GOTTLIEB compatability system 80

wrongdon

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I have a GOLD WING pin which is system 80B and what i have are a few system 80A mpu's.Can i do any mods to the A mpu to run a B mpu game.I have the little adapter daughter card for socket U3 so that my roms physically fit,not sure if they work yet.All the boards need some level of repair as they have all been bench tested with leons test rom.My concern is with the display for one,system 80B has alphanumeric versus A has just numeric.I'd hate to get one running,plug it in and smoke the display or who knows what else.
Thank you for your input.
 
I have a GOLD WING pin which is system 80B and what i have are a few system 80A mpu's.Can i do any mods to the A mpu to run a B mpu game.I have the little adapter daughter card for socket U3 so that my roms physically fit,not sure if they work yet.All the boards need some level of repair as they have all been bench tested with leons test rom.My concern is with the display for one,system 80B has alphanumeric versus A has just numeric.I'd hate to get one running,plug it in and smoke the display or who knows what else.
Thank you for your input.

Yes, you can modify an 80A board to work in an 80B. Not a lot of changes but you do need to do them first before installing.
You MUST remove the 7448 display decoders/drivers (save them - very expensive) amongst other mods. I believe Clay has the differences mentioned at www.pinrepair.com but the site seems to be down right now.

Ed
 
I found this little tid bit on clays site.
"A fouth CPU board "D20869" was introduced with system80a, and used for system80b also. This board is the same as the D107 also, but it has socketed U2/U3 chips. Also the PROM2 game ROM socket was removed. With system80B, this board was used but some chips for the displays were removed and replaced with jumpers. "
This sounds like my boards,this is the first i have read that D20869 was 80B as well.I have no 7447's and there are jumpers in those locations.So i must have 80B's or the mods have been done already.
UGH now to dive back into these things,wish me luck lol.
Thank you for your help.
 
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