Hi All,
Two of the boards that I got the other day have the same error when booting, white border with black screen which is usually memory as you know.
Putting the diag cart into the board gives me the following error codes repeatedly
The vague description in the service manual says a data line is stuck. Do you guys have any idea whether this means its stuck in 1 or 0 state, as in faulty ram or maybe corroded contacts etc. In fairness, these two boards look pretty good, so I suspect I just have a dodgy ram chip.
I1 repeating error with Diag Cart
I1 repeating error with Diag Cart
If it ain't broke, test it to Destruction.
Re: I1 repeating error with Diag Cart
Id assume the 1 is the error, but never seen that screen before.
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 ?
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.
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.
Re: I1 repeating error with Diag Cart
It looks like its something to do with CAS not pulsing on the higher bank? CAS stays high all the time.
If it ain't broke, test it to Destruction.
Re: I1 repeating error with Diag Cart
If its a 16 chip RAM bank, then likely you have bad ram chip, whichever is going to bit 14 by the looks of 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.
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.
Re: I1 repeating error with Diag Cart
Ok, that explains the error message, cool, thanks for that exxos.
Now to track it down (well, maybe tomorrow anyway)
Now to track it down (well, maybe tomorrow anyway)
If it ain't broke, test it to Destruction.
Re: I1 repeating error with Diag Cart
Like exxos said: Probably the RAM chip for bit 14 is faulty. Other possible causes are the buffer (74xx244) or latch (74xx373) responsible for that bit. Due to the multitude of Atari board layouts it's not possible to give you the component designators, though. If in doubt, look into the schematic and trace it on the board.
Re: I1 repeating error with Diag Cart
Thank you, yes I've looked and just need time with the scope to verify which chips against the schematic.
All part of the learning process.
All part of the learning process.
If it ain't broke, test it to Destruction.