Date   : Wed, 08 Jul 2009 20:49:09 +0100
From   : acorn@... (Andy Ford)
Subject: Master Compact Drive Cable

I don't suppose anyone has a picture / diagram to hand of how these are 
wired do they ?

I looked at all the pictures I could find but none are clear around the 
actual wiring area. From what I can see (apart from the cable having 
less wires) , two pins are joined too.

I have acquired a Compact with twin drives (both drives do work, tested 
well with a 1770 B) , but I am struggling to see how to actually wire 
them in a Compact due to the cable. I have the D plug wired with 
(short-ish) length of cable but nothing more. I have tried a few 
permutations without much luck :(

I do know about the DS select switch on the sides of the drives ;) , as 
a side note: when I used them on the 'B' , the drive light did not work 
at all, although when I (accidentally!) plugged the cable in upside 
down, it did permanently illuminate (as expected) so I'd guess they are 
internally wired slightly differently anyway, maybe specially produced 
for Acorn ?

Any advice,hints,tips or a diagram would be most welcome :D