Re: Did Commodore cheat with the quad density floppies?

From: André Fachat <*afachat_at_gmx.de*> Date: Thu, 10 Jan 2019 08:11:04 +0100 Message-ID: <16836999f40.27ff.b4d1f2b66006003a6acd9b1a7b71c3b1@gmx.de> · afachat_at_gmx.de

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?

André