Help with my Joust

wolfeman

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1st a huge thanks to douglasgb who has helped me immensely.
I wanted to leave him alone for a bit. So I got this Joust. Thought it was dead, never plugged it in until last night. And it powered on. Lights on no sound, but power...

So I have been texting douglasgb last night and tonight. He had me reseat the ROMS and I did that but now my screen looks like this in the pictures. Not sure what to do next. Please help I don't want to keep bothering Doug..
 

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then the rom is bad. I don't think they're checked in numeric order, so they're kinda backwards like the ram test that does bank 3 first. I don't remember which rom would come up if there was a catastrophic failure of the roms like the ram 1-3-1.

the good news is the cable and MPU are both good. there's an outlying possibility that the PIA is bad as well, but I think the rom errors would be random.
 
i would purchase a used Fluke 9010a for around $300-500 (maybe more)

and try to acquire the holy of holiest grails, the 6809 pod (they run $600-2000 easily)

then troubleshooting that pcb is like a piece of cake

u can troubleshoot all the 6809 cpu based pcb's and become the arcade fixit king!
 
carefully lift each rom (or at least rom 1 and test) a little in its socket (dont remove it, just crack it loose a little on each end, then push it back in tight while supporting behind it

And check your voltages at rom and cpu board

Also reseat/push down on the ribbon connector between them

No luck? Pull rom 1 and compare its contents to mame if you have a rom burner/reader
 
contact cleaner in the sockets will help. also verify that the rom 1 legs aren't corroded.
 
If you do indeed have a bad ROM, take note of what type of ROM label you have (if they are still the originals.)

For Joust, there's:
White/Red Label version ROMS
White/Green Label version ROMS
Solid Blue Label version ROMS

Just FYI...
 
Also, usually hand written in I believe is usually an A or B after the ROM #.... this refers to a 2732 or 2532 EPROM IIRC. Someone correct me if my memory is off please.
 
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