Here's what your clock should look like... from Sys80 Service Manual

sys80_clock.jpg

Z3 - pin 6 about 3,6MHz and at Z2 - pin 9 about 900 kHz

Heh, I prepaired answer at "page 1".... woz, yours "pictures" are much better

Yes, it's logical to change Z3.... but BEFORE, just check +5V on Z3 & Z2 ( literally ON pin 7, and vs 14 )

Oh man...looks like it's my turn to have my work cut out for me. Maaaaybe I'll find another sys 80b mpu in good working order to try out. But I'm stubborn and cheap so we shall see. Reading this thread kinda bums me out that you sold it to me. I feel like you were so close.

Just single "little" notice about Z3.... it MUST be 7404, not (maybe ) "handy" 74LS04 !!!

That's right cro, timing is everything with that 7404.

Steve

Yes..."first time" I was surprised....a LOT )

I take it you eventually gave up on the game since it appears I purchased this mess a few days ago I found a few problems, the driver board had the ground mod hooked to the +5VDC, this was pulling down the logic voltage when the driver board was plugged in, surprisingly it didn't blow the regulator or fuse. I also discovered there was 11 broken traces on the component side of the circuit board under the piggyback board (6 data line, 3 address lines and both CS lines weren't getting to the EPROM). After connecting the broken traces the game booted perfectly, but no sound! Still haven't figured out the sound issue, I have replaced both CPUs and put sockets on the board. I also checked every IC to make sure no inputs or outputs were shorted, this can be done by removing the board and placing your DMM on diode setting, attach the red lead to the logic ground and then use the black lead to test each pin (not the ground or +5VDC) you should get a reading between 0.1 - 0.7, but if it's shorted check to be sure it's not intentionally tied to ground or +5VDC, as well make sure it's an output and not an input or you might be changing the wrong IC.

Looks like one or more of the sound board EPROMs are most likely at fault since all the circuitry seems to check out.

Those red flash lamps covers are sure melted in the back of the playfield. Too bad the top of the head has some water damage.

Wish me luck.

Good luck Evan. I'm glad I didn't mess with it much and left it to you!

You can't even see the top of the head, and this is Goldwings we're talking about here, lets not get crazy! That's what happens when cabinets are built with pressboard.

Come by anytime to help me with my Jungle Lord woes. I'll buy the beer.

Good work !!!
There was lot of problems,piggyback work isn't easy.
After all I have no doubt in "happy end" for this pinball )