7 Apr
2001
7 Apr
'01
12:03 a.m.
On Fri, 6 Apr 2001, Clint Wolff (VAX collector) wrote:
IIRC, the 34 conductor control cable has (or may have) a twist
in it similiar to a floppy cable, but incompatible. I had a lot
of trouble with an ESDI drive that I could get to work. Oddly
enough, the floppy drives didn't work either :)
The twist better be like that for a hard disk or it will not
work. More and different leads and different side of the cable.
- don
clint
On Fri, 6 Apr 2001, Richard Erlacher wrote:
ESDI uses a 34-conductor control cable, and a
20-conductor data cable, both
similar to what's used on ST506/412.
The only widely used interface I know of that actually uses TWO 50-conductor
cables is the Pertec controller/formatter interface.
Dick
----- Original Message -----
From: "Jeff Hellige" <jhellige(a)earthlink.net>
To: <classiccmp(a)classiccmp.org>
Sent: Friday, April 06, 2001 6:06 PM
Subject: Re: pertec interface
This
sounds more like ESDI to me. If memory serves that was a two
cable system.
RLL and MFM were too, now that I think about it, although not 50 pin cables.
I'm betting ESDI.
The only true ESDI system, not counting the IBM DBA interface
used in some of the PS/2 series, that I have here is in my MicroVAX
II and it had daul Maxtor XT-8380E's installed. Full height 5-1/4"
drives of 380meg each. I pulled one of them out to replace it with
the TK50. Anyway, the cables for the drives are the same width as
MFM/RLL drives: 34 and 20 pins. This is verified by comparing it
directly to a Tandon TM-502. Wasn't ESDI an outgrowth of the ST-506
drives/interface?
Jeff
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