Hallo Richard, > I think Bil means the address multiplexors inside the C64; the ones that > connect to the DRAMs. If the CP/M cartridge somehow fiddles with the > address lines at some cycle when it's not supposed to (eg. the DRAM > refresh cycles) then this could certainly cause problems. Perhaps the Z80 > doesn't get tristated off the bus *quick*enough*, and this leads to > problems when the next cycle on the 6502 bus is a refresh cycle. Possibly. As I already said, there are 3 245-buffers and 1 373-buffer between the Z80 and C64. And the 245's are steered by CLK2 thru a 3-NAND-input. The 373 is steered by the DOT-clock and that's my mistake I think. Writing this the thought occured if it is not my mistake, then you could have a good cause for trouble. Lets hope I'll find my module quickly enough. Otherwise I only can ask you, or who ever has one as well to check this particular line. Groetjes, Ruud - This message was sent through the cbm-hackers mailing list. To unsubscribe: echo unsubscribe | mail cbm-hackers-request@dot.tcm.hut.fi.
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