Hi,
I have 5160 XT. It has a 256-640K system board (late model 4/86 BIOS). I want to have a high density 1.44MB 3.5” floppy drive as A: that is bootable. Also, too often, I come across applications that insist on installing from A: and no other drive. I am using DOS 6.2 BTW.
I have a Mini Micro FDC PII-151B high density floppy controller with its own BIOS. I removed the original floppy controlled and put this one in, but not before setting the jumpers so that there would not be any memory conflict. I have two half-height drives, one (for the A: drive) of them is a Teac 1.44 3.5” 235-HF drive with no jumper on the drive, the other is a half-height 360KB 5.25” drive.
Both drives work, but the 1.44 drive will not read 1.44 disks, it will only read, write, and format 720K disks.
I set the jumpers for the drives as follows – carefully following the original OEM installation manual for the card that I have in addition to the following online doc: http://museum.ttrk.ee/th99/i/C-D/50286.htm
• The card BIOS is enabled for use in a PC/XT (JP5 closed).
• There are 4 pairs of pins on Jumper 3, the first two pairs are for Drive A, the second two pairs are for Drive B. I made sure the first two pairs were open for 1.44M operation. I closed both pairs 3 and 4 for Drive B: for 360KB operation.
• As far as I can tell, there are no memory address issues – I tried all three suggested addresses ad none of them resulted in memory address conflicts.
• On the system board there is only one set of rocker switches and I set them SW7 and SW8 on as documented, any other combination results in 601 boot errors.
• I do have an InBoard/386 PC adapter and don’t know if that is involved. I read that the Inboard uses the original XT BIOS to boot initially. I also have an AboveBoard PC and also an XT-IDE CF drive.
Any insight on why the Teac 235-HF 3.5” drive isn’t reading 1.44MB floppies and only 720KB floppies? I throught that having a high density FDD controller with its own BIOS should make the 1.44MB drive able to read/write to 1.44MB and not just to 720K disks - ut after going over and over it - and trying every different variation on Jumper 3 - I'm stumped.
Regards,
Mike
I have 5160 XT. It has a 256-640K system board (late model 4/86 BIOS). I want to have a high density 1.44MB 3.5” floppy drive as A: that is bootable. Also, too often, I come across applications that insist on installing from A: and no other drive. I am using DOS 6.2 BTW.
I have a Mini Micro FDC PII-151B high density floppy controller with its own BIOS. I removed the original floppy controlled and put this one in, but not before setting the jumpers so that there would not be any memory conflict. I have two half-height drives, one (for the A: drive) of them is a Teac 1.44 3.5” 235-HF drive with no jumper on the drive, the other is a half-height 360KB 5.25” drive.
Both drives work, but the 1.44 drive will not read 1.44 disks, it will only read, write, and format 720K disks.
I set the jumpers for the drives as follows – carefully following the original OEM installation manual for the card that I have in addition to the following online doc: http://museum.ttrk.ee/th99/i/C-D/50286.htm
• The card BIOS is enabled for use in a PC/XT (JP5 closed).
• There are 4 pairs of pins on Jumper 3, the first two pairs are for Drive A, the second two pairs are for Drive B. I made sure the first two pairs were open for 1.44M operation. I closed both pairs 3 and 4 for Drive B: for 360KB operation.
• As far as I can tell, there are no memory address issues – I tried all three suggested addresses ad none of them resulted in memory address conflicts.
• On the system board there is only one set of rocker switches and I set them SW7 and SW8 on as documented, any other combination results in 601 boot errors.
• I do have an InBoard/386 PC adapter and don’t know if that is involved. I read that the Inboard uses the original XT BIOS to boot initially. I also have an AboveBoard PC and also an XT-IDE CF drive.
Any insight on why the Teac 235-HF 3.5” drive isn’t reading 1.44MB floppies and only 720KB floppies? I throught that having a high density FDD controller with its own BIOS should make the 1.44MB drive able to read/write to 1.44MB and not just to 720K disks - ut after going over and over it - and trying every different variation on Jumper 3 - I'm stumped.
Regards,
Mike