Am Donnerstag, 10. Januar 2019, 08:26:16 CET schrieb André Fachat: > 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. perhaps, i dont know. i dont trust CMOS replacements of NMOS parts at all, so never looked closer :) -- http://hitmen.eu http://ar.pokefinder.org http://vice-emu.sourceforge.net http://magicdisk.untergrund.net I love my country... but I fear my government!Received on 2019-01-10 09:01:42
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