JoeB1355
Well-known member
I've been working on the this Galaga board on / off for 6 month or so. About a week ago I finally made some progress and got the video board working.
New RAM and Customs. I tested a bunch of customs that didn't disintegrate on a dig dug board i had that worked. solder pins etc.
All 2114's were bad (I bet someone put them in upside down!)
I checked all ROMS (burnt a couple new ones) and CPUs.
I checked all the sockets
CPU doesn't have the ceramic resistor packs
I have another Galaga board I tested the video on that worked
I tested the bad CPU on the good video -- so its definitely the CPU board
So I started with dead white screen I now have something that kinda boots and says it ok, but no cross hatch then reboots in a cycle forever.
Has anyone see the pattern in this video that could help?
Video: http://youtu.be/tAHzBaDE8-o
Anyone got an idea of where to go next? It looks to me like its not kicking over to the next CPU or something like that. The CPU's are good though and sockets looked and ohmed out from CPU pins to backside.
PS -- this was a junkboard that someone had already swapped bits etc and left for dead -- so quite likely there are multiple problems (I already found a couple!)
New RAM and Customs. I tested a bunch of customs that didn't disintegrate on a dig dug board i had that worked. solder pins etc.
All 2114's were bad (I bet someone put them in upside down!)
I checked all ROMS (burnt a couple new ones) and CPUs.
I checked all the sockets
CPU doesn't have the ceramic resistor packs
I have another Galaga board I tested the video on that worked
I tested the bad CPU on the good video -- so its definitely the CPU board
So I started with dead white screen I now have something that kinda boots and says it ok, but no cross hatch then reboots in a cycle forever.
Has anyone see the pattern in this video that could help?
Video: http://youtu.be/tAHzBaDE8-o
Anyone got an idea of where to go next? It looks to me like its not kicking over to the next CPU or something like that. The CPU's are good though and sockets looked and ohmed out from CPU pins to backside.
PS -- this was a junkboard that someone had already swapped bits etc and left for dead -- so quite likely there are multiple problems (I already found a couple!)
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