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Author Topic: Weird TR graphics error **SOLVED**  (Read 2333 times)

KoleThomsen

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Weird TR graphics error **SOLVED**
« on: September 20, 2014, 01:08:11 PM »
Opened up Total Recall today, and it looked like this (bus switch 8 and expander release time looks weird).
It's the same on all the mono channels. Stereo channels look fine.

Has anyone seen this before?

(G+ computer, Ultimation.)
« Last Edit: May 01, 2016, 01:48:29 AM by Matt Sartori »
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sintech

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Re: Weird TR graphics error
« Reply #1 on: September 20, 2014, 01:27:51 PM »
Power cycle the computer.. but it looks like a Ram issue.
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KoleThomsen

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Re: Weird TR graphics error
« Reply #2 on: September 21, 2014, 10:39:50 PM »
I tried rebooting. Still the same.
RAM chips on the TR graphics card or the CPU motherboard?

Thanks in advance!
K
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sintech

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Re: Weird TR graphics error
« Reply #3 on: September 22, 2014, 06:01:31 AM »
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KoleThomsen

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Re: Weird TR graphics error
« Reply #4 on: September 22, 2014, 12:31:09 PM »
Perfect! Thanks alot, sintech!  :)
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ULH

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Solved!
« Reply #5 on: January 29, 2016, 10:00:39 AM »
Just to update this thread: The issue was in the 4116 ram on the RML CPU board 82e301 (in the middle of the TR sandwich) ic25-33. I started by switching the c25-32 for ic 33-40 then the Total Recall cpu would not boot.

Be aware that on the RGB graphic card these 4116 ram are also present x8. But our issue were only with the mono channel TR image and not the stereo channel TR image and therefore the graphic memory worked just fine.

So many thanks to sintech for being spot on as always!

This links explains what I think was our issue: Some bits were stuck but not en entire ram ic. It seems that 4116 ram are common to fail.
http://atariage.com/forums/topic/229064-testing-4116-ram-chips-out-of-circuit/?p=3059546
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Artur D'Assumpção

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Re: Weird TR graphics error
« Reply #6 on: January 29, 2016, 04:40:20 PM »
Great discovery! :)

Those are always a  b***h to spot! ;)

Did you test the ram or just swapped for new ICs until it worked?

Cheers,

Artur
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ULH

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Re: Weird TR graphics error
« Reply #7 on: January 31, 2016, 12:36:20 PM »
Thanks. I just swapped the modules until it worked. The bad ram sectors are still there probably just in a position where the fault doesn't matter - or I might not have found out which fault they are resulting in with this new position. I will order 16 or 24 (8 for the HRG graphics card) new and change out all the 4116 ram.

Cheers,

Uffe
« Last Edit: January 31, 2016, 02:00:27 PM by ULH »
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sintech

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Re: Weird TR graphics error
« Reply #8 on: January 31, 2016, 12:40:42 PM »
Awesomeness  :)
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Artur D'Assumpção

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Re: Weird TR graphics error
« Reply #9 on: January 31, 2016, 08:49:59 PM »
great work man! It's never too much to have some extra chips! :D I am glad you found the problem, that was a tricky one!
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