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This is worth following as a line of enquiry. has the rottendog board in this game got a similar issue?I once had a load of fun with a Rottendog MPU4 in a Sega Maverick pinball, rare random resets and no memory saving at all. The board had an STK12C68 nvRam installed but seemed to be an early revision PCB and not wired correctly for that particular chip, it seemed like it was wired for the 62256. Can't remember exactly what the modifications were but I cut a couple of traces, added a capacitor and jumpered some wires to fix the issue.
Found there were others posting about issues with Rottendog boards and the memory backup system on Pinside, so there's a bit of strangeness going on out there!
Unfortunately the original MPU was acid damaged beyond repair and I dint have any others.Can you swap in a known good board ? Isolate your problem that way. This would be my first move.
Failing that, I'd take it to Andy Netherwood. He has the OEM bench tests for System 11 boards.
I have experience of Rottendog. On my TZ it was slower at triggering the power ball diverter at the top. A Rottendog fliptronic board also failed in the same machine. I replaced both with proper Williams boards.
I don't trust Rottendog and would rather have a repaired Williams board.
Cheers Alan. Thanks for persevering with me/it! I am gonna have a look at the board again tomorrow as I am convinced it must be that at fault since as I have unplugged every board that is connected to MPU at one time or another during these diagnostics and nothing’s fixed it.Had a bit of time today to look at the rottendog board design, starting point was to figure out where the blanking led is controlled:
heres a bit of the schematic:
View attachment 233347
D34 is the blanking led - /Y3 inverted from A3, fed from a line called RA19_8 - that connects to a resistor array #19, pin 8. That resistor array holds lines high at +5v. On the rottendog schematic, nothing else is connected to RA19_8 line????? than means the led would always be lit. I conclude the schematic is incorrect! ****ing great help rottendog.
Link to schematic:
I might be wrong but ive scoured the schematic for anything else that connects, cant see anything.
trim post are to balance the speech and sound, so no need to mess with those.Cheers Alan. Thanks for persevering with me/it! I am gonna have a look at the board again tomorrow as I am convinced it must be that at fault since as I have unplugged every board that is connected to MPU at one time or another during these diagnostics and nothing’s fixed it.
The documentation/support around this £500 plus board is diabolical.
I’ve found a jumper on it that appears to do nothing. Couple of trim pots that appear to do nothing. No manual that tells you what the pots do or what the jumper is for. Ridiculous!
No idea mate - the pins go horizontal - the labelling goes vertical. I have tried it in both positions and off completely. Nothing doing.which is jumped W8 or W9 or both or neither - cant see from the pic
on other revisions of that board I think: W9 for Sys 11 games, W8 for sys 9 games
Also - you have 2 6802/08 processors on that board - try swapping those 2 chips one might be faulty - so a free, easy thing to try.