Re: U0>M1 on the 1571

From: Ruud Baltissen (
Date: 2001-10-17 07:14:39

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

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?
  / __|__
 / /  |_/     Groetjes, Ruud
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