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? ___ / __|__ / / |_/ Groetjes, Ruud \ \__|_\ \___| http://Ruud.C64.org Message was sent through the cbm-hackers mailing list
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