modessitt
Volunteer: Encyclopedia Submission Moderator
...but apparently what I consider proper search terms produce no relevant results. And I know this has been discussed before.
Background: I have a cabinet with a unique harness (Cherry Master). I want to install a JAMMA harness without removing the original harness. I will be using separate power supplies - one to power the original game, and one to power the JAMMA games. I will be using the same monitor, speaker, and control panel for both. I will be doing this so my wife can still play the Cherry Master when she wishes, and I can swap in various horizontal JAMMA's for my arcade pleasure. I will be making a switch so that power can only be applied to either the Cherry Master or the JAMMA PCB - but never to both at the same time.
Q: Can I just connect both harness' video, speaker, and control panel wiring to the appropriate place (together) and have it work just fine, or will I need to do something like blocking diodes to keep signals from the powered board from going to the unpowered board?
Thoughts: The Cherry Master amplifies it's sound, as does the JAMMA PCB's, so the speaker doesn't need other amplification (such as with Nintendo or Atari PCB's). I don't know if a speaker signal from one PCB (or video or control panel voltage) going to the other unpowered PCB will cause damage to either, interference, or possible just make that feature not work at all. Obviously, if I need to use blocking diodes, I will need to put them on both harness. And if so, what's a good docking diode to use that is fairly plentiful and cheap?
Background: I have a cabinet with a unique harness (Cherry Master). I want to install a JAMMA harness without removing the original harness. I will be using separate power supplies - one to power the original game, and one to power the JAMMA games. I will be using the same monitor, speaker, and control panel for both. I will be doing this so my wife can still play the Cherry Master when she wishes, and I can swap in various horizontal JAMMA's for my arcade pleasure. I will be making a switch so that power can only be applied to either the Cherry Master or the JAMMA PCB - but never to both at the same time.
Q: Can I just connect both harness' video, speaker, and control panel wiring to the appropriate place (together) and have it work just fine, or will I need to do something like blocking diodes to keep signals from the powered board from going to the unpowered board?
Thoughts: The Cherry Master amplifies it's sound, as does the JAMMA PCB's, so the speaker doesn't need other amplification (such as with Nintendo or Atari PCB's). I don't know if a speaker signal from one PCB (or video or control panel voltage) going to the other unpowered PCB will cause damage to either, interference, or possible just make that feature not work at all. Obviously, if I need to use blocking diodes, I will need to put them on both harness. And if so, what's a good docking diode to use that is fairly plentiful and cheap?

