Video problem on STE

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Strider
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Joined: Mon Mar 12, 2018 9:15 pm

Video problem on STE

Post by Strider »

Hello,

Yesterday I've recapped the PSUs of my 2 STEs.
I attached a photo, the PSUs have been controlled before starting the STEs.

However I have some video problems with these demos showing "true colour" pictures.
Here is an example:



My 2 STEs have the same problem. I also try swapping the PSUs, no difference.
What could be the issue?
Voltage?
I measured 5.2v and 12.16v on the output. Is it too high?
Thanks.
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exxos
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Re: Video problem on STE

Post by exxos »

Can you post the program you are using and I can test it on one of my machines.
https://www.exxosforum.co.uk/atari/ All my hardware guides - mods - games - STOS
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viewtopic.php?f=17&t=1585 Have you done the Mandatory Fixes ?
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People should find solutions to problems, not find problems with solutions.
Strider
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Joined: Mon Mar 12, 2018 9:15 pm

Re: Video problem on STE

Post by Strider »

Yes, this one: https://demozoo.org/productions/180989/
Here is the direct link if you have a hard disk: http://files.dhs.nu/files_demo/wonworld11_hd.zip
or a floppy disk: http://files.dhs.nu/files_demo/wonworld11_dd.zip (needs a MSA to disk conversion though)

I tried to lower the 5V, now it is 5.01V instead of 5.20V, but it makes no difference, video is still buggy.
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exxos
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Re: Video problem on STE

Post by exxos »

OK I can confirm same problem.. I get corruption down the right side as well as "random" corruption in the image...

IMG_2350.JPG
IMG_2350.JPG (5.85 MiB) Viewed 5205 times

My first thought of a "fix" and I got this...

IMG_2351.JPG
IMG_2351.JPG (6.11 MiB) Viewed 5205 times

The image still seems to have some corrupt pixels.. but its not flicking corruption (might just be bad image data?)

.. and for the next step.. what value resistor pack do you have for P100 (just in front of the blitter)..?
https://www.exxosforum.co.uk/atari/ All my hardware guides - mods - games - STOS
https://www.exxosforum.co.uk/atari/store2/ - All my hardware mods for sale - Please help support by making a purchase.
viewtopic.php?f=17&t=1585 Have you done the Mandatory Fixes ?
Just because a lot of people agree on something, doesn't make it a fact. ~exxos ~
People should find solutions to problems, not find problems with solutions.
Strider
Posts: 5
Joined: Mon Mar 12, 2018 9:15 pm

Re: Video problem on STE

Post by Strider »

exxos wrote: Mon Mar 12, 2018 10:46 pm The image still seems to have some corrupt pixels.. but its not flicking corruption (might just be bad image data?)

.. and for the next step.. what value resistor pack do you have for P100 (just in front of the blitter)..?
Before modifying the PSUs I had those corrupt pixels. But never had the flicking corruption.

The P100 shows "M9-1-122J130" on one of my STE.
On the second STE the right part of the P100 is hidden by the blitter, all I can read is "MP-1-122J0.."
Some pictures:
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exxos
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Re: Video problem on STE

Post by exxos »

Strider wrote: Tue Mar 13, 2018 6:20 pm The P100 shows "M9-1-122J130" on one of my STE.
On the second STE the right part of the P100 is hidden by the blitter, all I can read is "MP-1-122J0.."
Some pictures:
Odd.. The macine I tested has corruption, but 10K pull ups, when UDS has 1K on it, the problem goes away.. so 1.2K you have should work..

I also found swapping the CPU for a 68HC00 also solved the problem , so you could try that ( cue bad DMA thread again :roll: )
https://www.exxosforum.co.uk/atari/ All my hardware guides - mods - games - STOS
https://www.exxosforum.co.uk/atari/store2/ - All my hardware mods for sale - Please help support by making a purchase.
viewtopic.php?f=17&t=1585 Have you done the Mandatory Fixes ?
Just because a lot of people agree on something, doesn't make it a fact. ~exxos ~
People should find solutions to problems, not find problems with solutions.
tzok
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Re: Video problem on STE

Post by tzok »

I don't have any corruption (no flickering, no corrupted pixels) on this demo, I have an MC68HC000FN16, and supposedly "bad" DMA (-38) in my STE with an early version (44th week of 1989) of C4003290 main-board. It has an additional silkscreen saying PCB C300779-001 REV 5.1 and this is the one with a factory "piggy-backed" 3rd 74LS164 chip.
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Re: Video problem on STE

Post by exxos »

ahhh, this was the thread I was talking about somewhere else the other day.. I don't think anyone with the corrupt pixels investigated it :(
https://www.exxosforum.co.uk/atari/ All my hardware guides - mods - games - STOS
https://www.exxosforum.co.uk/atari/store2/ - All my hardware mods for sale - Please help support by making a purchase.
viewtopic.php?f=17&t=1585 Have you done the Mandatory Fixes ?
Just because a lot of people agree on something, doesn't make it a fact. ~exxos ~
People should find solutions to problems, not find problems with solutions.
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