Re: 8520

From: Richard Atkinson (
Date: 2000-08-01 23:50:45

On Tue, 1 Aug 100 wrote:

> > 8520 has clear differences in the software model (no TOD clock) and does
> > not concern us here.
> A friend of mine succeeded in ataching several PC 720KB-drives to 1581. The 
> 8520 is the only IC in the design you cannot buy in a shop. So for this reason 
> we are interested:
> - in what way a 8520 differs from a 6526
> - does the software use the difference
> - can the software be altered to use an 6526(A)

Sorry, Ruud, I forgot about the 1581. You're absolutely right.

Speaking of which, can either the 1581 or CMD FD-2000 use more than one
disk on the shugart bus? Apparently it was specified for up to four
devices, but IBM only ever used two.


Richard Atkinson
Software Engineer
Tenison Technology EDA Ltd

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