billm@ccicpg.UUCP (Morita Bill) (08/12/88)
I am having trouble converting an old IBM-XT from a configuration of a single floppy (360k) and a single hard disk (20 Mb). The configuration I originally had worked fine until the full height IBM floppy drive died. I replaced it with two Tandon half-height floppies (model 50-2). The floppy controller is some unknown manufacture (I can't find any markings on the board). The cable is the type with the "half-twist". I have terminated things according to the instructions recieved with the drives. The problem is this: Only ONE drive will work, e.g. the first drive (the "a:" drive). Both floppy drives function correctly when placed in the "a" drive position on the cable. The cable checks out in that I can plug it in swapped end-for-end and the "a" drive functions correctly. The only conclusion I can come to is that there must be some hardware change necessary. Like a DIP switch on the floppy controller or the mother board. None of the software can "see" the second drive. Maybe I need a new BIOS ROM??? Any help that anyone can give me would be much appreciated. Thanks (in advance) Bill Morita
cnee@wright.EDU (Cheng-Lee Nee) (08/14/88)
in article <19592@ccicpg.UUCP>, billm@ccicpg.UUCP (Morita Bill) says: > References: > > > The problem is this: Only ONE drive will work, e.g. the first drive > (the "a:" drive). Both floppy drives function correctly when placed > in the "a" drive position on the cable. The cable checks out > in that I can plug it in swapped end-for-end and the "a" drive > functions correctly. The only conclusion I can come to is that > there must be some hardware change necessary. Like a DIP switch > on the floppy controller or the mother board. None of the software > can "see" the second drive. Maybe I need a new BIOS ROM??? There is a bank of DIP switch on the XT motherboard. The switch 7 & 8 are for number of floppy drives installed. The settings are as follow: 7=on 8=on 1 drive installed 7=off 8=on 2 drives installed 7=on 8=off 3 drives installed 7=off 8=off 4 drives installed Just change the switchs and DOS will recognize the drive B: Cheng-Lee Nee