5 Mar
2002
5 Mar
'02
2:25 a.m.
At 07:46 AM 3/5/02 -0700, you wrote:
see below, plz.
Dick
----- Original Message -----
From: "Joe" <rigdonj(a)cfl.rr.com>
To: <classiccmp(a)classiccmp.org>
Sent: Tuesday, March 05, 2002 6:50 AM
Subject: Re: Need Shugart 851 manual
only
At 04:31 PM 3/4/02 -0700, Richard wrote:
Agreed ... I'm having a little trouble with that one myself ... there are I'd advise you to pursue this from the
controller end, initially.
Good idea. Unfortunately the card connector is numbered 1-100 with odd
numbers on one side and even one the other (exactly same as S-100). But
it's connector is numbered A1 through A50 on one side and B1 through B50 on
the other. It makes things confusing! It's not something that you should
do when you're tired!
25 pairs on the cable.
There are (or can be) 100 wires per cable.
What do they do with the numbers greater than 25 on
one side and 50 on the other?
There are 50 contacts per side. All the odd numbered wires are on the A
side and all the even numbered ones are on the B side. But here's one place
that it gets very weird, A1 is pin 99 and A50 is pin 1 !!! The same thing
happens on the B side, B1 is pin 100 and B50 is pin 2!
I came up with a couple of formulas to help figure out the wire numbers.
Wire # for contact Ax is (51-x)*2 and the wire # for contact Bx is
((51-x)*2)-1. I *think* that's right! it was late when I was working on it.
Perhaps you'll want to give up on using th '85x's on the Intel box and use
80x's instead. There will be a cleaner path for you to follow, though,
clearly, it won't be totally obvious.
I would use 800s if I had any but it seems like all I can find are 85xs
:-/ I've got two extra 800s but they've been out in the weather and they
look nasty!
Joe
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