from
> left-to-right instead of right-to-left?
>
>
> A lot of the plain through-hole stuff I saw didn't look like it had the
> lead length to make a solid friction fit into the port and still sit nice
> and flush against the top edge of the T like mine does, but that Molex with
> the nice long leads looks like it might do it if can transplant the
> mounting greebles from the old one.  I haven't taken measurements yet but
> it looks like a fairly close match by eyeball.  Nice find!
>
> I wasn't aware the T's serial port was wired backwards, though.  I thought
> it was just female where DTE is customarily male. Maybe I should continue
> to stick with what I have since it works even if the sequence of adapters
> between any given two devices can get a little unwieldy.
>