12 Jun
1999
12 Jun
'99
11:48 a.m.
Actually they could all write MFM (double density). The problem was that
some couldn't read what they had written because there was inadequate write
precompensation and the waveform peaks were at the wrong time during read
and their amplifiers weren't sensitive enough to catch them. In any case
what the COULD and what the DID were often not the same.
Dick
-----Original Message-----
From: Tony Duell <ard(a)p850ug1.demon.co.uk>
To: Discussion re-collecting of classic computers
<classiccmp(a)u.washington.edu>
Date: Saturday, June 12, 1999 5:42 PM
Subject: Re: tandon 848-2 8" floppy drive
Does anyone here have the specifications for a Tandon 848-2 8"
floppy drive? Mainly i'm interested in if it is DSDD, and if
Easiest way to see how many sides it can do is to look at the number of
heads. If the thing on the 'top' side (away from the spindle) is a head
(i.e. it has wires going to it), it's double sided.
Also look at the number of index sensors. Most (all?) double-sided drives
have 2 of them as the index hole is in different places on SS and DS 8"
disks.
AFAIK, almost all 8" drives, other than possibly the _very_ early ones
can do double density.
-tony