Hallo Spiro,
 

> Measured with VICE (empty disk):
>
> - $F4ED-$F4F0 (GCR -> binary): 22.890 cycles
> - $F586-$F589 (binary -> GCR): 22.693 cycles

This is a bit more then 3 sectors, take 4 for safety. Means we need 6
revs/sector -> 1 sec/track -> 35 seconds for reading the complete disk.
Not bad, certainly much better then three minutes.


> The 1571 has different routines ......

YES, this is the kind of info I'm looking for! I didn't know at all that
the 1571 used this trick. I already was looking for the same thing as
the old IEEE drives do about the same using this GCR-ROM. But now you
save me a look of work, many thanks !!!


--
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