I have a PDP-11/34 programmer's console, what should I do with it? - test-drb@ccmp.vtda.org

15 Mar 2002

...
  From: ard(a)p850ug1.demon.co.uk (Tony Duell)
 Subject: Re: I have a PDP-11/34 programmer's console, what should I do with it?
 To: classiccmp(a)classiccmp.org
 Date: Sat, 16 Mar 2002 01:08:38 +0000 (GMT)
 In-Reply-To: <01aa01c1cc34$96981700$8a0101ac@ibm23xhr06> from "John
Allain" at Mar 15, 2 10:17:56 am
 Sender: owner-classiccmp(a)classiccmp.org
 Reply-To: classiccmp(a)classiccmp.org

 tony said:
  If you then solder the mating part of the
connector to stripboard 
 with a track cut between the 2 rows of pins then each pin will be
 on it's own strip.  
 This isn't bad, except for that the signals are now one set of
 1,3,5,7...  and one set of 2,4,6,8...   If I want to keep the
 contiguous signals together then I have to jumper just about  
 I may be missing something here, but is there any reason why you have to 
 keep the signals in numerical order? OK, you have a PDP11/34 console with 
 the 20 way (or so) ribbon coming off it. What are you trying to link it 
 to? If you're building your own interface circuit you're going to have to 
 route the signals around to different chips, surely. 
Seems to me that nearly all ribbon cables use even-numbered pins for
signal and odd-numbered pins for ground.  So signal and ground lines
alternate in the cable.  

    carl
-- 
        carl lowenstein   marine physical lab   u.c. san diego
                                          clowenstein(a)ucsd.edu