Re: Did Commodore cheat with the quad density floppies?

From: groepaz_at_gmx.net
Date: Thu, 10 Jan 2019 08:17:50 +0100
Message-ID: <2556395.JrzZx9aGIl@rakete>
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

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Received on 2019-01-10 09:00:50

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