Anyone know why all of a sudden my P1 Start button thinks it is the Exit button all of a sudden?
You may find that a keyboard tester program is useful for troubleshooting this issue.
1. Is there a short between the P1 Start and Exit input wires?
- Do a resistance/continuity check between those IPac inputs -- with power off, of course -- it should read as open/no continuity.
2. Was the Exit button (UI Cancel) remapped in the MAME "Input (general)--User Interface" menu?
3. Is P1 Start somehow triggering the P1 Start + P2 Start = Exit shifted function?
- Probably won't be a constant ground applied to P2 Start input due to the way shifted functions work.
- You can test this possibility by disconnecting the P2 Start wire at the IPac.
-- If P1 Start still behaves like the Exit button, you can eliminate shifted functions.
-- If P1 Start doesn't behave like the Exit button, there could be a short that triggers shifted functions.
Scott