Joist 2/ Mystic Marathon/ Inferno 4164 conversion

Thanks for the update. I have been trying to get some time to look closer at the schematics, but I have been crazy busy at work and keep getting boards sent to me for repairs.

The custom chips on the Joust 2 boards do look like they just got the foundry to combine the shift registers into a single chip. I know they were looking at doing some custom IC work around the time that I left. I vaguely remember Don had mentioned that they found a chip foundry in Indonesia or Singapore that they were working with on for some large scale integrations. I am not sure what the difference between the original DMA chips and the second generation were, but the DMA chips on the gen 3 boards (MM, Joust2, etc.) came from that foundry.

ken
 
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