Hello Steve, * On Tue, Nov 30, 2010 at 09:50:37AM -0800 Steve Gray wrote: > changing those will not make the device invisible. You could send a command to > make the device say 31 which most software would probably not support. Well, device 31 is *surely* not supported by *any* software. This device number is reserved and used for UNTALK and UNLISTEN. It is the only number that is reserved, everything else (0-30) can be used for IEC bus routines (although you have to use the IEC routines directly then, because the "normal" routines will shortcut addresses 0-3). Now, the 1541/1571 test for the UNLISTEN and UNTALK before they test for the LISTEN and TALK address (cf. $E884-$E8A7 in the 154x ROM). Thus, setting the device address to 31 effectively disables the drive's ability to react on a command on the IEC bus. Regards, Spiro. -- Spiro R. Trikaliotis http://opencbm.sf.net/ http://www.trikaliotis.net/ http://www.viceteam.org/ Message was sent through the cbm-hackers mailing listReceived on 2010-11-30 21:00:03
Archive generated by hypermail 2.2.0.