dlarsen@blake.acs.washington.edu (David Larsen) (10/24/89)
I have an ATT PC6300 with a dead floppy controler. I have been trying to work around this using another floppy controler with no sucess. I seem to remember that someone posted a file on how to use other controlers in these computers. If someone with that document or someone that might know a work around I would be greatful for advice. David Larsen dlarsen@blake.acs.washington.edu
psfales@cbnewsc.ATT.COM (Peter Fales) (10/28/89)
In article <4176@blake.acs.washington.edu>, dlarsen@blake.acs.washington.edu (David Larsen) writes: > I have an ATT PC6300 with a dead floppy controler. I have been trying to > work around this using another floppy controler with no sucess. I seem > to remember that someone posted a file on how to use other controlers > in these computers. If someone with that document or someone that might > know a work around I would be greatful for advice. I am operating somewhat from memory here, but I am pretty sure this is correct: When the 6300 accesses peripherals that it thinks are on the system board (like the floppy controller), the signals are not sent to the expansion bus. There is a PAL which determines what address ranges are mapped to the system board. This is a 20 pin device in a socket next to the two EPROMs on the system board. Lifting pin 17 will disable the system board controller and allow access to an external floppy controller. Be careful not to break the pin - the PAL is difficult or impossible to replace. -- Peter Fales AT&T, Room 5B-420 2000 N. Naperville Rd. UUCP: ...att!peter.fales Naperville, IL 60566 Domain: peter.fales@att.com work: (312) 979-8031