Re: Did Commodore cheat with the quad density floppies?

On 1/10/2019 12:40 PM, Mia Magnusson wrote:
> Den Wed, 9 Jan 2019 12:52:46 +0100 skrev Francesco Messineo
> <francesco.messineo@gmail.com>:
>> see how they did the "burst mode" between 1571 and C128. On the 1571
>> there's an additional 6526 with only two pins used, they didn't even
>> bother to substitute one of the 6522.
> That was surely done to make the 1570/1571 as compatible to a 1541 as
> possible, to make for example copy protection work better.
>
>
>
As I recall, tho, they used all of the previously free 6522 IO pins, as 
the parallel cable on a 1571 has to be put on the 6526...

Jim


-- 
Jim Brain
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www.jbrain.com