First post, by DamienC
I've done a fair amount of googling and I'm kind of stuck. I've been doing my annual messing around with old PCs and I'm having trouble with the 5.25" floppy in my 486/POD 83 build.
In a nutshell, I can read/write 1.2mb HD floppies perfectly fine, but this drive/machine won't read 360k disks at all. The floppy drive is a Teac FD-55GFR, my favorite 5.25" model and is set up to be drive B.
- Amptron DX-9500 aka PCChips M919 v1.5 (fake cache removed, 256k real cache added)
- Pentium Overdrive P24T 83MHz CPU
- 16mb FPM RAM
- S3 Virge DX PCI 4mb
- Sound Blaster 16 CT1740
- IDE to SD adapter - 4gb SD storage
- Allied Telesyn AT2000 10mbps Ethernet
- AOpen 48x IDE CD-ROM
- MS-DOS 7.1 (built from Win98SE disc)
I have this same floppy drive in two other machines: a 1991 Zeos 386SX with onboard floppy controller, and a Biostar motherboard 386DX computer with a generic ISA disk controller card. Both computers have a two-floppy drive setup with the 5.25" disk as drive B and they all read and write 360k disks just fine.
Unfortunately I only have enough room in my house for one vintage PC set up at a time, and I really want this jack-of-all-trades system to be the one I have set up for both gaming and also making disk images of all my old floppy based games.
Things I've tried that don't work (mostly based on Google results of similar issues):
- Different floppy cables
- Floppy drive swap in BIOS
- Disabling all caches (L1 & L2)
- Different autoexec.bat/config.sys configurations (clean boot, no EMS, etc.)
- Cleaning drive heads
Things I still need to attempt:
- Disconnect 3.5" drive A and just connect the 5.25" drive and see if issue persists
- Swap known working drive from other system and test in this one and see if issue persists
I have a feeling this particular drive is just going bad. I hope to dig out one of my other floppy drives and throw it in this machine and see if it works, but I might not be able to do that for a couple days.
Is there anything else I could check in the meantime to figure out why this is happening? I know about the issues with 360k disks in 1.2mb drives, but I figured that mostly related to writing/formatting and I really just want to make disk images of 360k disks I have.