glenn@cs.utexas.edu (Gwangwu Lai) (03/07/90)
*jlb@aipna.ed.ac.uk (John Beaven) said: * *John> If I start up the machine and do DIR B:, I get the contents of *John> drive B: as expected. If I then change the floppy in drive b:, *John> and do DIR B: again, I still get the contents of the first *John> floppy, even though the light on the drive goes on and it looks *John> as if the machine is reading it. ... * *This is a long shot, but do you have either of the floppies in *question write-protected? I've had similar bizarre happenings like *that on an AT and that was why. Don't understand why, so don't have *an answer... The answer is that a DC (Disk Change) signal tells the controller if a new disk has been inserted into the drive. If this signal is somewhat screwed up, you end up with the symptom described above. Do a CTRL-C when you change disks; that should fix the problem (albeit a lousy fix). Glenn