> Then explain me the $DE00/$DFFF trick of Marko :-) Explain it to me too. :-) By the way, a similar effect occurs also with the 1541 and with the VIC-20. Haven't you ever wondered why reading from a non-existing address returns the page number, e.g. reading from $20xx returns $20? Could it by any means have anything to do with the fact that the high-order byte of the address was on the data bus right before the read operation? :-) But why does it work? The VIC-20 and the 1541 have static RAM, while the C64 and the C128 have dynamic RAM, so that is not the explanation. Marko
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