On 3/30/2022 4:46 AM, smf wrote: > The TIB drive uses DMA though > > https://github.com/sjgray/TIB-001-Cart > > You would need a "Goldstar GM82C765B FDC chip", or clone it with a > CPLD/FPGA. > > I'm not sure how many people would actually want a TIB drive though.... > > On 28/03/2022 16:27, Gerrit Heitsch wrote: > >> No, not using DMA, just a different I/O-port. That adapter you plug >> into the plus/4 contains a PLA (251641-03) and a 6523T (6525 in >> 28pin). There is no DMA involved. >> > The IC supports DMA, but does the cart design actually use it? 808X DMA is markedly different in operation than C64 DMA, and I don't see enough logic on that board to glue the two concepts together. It looks like polling mode is used. Jim -- Jim Brain brain_at_jbrain.com www.jbrain.comReceived on 2022-03-30 18:00:07
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