13 Feb
2003
13 Feb
'03
8:51 a.m.
On Wed, 12 Feb 2003, Tony Duell wrote:
Certainly a Qume something-or-other.
[...]
According to the O&A TechRef, there are 2
distinct 40 cylinder drives :
The 'Slimline' drive used in the PortablePC and PCjr. This des not have
the asterisk
Originally a Qume "Qumetrak 142"? matter, I failed to include step rate. The Qume drive
was arguably the
first "half height" 5.25" drive, and it was SO slow that changes needed
to
be made in the OS to keep from timing out waiting for it to seek.
Some say that it was the worst drive ever sold; I don't agree - I had some
BASF 2/3 height drives that were worse.
Having seen those darn things in RML 380Z machines, I fully agree with
you. Horrible drives..
The double density (360K) drive for the PC/AT.
This does have the asterisk.
They are difference electrically (made by difference companies?). I think
the use of pin 34 on the connector differs too.
At about the time that the 1.2M was released, there was a change in the
use of pin 34. One use was "READY"? the other was "DISK CHANGED"?