Recent content by jzmacdaddy

Success! It was the 40Mhz oscillator. It was outputting a strange waveform on pin 2 of UG8. I removed UG8 thinking it was the cause, but scoping out pad #2 on UG8 showed the same odd waveform. After swapping the oscillator from my donor board, I got a normal 40Mhz waveform. re-soldering UG8 and...

Thanks for the advice. I pulled all the transceivers and tested them with the Retro Chip Tester. All of them were good. No bad traces under the chips. I have not scoped any clocks yet, but I'll try that. The one board I have was remarkably clean, even before I cleaned it. The leaky caps caused...

I have 2 Mac II (820-0228-A) motherboards that will chime, but no video. I have cleaned and recapped both boards, as well as fix the usual bad traces between the VIA chips and the batteries. I'm using an original video card and matching monitor. I'm even using a recapped power supply. I've...

Is your power supply "shell" available for 3d printing?

The squiggly line stands for UM, and the CC is for Computer Center.

It’s a composite video port with a weird connector. I have one exactly like it.