Galaxian ROMS issue

Dlsmith

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I have 2 Galaxian PCBs. One working, one not. The one that is working has the 9316B Roms.
The one this isn't has 2716.

I believe that it is a graphic ROM issue, when I installed the 2716 on the working board, the graphics were not working. So I read the two (1H & 1K) 9316B and then burn them to a set of 2716s.

When I installed the new programmed 2716s on the working board, I got the same screens as when I had the original 2716s.

I have read online that the 9316B are compatible with the 2716. But I'm not sure.

Any Ideas?
 
Thanks,

I thought about changing the sockets out, but when I put the 2716's on my good board, I still get garbage.

Really odd that I took the program code off my good Mask Proms (9316B) and write it to new 2716's and the 2716's give me a garbage screen while the 9316's works fine.

Thinking about checking my Vpp when I wrote the 2716's.


Thanks,
David
 
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