Looking for IBM PC/XT/AT technical references

[Scott Stevens]

On Tue, 13 Sep 2005 16:36:56 -0400
Ethan Dicks <ethan.dicks at gmail.com> wrote:

> On 9/13/05, Tony Duell <ard at p850ug1.demon.co.uk> wrote:
> > > >However I did find three IBM marked FH Tandon TM-100  5 1/4" disk
> > > >drives last week :-)
> > > >
> > > Are those special? I think my TRS-80 Model III has two of them. 
> > 
> > AFAIK there is nothing electrically or mechanically special about
> > them, apart from the faceplate.
> 
> For those that are considering moving floppy drives from one machine
> to another, just remember that there are single and double-sided
> versions of the TM-100 (various models from the TM-100-1 through the
> TM-100-4).  As long as you match up the model numbers (the TM-100-2A
> is probably what you want for an ancient PC), the logo on the face
> plate has no influence on what the controller does to the drive (i.e.
> - there are _no_ electronic differences between an IBM-badged TM-100
> and the same drive with a plain faceplate).
> 
> I only say that because I've seen single-sided TM-100s (TM-100-1A) in
> CP/M machines.  They should work with an  IBM 5150 PC, but, naturally,
> only as single-sided drives, at a nominal 180K under DOS 2.1 and newer
> (9 sectors per track vs 8 sector "160K" disks in the earliest
> examples).
> 

Yes but then you can notch your diskettes and flip them.