Hi! > I already wondered how a SID behaves if clocked with the strange Phi2 > signal. > > If the divided MUX signal and the Phi2 signal are in phase, and the SID > chip select signal is gated with Phi2, it should work without any > problems. But without gating the chip select I almost can't believe it. I don't know if it's gated; the CS' logic is programmed into a GAL and I really don't know if it pays attention to sync with Phi2. [...] > Then probably a 6522 (probably only with some tweaking like in the C64) > and 6526 should also work, but perhaps with broken timers. ... Finally, I found a more obvious example that could be examined easier. This is the interface plug of the 1551 floppy drive. It is in fact a small interface card that connects to the expansion port, with a 6523 TIA that handles all tasks of data communication. The firm should have also solved problems (if occured) when designing this board. L. - This message was sent through the cbm-hackers mailing list. To unsubscribe: echo unsubscribe | mail email@example.com.
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