Am 10. Januar 2019 08:20:16 schrieb groepaz@gmx.net: > Am Donnerstag, 10. Januar 2019, 08:11:04 CET schrieb André Fachat: >> Am 9. Januar 2019 12:17:17 schrieb Francesco Messineo >> >> <francesco.messineo@gmail.com>: >>>> The major issue was actually the speed - not really of the bus but of the >>>> 1541 implementation with 6522 software workarounds making the bus look >>>> worse than it really was. Common thing was to add at least the parallel >>>> connection to 1541, bringing it somewhat closer to the original GPIB. And >>>> yes - it still allowed more than two devices and obviously not only the >>>> floppy drives. >>> >>> Yes, that was due to a bug in the 6522 chip. >> >> Never having fixed the shift register bug in the VIA 6522 e.g. in a new >> revision is my biggest gripe with MOS and Commodore. It would have made so >> many things so much easier. >> >> Well, that's history. Anyone know if there is a fixed CPLD/FPGA VIA? > > the CMOS versions (which are still available) have the external clocking bug > fixed, AFAIK Did they? Do you get them still? After sending I remembered the WDC but they are not plugin replacements as they have active IRQ drivers and need an extra diode. AndréReceived on 2019-01-10 09:01:16
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