o:bir...@soigeneris.com>>
To: mailto:m...@bitchin100.com>>
Subject: Re: [M100] Model 100 - LCD Shows Pixels Only
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Is it poss
ir...@soigeneris.com
<mailto:bir...@soigeneris.com>)
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Message: 1
Date: Wed, 3 Jan 2024 15:04:44 -0600
From: mailto:bir...@soigeneris.com>>
To: mailto:m...@bitchin100.com>>
Subject: Re: [M100]
. Re: Model 100 - LCD Shows Pixels Only (bir...@soigeneris.com)
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Message: 1
Date: Wed, 3 Jan 2024 15:04:44 -0600
From:
To:
Subject: Re: [M100] Model 100 - LCD Shows Pixels Only
Message-ID: <011501da3e88$7a625530$6f26ff
t;1. Re: Model 100 - LCD Shows Pixels Only (bir...@soigeneris.com)
>
>
> --
>
> Message: 1
> Date: Wed, 3 Jan 2024 15:04:44 -0600
> From:
> To:
> Subject: Re: [M100] Model 100 - LCD Shows Pixels Only
> Mess
, January 3, 2024 10:23 AM
To: m...@bitchin100.com
Subject: Re: [M100] Model 100 - LCD Shows Pixels Only
Yes, I did hold down CTRL+BREAK+press reset. Repeated this three times and the
data is almost identical (repeatable results). I triggered off of the reset
signal and recorded 100ms pre-trigger
ROM board has a small built in LCD for feedback. You won’t have this but you
can follow how far it gets though the test with your LA.
Jeff Birt
From: M100 On Behalf Of Eric
Sent: Wednesday, January 3, 2024 10:23 AM
To: m...@bitchin100.com
Subject: Re: [M100] Model 100 - LCD Shows Pixels
, January 2, 2024 7:31 PM
To: m100@lists.bitchin100.com; m...@bitchin100.com
Subject: Re: [M100] Model 100 - LCD Shows Pixels Only
I had an interesting finding:
With the M12 ROM installed, pin 20 (A11) is stuck in a high state (5V).
With the M12 ROM removed, all address lines are in a high state
the code from ROM to RAM that I mentioned before.
Jeff Brt
From: M100 On Behalf Of Eric
Sent: Tuesday, January 2, 2024 7:31 PM
To: m100@lists.bitchin100.com; m...@bitchin100.com
Subject: Re: [M100] Model 100 - LCD Shows Pixels Only
I had an interesting finding:
With the M12 ROM
Then I had to guess at
> what bit 0 might have actually been by looking at the disassembly. A lot
> of work but I learned a lot on the process.
>
> Good luck,
>
> Jeff Birt
>
> *From:*M100 <mailto:m100-boun...@lists.bitchin100.com>> *On Behalf Of *Eric
> *Sent:*
Yes, the logic analyzer supports logic levels up to 5.5V. The Saleae software
does not have a 5V option, only 1.2V, 1.8V or 3.3+ Volts.
On Monday, January 1, 2024 at 08:52:17 PM PST, Daryl Tester
wrote:
On 2/1/24 12:30, Eric wrote:
> Digital Voltage Setting: 3.3+ Volts
You don't
.@soigeneris.com
wrote:
Eric,
Sent you a mail off list with a link to my capture files, etc.
Jeff
*From:* M100 *On Behalf Of *Eric
*Sent:* Friday, December 29, 2023 2:00 AM
*To:* m...@bitchin100.com
*Subject:* Re: [M100] Model 100 - LCD Shows Pixels Only
Hi Jeff,
Luckily my logic analyz
On 2/1/24 12:30, Eric wrote:
Digital Voltage Setting: 3.3+ Volts
You don't actually mention what your logic analyser is, but I'm guessing it's 5
volt tolerant?
Cheers,
--dt
ic
On Friday, December 29, 2023 at 06:18:35 AM PST, bir...@soigeneris.com
wrote:
Eric,
Sent you a mail off list with a link to my capture files, etc.
