13 Feb
1999
13 Feb
'99
1:06 a.m.
What I find odd about the MITS FDD is that they used a 37-pin "D" connector
and cable as opposed to the 50-pin more commonly seen on the 8" types. I
found one among a set of enclosures I bought about 20 years ago. While
this is already promised out (once I find the top of the box), I do know
that there's an ALTAIR hard disk controller box, apparently with a drive
inside, judging from the weight, at Gateway Electronics in Denver, (303)
458-5444, if anyone's interested. It's the same size as the ALTAIR FDD
box.
Dick
----------
From: Allison J Parent <allisonp(a)world.std.com>
To: Discussion re-collecting of classic computers
<classiccmp(a)u.washington.edu>
Subject: RE: E-Over Pay strikes again! original Altair
disk sells for
Date: Friday, February 12, 1999 6:34 PM
<True enough I'm sure. MITS also produced a "mini"-floppy controller
that
<was also a two board TTL set. The first board
(computer interface) was
th
<same board as in the 8" set (except for
different RC values), the second
Well heres where I stand on it. Never seen one, I was there, and never
seen an advert for one, I have back issues. Was it possible, sure. The
8"
design with some tweeks would certainly do minifloppy.
Allison
13 Feb
13 Feb
5:49 a.m.
Well, I would not venture to suggest just where it originated, but the
37-pin D-sub connector has pretty much (there have been exceptions) been
the standard for connecting external floppy drives of all sizes. Almost
all PC (ISA) FDCs that support external drives use it, and the Xerox 820
(CP/M) series used it. Most S-100 crates did not, as they typically ran
the ribbon cable direct from the card to the drive.
- don
On Sat, 13 Feb 1999, Richard Erlacher wrote:
What I find odd about the MITS FDD is that they used a
37-pin "D" connector
and cable as opposed to the 50-pin more commonly seen on the 8" types. I
found one among a set of enclosures I bought about 20 years ago. While
this is already promised out (once I find the top of the box), I do know
that there's an ALTAIR hard disk controller box, apparently with a drive
inside, judging from the weight, at Gateway Electronics in Denver, (303)
458-5444, if anyone's interested. It's the same size as the ALTAIR FDD
box.
Dick
----------
From: Allison J Parent
<allisonp(a)world.std.com>
To: Discussion re-collecting of classic computers
<classiccmp(a)u.washington.edu>
Subject: RE: E-Over Pay strikes again! original
Altair disk sells for
Date: Friday, February 12, 1999 6:34 PM
<True enough I'm sure. MITS also produced a "mini"-floppy controller
that
<was also a two board TTL set. The first
board (computer interface) was
th
<same board as in the 8" set (except for
different RC values), the second
Well heres where I stand on it. Never seen one, I was there, and never
seen an advert for one, I have back issues. Was it possible, sure. The
8"
design with some tweeks would certainly do
minifloppy.
Allison
7:50 a.m.
New subject: ALTAIR stuff (was Re: E-Over Pay strikes again! original Altair
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8:52 a.m.
Don Maslin <donm(a)cts.com> wrote:
the 37-pin D-sub connector has pretty much (there have
been exceptions) been
the standard for connecting external floppy drives of all sizes. Almost
all PC (ISA) FDCs that support external drives use it, and the Xerox 820
(CP/M) series used it.
Do you mean that the various systems that used the 37-pin D-sub actually
used the same pinout? I was of the impression that there was no standard
for it (before the IBM PC created a defacto standard in 1981), so I
assumed that the IBM, DEC, and Xerox stuff probably used entirely unrelated
pinouts.
8:59 a.m.
New subject: ALTAIR stuff (was Re: E-Over Pay strikes again! original Altair
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1:22 p.m.
On 13 Feb 1999, Eric Smith wrote:
Don Maslin <donm(a)cts.com> wrote:
No, and I did not intend to imply that the pinouts were common. Only that
the connector hardware was pretty much standard for external floppy
drives. The Xerox 820 pinout is, in fact, rather different than the ISA
card pinout for external floppies.
- don
the 37-pin D-sub connector has pretty much (there
have been exceptions) been
the standard for connecting external floppy drives of all sizes. Almost
all PC (ISA) FDCs that support external drives use it, and the Xerox 820
(CP/M) series used it.
Do you mean that the various systems that used the 37-pin D-sub actually
used the same pinout? I was of the impression that there was no standard
for it (before the IBM PC created a defacto standard in 1981), so I
assumed that the IBM, DEC, and Xerox stuff probably used entirely unrelated
pinouts.
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