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sbrown
July 25th, 2005, 12:55 PM
I picked up a 55sx recently and found out that the floppy drive is only useful as a bookend now. Maybe I'm completely wrong on my assumption, but after looking up some pinouts it seems I should be able to patch a cable and use a non ps/2 floppy so that I can use the reference disk when needed.

I tried this using a known good drive, using a straight cable with only a single connector for a drive. I cut only 3 & 6, as those power the drive and/or are unused/ground by a standard floppy. The rest of the odd pin grounds I left. This was based on my impression that this particular model didn't use a media sense drive.

The system boots normally and doesn't give a 601 error, but cannot use the drive. All I get is a "Drive not Ready" dos error. The motor spins and the head seems to try to step, but that's it. Has anyone else done this and can point out where I may have gone wrong?

MystikShadows
July 25th, 2005, 05:48 PM
Didn't the old PS/2 have two inverted wires in the floppy connectors? In which case you'd need to find an IBM specific MFM floppy cable.

sbrown
July 25th, 2005, 06:41 PM
Yes, they did. The "normal" twist other systems are used to is missingand pins 10 & 14 are reserved or altered, thus there is only one drive possible at ds1. I'd keep on trying with another single drive I could jumper, but I don't have a working drive like that anymore and the dual 3.5/5.25 (working) junker I just tested it on did the same thing when I jumpered it. I'm beginning how different those old ps/2 floppy drives are from the "usual", so maybe time to start looking for another drive.

MystikShadows
July 25th, 2005, 06:54 PM
Yeah I thought so :-) you might want to consider a new drive like you're saying...Probably will be alot less hassle :-)