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Double check the obvious first, that was MY mistake when my Millipede displayed garbage. The cause of my garbage screen was.....sigh....a disconnected wire that used to go to something on the coin door that had decided to rest on the coin mech frame, grounding out. The shame, especially after...

My Tapper has a slight shake as well, but I don't care at this point as it was a complete resurrection and I'm done doing anything else to it, alcohol helps not notice it 😄

Yup, along with socket issues and a few bad Z80's.....but AFTER that, it was a reset signal issue between the two. My memory is bad, and I took in a lot of information on the phone call, but "Gal" issue was mentioned.

Final update (Hopefully).... Kit is now functioning 100%! Thanks again to Highscoresaves for coming through! Apparently "some" Tapper MCR stacks are different so communication from the CPU PCB and SSIO was different on mine (and one other customer so far). He mailed me a new IC for the CPU...

I don't even bother anymore, I mount a Walmart LED under counter light instead in all my games now and slots (and redemption for that matter). They basically last forever, are cheap, run cool so they don't burn/crack marquees/belly glass etc. The replacement fluorescent bulb is more expensive...

Okay, again, working perfectly fine in its original state, issue only arises when the multi kit is installed. Same results with either the newly rebuilt original ps or with a switcher and the adapter. With the kit installed, there is 5v on pin 26 (reset) of the SSIO Z80..power game down, power...

Another update: Got it working 100% this morning with the multi kit removed, the "no sound" issue returns when the multi kit is reinstalled. Swapped between stock and multi kit so many times this am, I lost count. With the kit it loses sound after you power down the game and power it back up...

Update: Had CDJump (Chris) go over the stack again and had him rebuild an original linear ps for me. It's still doing the same thing. I did find if I disconnect the IDC connector or molex on the other end of it going to the ps, then reconnect it and power on, sound returns. So the issue, as...

Yup, I've been messaging him.

Well, new interconnects installed, A5 on SSIO pcb replaced and socketed. Also changed the Z80 again for the hell of it ....Zero change. Shoot me

Well, figured out the 4 ohm 8 ohm difference. 4 ohm speakers appear to have been used on the early System 1 builds with the Audio III PCBs, 8 ohm on the later Audio II PCBs. Interesting Atari design chat here about it: https://atariemailarchive.org/thread/the-proposed-regulator-audio-iii-80

Gave up, ordered these...

Yes, boardset was fine until I installed the kit. I don't believe the kit caused it, more so just a coincidence that either a component failed or something didn't like being touched.

I have spoken to him, he suggested new ribbon cables and replace the 74LS374 on the SSIO (both ordered).

Just ordered

Okay, Rom Error corrected.....Game works, still no sound (so wasn't the kit). I see "Sound board interface error" on boot into "Test" (Test switch and credit button work again, kit must deactivate them?). Ran Sound test, nothing.

Okay, kit removed, everything back to original....Now "Rom Error 3C", where can I download the rom to burn?

Thanks, just tried it four times, nothing. Just pulled the stack, going to revert back to original and remove the kit.

Checked it with a DMM, works as it should, and shorted the wires just in case, still nothing.

I know, I can't get into it because my test switch doesn't do anything (tested switch and wiring)