9 Jul
2014
9 Jul
'14
9:57 a.m.
On 2014-07-09 9:32 AM, dave at mitton.com wrote:
On 2014-07-09 02:22, cctech-request at classiccmp.org wrote:
The XT or IBM 5160 was announced and shipped with a fixed disk right
Date: Tue, 8 Jul 2014 14:22:40 -0700 (PDT)
From: Fred Cisin <cisin at xenosoft.com>
To: "General Discussion: On-Topic and Off-Topic Posts"
<cctalk at classiccmp.org>
Subject: Re: best dos machine
Message-ID: <20140708142144.O37762 at shell.lmi.net>
Content-Type: TEXT/PLAIN; charset=US-ASCII
(IBM never called it "motherboard" due to use of the word "mother..."
<snip> Fixed drive (IBM didn't called it a "hard" drive)
On
Tue, 8 Jul 2014, A. P. Garcia wrote:
and don't forget to use our favorite
numbering system, hexidecimal, because ibm was too prudent to call it sexadecimal...
"FIXED" disk?? "FIXED" In a veterinary context??!?
No - "Fixed" as opposed to "Removable"
Remember big-boy machines had disk packs (Winchesters, etc) that you
swapped in and out.
In DEC speak: RK05s, RP0x and so forth.
And btw: the IBM XT originally came with 5.25" floppies the fixed hard
drive came later.
Dave.
from the beginning, however its immediate predecessor
the 5150 was a
floppy based machine.
The the "Winchester" was first applied the IBM 3340 disk unit, its
design point was to have two 30 MB spindles in each unit or 30-30 so
calling it "Winchester" was a natural since 30-30 is a calibre of the
famous Winchester rifle. This disk unit had removable packs that where
sealed and contained the heads, access arm and the platters. when
mounted in the drive the spindle coupled with the motor in the disk unit
and a door opened on the back to allow the access arm to be coupled with
the voice coil actuator. The disk packs also had 2 heads per surface to
allow for faster data access since the full stroke of the arm was only
half the width of the platter and was one of the first disks drives
where the heads where allowed to land on the surface.
Paul.