Atari TT - Bus errors, advice needed! - SOLVED

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Atarian Computing
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Re: Atari TT - Bus errors, advice needed!

Post by Atarian Computing » Fri Aug 03, 2018 3:30 pm

Sketch (40).png
Sketch (40).png (1.01 MiB) Viewed 412 times
Ok, so we're looking for C218 and C220. So that tells me that they are (C)apacitors like exxos said and that they are most likely in sheet two of the schematics as they start with 2. Also, your picture shows the VGA connector in their vicinity and your problems were video related. So they should appear near the VGA port in the schematics. Plenty of clues.

So I've highlighted them on the sheet and they are 150pF, that's 150 pico farads. What you want is:

Ceramic Capacitor, 150pF, Through Hole, voltage whatever 50+, axial is better here because spacing
https://www.digikey.fi/product-detail/e ... -ND/818231

Edit: They are part of the circuit to pins 13 and 14 of the VGA, so horizontal and vertical sync signals.

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exxos
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Re: Atari TT - Bus errors, advice needed!

Post by exxos » Fri Aug 03, 2018 3:42 pm

:bravo:

So he probably killed the V&H sync by the looks of it..
4MB STFM 1.44 FD- VELOCE+ 020 STE - 4MB STE 32MHz - STFM 16MHz - STM - MEGA ST - Falcon 030 CT60 - Atari 2600 - Atari 7800 - Gigafile - SD Floppy Emulator - PeST - HxC - CosmosEx - Ultrasatan - various clutter

https://www.exxoshost.co.uk/atari/ All my hardware guides - mods - games - STOS
https://www.exxoshost.co.uk/atari/last/storenew/ - All my hardware mods for sale - Please help support by making a purchase.

Steve
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Re: Atari TT - Bus errors, advice needed!

Post by Steve » Fri Aug 03, 2018 3:55 pm

Omg thank you!!!! :)
Falcon ct60e 060 - 256mb ram - phantom bus and dsp accel // Atari TT - Thunder and Storm IDE 64mb ram - Lightning VME - USB LAN - Ati Mach64 2mb // Atari STM 4160 - 4MB ram - 16Mhz exxos 1.5 booster - Ultrasatan

Steve
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Re: Atari TT - Bus errors, floppy issues. PARTLY SOLVED ;)

Post by Steve » Sat Aug 04, 2018 11:36 am

Okay guys, I've finally put her back together. I seem to have solved my problems apart from that strange bus error in the system boot log in Mint.. but all programs and games seem to be running fine. So I am just guessing I might have a software issue rather than hardware. But that can wait another day.

Thanks again to everyone who helped, special thanks to Chris and Jish.
Falcon ct60e 060 - 256mb ram - phantom bus and dsp accel // Atari TT - Thunder and Storm IDE 64mb ram - Lightning VME - USB LAN - Ati Mach64 2mb // Atari STM 4160 - 4MB ram - 16Mhz exxos 1.5 booster - Ultrasatan

Atarian Computing
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Re: Atari TT - Bus errors, floppy issues. PARTLY SOLVED ;)

Post by Atarian Computing » Sat Aug 04, 2018 9:52 pm

Steve wrote:
Sat Aug 04, 2018 11:36 am
Okay guys, I've finally put her back together. I seem to have solved my problems apart from that strange bus error in the system boot log in Mint.. but all programs and games seem to be running fine. So I am just guessing I might have a software issue rather than hardware. But that can wait another day.

Thanks again to everyone who helped, special thanks to Chris and Jish.
Good to hear. That MiNT error is probably something I get as well on certain configurations. I know I signed off as "Jish" mistakenly but it's actually Josh, for Joshua 8-)

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Re: Atari TT - Bus errors, advice needed!

Post by Steve » Sun Aug 05, 2018 7:39 am

Final update:

My Mint related bus error was due to either wrong or corrupted Mint kernel or extensions. I re-copied the most important files over, now the bus error log is gone!

So in summary:
* The floppy issues were solved by installing the bus SIPS as recommended
* My cracked capacitors for the video output got replaced
* The Mint issue was software, not hardware

And during the process my TT got a lot of love. Brand new vme bus pal chips, vme bus fix implemented, entire motherboard re-capped, new system fan fitted, new floppy buffer chip.

Thanks again Chris and Josh :)
Falcon ct60e 060 - 256mb ram - phantom bus and dsp accel // Atari TT - Thunder and Storm IDE 64mb ram - Lightning VME - USB LAN - Ati Mach64 2mb // Atari STM 4160 - 4MB ram - 16Mhz exxos 1.5 booster - Ultrasatan

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Re: Atari TT - Bus errors, advice needed!

Post by exxos » Sun Aug 05, 2018 9:31 pm

Awesome, thanks for keeping us updated and glad you got it fixed! :cheers:
4MB STFM 1.44 FD- VELOCE+ 020 STE - 4MB STE 32MHz - STFM 16MHz - STM - MEGA ST - Falcon 030 CT60 - Atari 2600 - Atari 7800 - Gigafile - SD Floppy Emulator - PeST - HxC - CosmosEx - Ultrasatan - various clutter

https://www.exxoshost.co.uk/atari/ All my hardware guides - mods - games - STOS
https://www.exxoshost.co.uk/atari/last/storenew/ - All my hardware mods for sale - Please help support by making a purchase.

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