PCs that support only one floppy drive in hardware
ajp166 at bellatlantic.net
Thu Oct 13 14:09:56 CDT 2005
>Subject: Re: PCs that support only one floppy drive in hardware
> From: ard at p850ug1.demon.co.uk (Tony Duell)
> Date: Thu, 13 Oct 2005 10:39:21 +0100 (BST)
> To: cctalk at classiccmp.org
>> >The _drive_ is HD, I am not sure what the controller can do, though. The
>> >suffix letters of Teac drive numbers seem to indicate the specs as
>> >follows :
>> >A : 40 cylinder single-sided
>> >B : 40 cyclinder double sided
>> >C : 77 cylinder single sided (??? I have never seen this)
>> >D : 77 cylinder double sided (??? or this)
>> >E : 80 cylinder single sided
>> >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
with. Dec use that drive in the VAXMATE at 1.2mb and as RX33 in uPDP-11
at 400/800KB (low speed) units I've used for both are exact same units.
one oddity of the FD55GFR series is I have at least 5 different PC board
patterns that function the same, they are of different date codes.
I have also used them in my S100 system for the infrequent DSQD 780kb
CP/M format that is compatable with my Kaypro 4/84 with Advent turborom.
I also have a supply of FD55B, E and F series drives as spares and in
use My three Visual 1050s have the FD55E in them. My knowledge is first
Read the data for that drive and you will see that FD55GFR is a DUAL
>> >H : 80 cylinder double sided, 300RPM, high density (1.44M for PCs)
>> Never seen an FD55H.
>No, but the same suffix letters are used on 3.5" drives too.
I would have guessed it was 3.5" too.
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