PCs that support only one floppy drive in hardware

[Tony Duell]

> >> >> >F : 80 cylinder double sided
> >> >> 
> >> >> 300 rpm only
> >> >> 
> >> >> >G : 80 cylinder double sided, 360RPM, high density (1.2M for PCs)
> >> >> 
> >> >> Does both 300 and 360. (can replace the E and F with correct jumpers).
> >> >
> >> >I am not convinced of that. I think 'G' implies 360RM. The drive in 
> >> >question is a 'GFR', thus having the capabilites of both the 'G' and the 
> >> >'F', in other words both 360 and 300 rpm.
> >> 
> >> I am certain of the GFR, I have maybe 8 spares and 5 in use to confirm it 
> >
> >I am also certain about the GFR. I agree with you. The GFR is a dual 
> >speed drive, 360 rpm and 300rpm.
> >
> >What I am saying is that the letter 'G' as a suffix indicates a 360rpm 
> >drive. The letter 'F' indicates a 300 rpm drive (both being 80 cylinder 
> >double-sided). So both G and F mean a dual speed drive.
> 
> No Tony, the 55F in single speed only.  Now if you mean 55GF is dual speed

Agreed. F means 300 rpm 80 cylinder 2 heads.

> you might be right by coincidence.  However the second letter and third are
> for options to the basic drive such as door latch or media ready indicator.

The third letter, sure. But I thought single speed/density drives had 
just 2 letters (type and options), dual speed/dual density drives had 3. 
I've certainly seen HFR (or some other 3 letter combination starting with 
'HD') for 3.5" drives capable of 720K and 1.44M.

-tony