On 6/30/2022 1:33 AM, Baltissen, GJPAA (Ruud) wrote: > Hallo Jim, > > >> Wouldn't that just be the falling edge of PHI2? Maybe I misunderstand. > If a device accesses the C64/128 somewhere after the rising edge of PHI2, there is no guarantee that data has been written well or the read data is indeed the correct one. That's why I advise to check for a rising edge first. (and check BA as well, of course) Hmm, your statement was: "One thing you can do is to dream up a circuit that halts whatever wants to access the C64/128 until a _complete_ top half of PHI2 has been detected" To me, that means stopping until PHI2 has went high *AND* went low, as only those two events signal that a complete top half of PHI2 has been seen. But, if that's what you want, then triggering on the falling edge seems enough. (and yes, checking BA is needed as well). JimReceived on 2022-06-30 11:00:02
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