Offered to take a look at my buddies non-working Major Havoc boardset.
Hooked it up to my scope in XY mode. No picture (dot in center).
Had a SEEQ EPROM so replaced that. No joy.
Pulled the EPROMs. All verified.
Tested the CPUs and GAMMA tested bad. Replaced and we have picture! … but no sound...
An article written in 2022 (see link at bottom) seems to point to Venture Line or some other company being the originator of the hardware and software. I’ll quote the relevant paragraphs here:
Holniker had procured his PCB (printed circuit board—the “guts”/”brain” of any arcade cabinet—which...
I have 5 main boards and 2 audio boards
Mains: Qbert, Krull, and Curveball. All are working
Audio: Qbert with working SC01a, but the boards are no longer working (I was able to test the SC01as before my working audio board failed)
Thanks!
A fun time at CrabTowne. From left to right:
@tstone, Sam, @64B1T, @MajorHavoc, @mcdefjef
Hope to see @vintagegamer, @CharlieG, and others at a future gathering.
Game PCB: Major Havoc
Symptoms: flaking out and resetting (eventually in a constant reset loop of the startup explosion sound)
@64B1T stopped by to check out my MH in a Space Duel cabinet and after years of working mostly reliably, it decided that moment was the time to misbehave! We pulled the...
There are capacitors that look like resistors.
https://electronics.stackexchange.com/questions/202581/what-kind-of-capacitor-is-this-how-to-read-its-value-code#:~:text=The%20stripes%20on%20the%20capacitor,the%20final%20value%20in%20pF.