Hallo Nick,
> it seems to hold all lines (ATN, CLK and DATA) low whilst....
I wasn't able to do any measuring. IMHO I don't see any reason why it should
do it at all; the 1571 just risks frustating any communication between other
devices.
To be sure I checked the SRC. The actual routine starts at $8FFD
(ROM-version 03, Data Becker) where it checks wether it is "M0" or "M1".
Both routines do nothing at all with port B of the $1800-6522 (AFAIK).
So what gives you the idea it does negate the lines?
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/ / |_/ Groetjes, Ruud
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\___| http://Ruud.C64.org
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