I have a pc10 motherboard thats stuck in a CPU/PPU reset loop (watchdogging)
It makes it a pain to troubleshoot so I was wondering if there are any known ways t odisable the watchdog?
There are som jumpers and whatnot at the NMI and some other place close to PPU & CPU but I am not sure what they do.
I attached the schematics also.. Any tips are welcome!
PPU, CPU, Z80 + all roms/bios are swapped with a known working board, they are all good.
Crystals are good/dividers too
Could not see anything stuck at neither cpu nor ppu.. but its a pita when everything is razy pulsating in rythm with the WD..
PPU/CPU srams are desoldered and tested OK, buffer 1K was bad, and is replaced. (74LS245)
The powersupply and jamma adapter works great with the other working copy of the pc10 mobo, (both dual monitor mobos)
Bah, schematics was to big to attach..
http://playchoice.riemen.net/downloads/manuals/pc10_Schematics.pdf
Thanks in advance!
It makes it a pain to troubleshoot so I was wondering if there are any known ways t odisable the watchdog?
There are som jumpers and whatnot at the NMI and some other place close to PPU & CPU but I am not sure what they do.
I attached the schematics also.. Any tips are welcome!
PPU, CPU, Z80 + all roms/bios are swapped with a known working board, they are all good.
Crystals are good/dividers too
Could not see anything stuck at neither cpu nor ppu.. but its a pita when everything is razy pulsating in rythm with the WD..
PPU/CPU srams are desoldered and tested OK, buffer 1K was bad, and is replaced. (74LS245)
The powersupply and jamma adapter works great with the other working copy of the pc10 mobo, (both dual monitor mobos)
Bah, schematics was to big to attach..
http://playchoice.riemen.net/downloads/manuals/pc10_Schematics.pdf
Thanks in advance!