Hi Nicolas, > I remember that one approach was to delay Phi2 with an LS74 flipflop by one > dotclock cycle, but I'm pretty sure that the 6821 does not need this delay. I > have a few 6821 expansion port circuits (like IEEE488 interfaces, or the > Formel 64 module, the Prologic DOS expansion port interface, the Quickbyte II > Eprommer) and none of them uses a clock delay. that's exactly what that article said: While in theory, one has to delay PHI2 for these chips, it is not necessary in practice. I think that article said that *every* member of the 65xx/68xx series not specifically designed for use in a C64 would suffer from that problem. So, in fact, the 6510, 6526, 6581, 6567/6569 would not be *real* members of the 65xx family. Anyway, I never have done tests with that. Spiro. - This message was sent through the cbm-hackers mailing list. To unsubscribe: echo unsubscribe | mail cbm-hackers-request@dot.tml.hut.fi.
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