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Experimenting with Floppy Controllers and 8 " Diskette Drives

Jimmy

Veteran Member
Joined
Feb 19, 2012
Messages
587
Location
Fort Walton Beach, Fl
I have a Mitsubishi Model M2896-63-02U 1/2 height 8" diskette drive. I have tried several controllers the XT-FDC, Sergeys FDC, both boards are equipped with PC8477 chips. I also tried a CompatiCard IV card. The drive is powered with Dbits power supply and using their 50pin to 34 pin adapter. I was moderately successful with all 3 configurations. The drive is configured as a 1.2 meg drive in all configurations. I was able to access the drive. Format a diskette and read it back. I could SYS: with all 3 controllers and read read the disks. I could not boot from any configuration. I also could not read disks written from different controllers. I had a straight through 34 pin cable. I did try the 50 pin connector but the XT-FDC would not recognize the Drive. I was able to Image some disks using Dave Dunfields Image Disk.

Any suggestions on why the 50pin connector did not work on the XT-FDC?

I also have a Shugart Model 801 disk drive but need to construct a power adapter.
 

Chuck(G)

25k Member
Joined
Jan 11, 2007
Messages
40,242
Location
Pacific Northwest, USA
Two things jump out at me. The first is that you didn't mention how the drive was configured. Per Table 6-1.

Secondly, you didn't mention what kind of 8" disks you were using--the index hole is placed differently for single-vs-double-sided ones.

Ideally, with a double-sided floppy, you should be able to format up a diskette as a more-or-less standard 5.25" HD (1.2MB) floppy, although it lacks the last 3 tracks of a 5.25" drive.
 

Jimmy

Veteran Member
Joined
Feb 19, 2012
Messages
587
Location
Fort Walton Beach, Fl
Chuck:

First I want to thank you for helping me get the drive configured with the Compaticcard IV a few years ago. It did exactly what I needed, to use Image Disk for numerous 8” diskettes with IBM System/36 SSP, compilers and utilities.

It will be this weekend before I can get the drive jumper settings, I smiled when you mentioned jumpers since the drive must have 15 or more. I can format a disk using the /s and it formats successfully. I can copy and read files from the disk. I can Run executables with either the Compaticcard or the XT-FDC.

I have not been able to boot from the floppy with my current configuration. I am using fresh out of the box, must be 35 or 40 years old Memorex 2S/2D 1024 bytes. The disk formats without bad sectors.

I tried the 50 pin connector on the XT-FDC, is it operational. If so do it need jumpers need to be set differently.
 
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