yaryar
Well-known member
Warp Warp ROM 8 error still. What am I missing here??
Been messing with this PCB for too long now and I am completely out of options. Maybe someone here might have some advice. Here is the summary:
Received game, game played fine for a few hours. Turned it on the next day and it showed ROM 8. Here is what has been done so far:
1) Verified all voltages are good.
2) Pulled and verified all EPROMs against ROMIDENT.
3) For the hell of it, burned a new set of EPROMS, same issue
3) Verified activity on Address and Data bus lines, as well as /CS signal on the EPROMs.
4) Combined all 4 ROMs code into a single 128K EPROM, did a small reversible mod to the board to accomodate the 128K EPROM. I also lifted A12 and A13 from the CPU socket and ran bus wires straight from the CPU to the 128K EPROM, same error.
5) Went into the games code and identified where the program goes in the event of a ROM error, and blanked that out, burned that code to a new EPROM. Now the game will go past the self test and into the attract mode, but all that is seen on the screen is 'Player 1 Player2 and Credits'. The game hangs there. If I flip the self test switch on and boot the game up, the self test screen appears normal and you can move the joystick around for the joystick test, and the music test appears to work OK, but flipping the switch back to game mode yield the same frozen screen with Player 1, etc.
I really don't know what else to check at this point. I have a Fluke 9010 but no 8080 pod so I can't go from that angle. One thing I noticed is that the big square 15 watt resistor on the PCB gets red hot to the point where you can smell it, but since the voltages are all good, don't know if this can be related.
Any ideas or advice is very greatly appreciated.
Been messing with this PCB for too long now and I am completely out of options. Maybe someone here might have some advice. Here is the summary:
Received game, game played fine for a few hours. Turned it on the next day and it showed ROM 8. Here is what has been done so far:
1) Verified all voltages are good.
2) Pulled and verified all EPROMs against ROMIDENT.
3) For the hell of it, burned a new set of EPROMS, same issue
3) Verified activity on Address and Data bus lines, as well as /CS signal on the EPROMs.
4) Combined all 4 ROMs code into a single 128K EPROM, did a small reversible mod to the board to accomodate the 128K EPROM. I also lifted A12 and A13 from the CPU socket and ran bus wires straight from the CPU to the 128K EPROM, same error.
5) Went into the games code and identified where the program goes in the event of a ROM error, and blanked that out, burned that code to a new EPROM. Now the game will go past the self test and into the attract mode, but all that is seen on the screen is 'Player 1 Player2 and Credits'. The game hangs there. If I flip the self test switch on and boot the game up, the self test screen appears normal and you can move the joystick around for the joystick test, and the music test appears to work OK, but flipping the switch back to game mode yield the same frozen screen with Player 1, etc.
I really don't know what else to check at this point. I have a Fluke 9010 but no 8080 pod so I can't go from that angle. One thing I noticed is that the big square 15 watt resistor on the PCB gets red hot to the point where you can smell it, but since the voltages are all good, don't know if this can be related.
Any ideas or advice is very greatly appreciated.