Hi guys,
In my attempts to upgrade the motherboard from 1 to 4 mb using an exxos I resulted in creating an Atari ST that provides a black screen when booting.
From this state I have soldered in sockets at the first rows of ram for further diagnosis. I am using RAM simms that I have succesfully tested using Yaart on another machine.
During bootup, I get a black screen:
When using the diag cartridge, I have the following screen:
With the following output over RS232; wich are a combination of
I1 RAM/data line errors and
I2 RAM disturbance errors
My first intended step is to consult the motherboard schematics to see if I can figure out if I can start testing continuity for all the related connected pins of the soldered in sockets.
I have no clue as to how to meaningfully interpret the Diagnostics cartrdige output to narrow down/focus/validate more specifically than mentioned approach. I would be oblidged to get pointers and feedback on my exploration .
Kind regards,
Wietze
<edit> my current `diagnostics tools' consist of the cartridge and a multimeter.
Dead Atari STF - C070789 - 002 Rev.D
Re: Dead Atari STF - C070789 - 002 Rev.D
Looks like bits 8 & 10 are bad. So if you trace on the schematic where D8 & D10 goto which chip and resolder 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: Dead Atari STF - C070789 - 002 Rev.D
Thank you for your reply. How did you determine that bit 8 and 10 are bad? Id like to understand this.
In the meanwhile, I checked connectivity on all the soldered lines, by checking connectivity of the pin on corresponding pins on different sockets and unsocketed pins on the other rows. And from this I conclude that at least all pins are connected / the sockets are connected up with the board. I will see if I can trace the pins into the rest of the board; checking for continuity.
Re: Dead Atari STF - C070789 - 002 Rev.D
Just count the bits https://www.exxosforum.co.uk/forum/viewt ... 143#p47751
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: Dead Atari STF - C070789 - 002 Rev.D
See troubleshooting help.
But it look like bit 8 and 11. So after looking at schematics it is U44 and U27.
EDIT: @exxos beat me to it.
But it look like bit 8 and 11. So after looking at schematics it is U44 and U27.
EDIT: @exxos beat me to it.
Re: Dead Atari STF - C070789 - 002 Rev.D
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: Dead Atari STF - C070789 - 002 Rev.D
Awesome guys! Thanks. Just to apply this knowledge (after reseating the simms):
So i ran the diagnostics a bit longer, just to see if I could make sense of it. And from the following shot I deduce:
D12 (from first line)
D9 and D8 and D2 (from second line)
D7 (from 4th line)
D14 (from last row)
These I1 errors come steadily after a bunch of I2 RAM Disturbance.
Is detecting errors in memory for I1 and I2 messages the same?
So i ran the diagnostics a bit longer, just to see if I could make sense of it. And from the following shot I deduce:
D12 (from first line)
D9 and D8 and D2 (from second line)
D7 (from 4th line)
D14 (from last row)
These I1 errors come steadily after a bunch of I2 RAM Disturbance.
Is detecting errors in memory for I1 and I2 messages the same?
Re: Dead Atari STF - C070789 - 002 Rev.D
To be honest, if I run the diag cart for longer, it seems that almost all D lines are bad. There is literally lines that are 16 times 0, followed by 16 times 1; but these do not show consistently. (e.g. for reach 16 0's entry a different mask of 01 combinatios are shown per line).
Re: Dead Atari STF - C070789 - 002 Rev.D
If your getting random bit errors, then it can be bad RAS/CAS lines or bad address bit...
I fell victim of that recently... https://www.exxosforum.co.uk/forum/viewt ... 670#p37284
I fell victim of that recently... https://www.exxosforum.co.uk/forum/viewt ... 670#p37284
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.