Jeff
From: M100 On Behalf Of Eric
Sent: Friday, December 29, 2023 2:00 AM
To: m...@bitchin100.com
Subject: Re: [M100] Mod
Of Eric
Sent: Friday, December 29, 2023 2:00 AM
To: m...@bitchin100.com
Subject: Re: [M100] Model 100 - LCD Shows Pixels Only
Hi Jeff,
Luckily my logic analyzer does have more than 8 channels.
Can you give me some feedback on these settings:
Chip M2 TC40H245P - Octal Bi-Directiona
Eric,
Sent you a mail off list with a link to my capture files, etc.
Jeff
From: M100 On Behalf Of Eric
Sent: Friday, December 29, 2023 2:00 AM
To: m...@bitchin100.com
Subject: Re: [M100] Model 100 - LCD Shows Pixels Only
Hi Jeff,
Luckily my logic analyzer does have more than 8
by looking at the disassembly. A lot of work but I learned a lot
on the process.
Good luck,
Jeff Birt
From: M100 On Behalf Of Eric
Sent: Thursday, December 28, 2023 12:00 PM
To: m...@bitchin100.com
Subject: Re: [M100] Model 100 - LCD Shows Pixels Only
Thank you everyone for the quick
From: M100 On Behalf Of Eric
Sent: Thursday, December 28, 2023 12:00 PM
To: m...@bitchin100.com
Subject: Re: [M100] Model 100 - LCD Shows Pixels Only
Thank you everyone for the quick response!
When I power up the computer, all pixels are on and remain dark (LCD is
entirely "
I had a RAM problem with my Model 100 when I first got it. It seemed to work
fine initially, but attempting to paste text resulted in odd characters
appearing, and the amount of free memory slashing drastically.
Various people were very confused as to why this was happening, but a bit of
Thank you everyone for the quick response!
When I power up the computer, all pixels are on and remain dark (LCD is
entirely "black").
Contrast potentiometer: Seems to work as intended. The display will lighten
or darken as the potentiometer is adjusted.
LCD PCB: No signs of corrosion
One thing about the LCD; if the lcd driver write acknowledge signal is
broken, the cpu will be caught in an endless loop waiting for thr drivers
to write successfully.
In this state the cpu would be running but in a software loop polling the
driver write ack signal.
Sounds like a possibility
On Thu, Dec 28, 2023 at 10:35 AM wrote:
> When LCDs with these types of LCD driers first power up they turn on all
> the pixels. You will see this even in brand new ‘modern’ dot matrix LCD
> module (on the new LCDs the multiline modules tend to only make the first
> row black on power up.) Only
: Wednesday, December 27, 2023 11:56 PM
To: m100@lists.bitchin100.com
Subject: [M100] Model 100 - LCD Shows Pixels Only
Hi,
I'm working to troubleshoot a non-functional Model 100 that only displays
pixels when powered up. Seems these computers occasionally have RAM issues but
I'm not sure
On Thu, Dec 28, 2023 at 1:13 AM Eric wrote:
> Hi,
>
> I'm working to troubleshoot a non-functional Model 100 that only displays
> pixels when powered up. Seems these computers occasionally have RAM issues
> but I'm not sure how to identify faulty RAM that has not been removed. The
> RAM
Could be a bad contrast potentiometer.
On Thu, Dec 28, 2023, 1:13 AM Eric wrote:
> Hi,
>
> I'm working to troubleshoot a non-functional Model 100 that only displays
> pixels when powered up. Seems these computers occasionally have RAM issues
> but I'm not sure how to identify faulty RAM that
Hi,
I'm working to troubleshoot a non-functional Model 100 that only displays
pixels when powered up. Seems these computers occasionally have RAM issues but
I'm not sure how to identify faulty RAM that has not been removed. The RAM
modules are soldered in place and I would like to
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