30 Dec
2008
30 Dec
'08
9:38 p.m.
Ow... we had a Rev 0 board were the ins and outs were
swapped - for
the few that were made, it was "easier" to correct the fault by
chopping the pins short of the board and making "X"es with wire to
swap pairs of adjacent pins.
No ins ans outs swapped here - just connected together !.
Way back when, I maintained PDP7 and PDP11 for the UK Gov, a student
engineer was brought in to design a custom interface between the two
machines - smoke - the student dissappeared. Manager said find out why. The
design had input wired to output with a lot of unconnected logic in the
middle. -3V logic does not play nicely with +5V logic.
Mike
----- Original Message -----
From: "Ethan Dicks" <ethan.dicks at gmail.com>
To: "General Discussion: On-Topic and Off-Topic Posts"
<cctalk at classiccmp.org>
Sent: Tuesday, December 30, 2008 8:34 PM
Subject: Re: turned-pin headers
> On Tue, Dec 30, 2008 at 2:22 PM, Tony Duell <ard at p850ug1.demon.co.uk>
> wrote:
>>> I remember when they introduced the Correct-A-Chip--intended for
>>> applicationwhen your PCB layout guy was suffering the morning after
>>> the night before and reversed the pins on an IC.
>>
>> This reminds me of the possibly apocryphal story of the (expensive)
>> custom chip in a digital meter that turned out to be nothing more than a
>> 7106 (or maybe a 7107) left-right reveresed. Apparently the designer
>> laied the PCB out wrongly..
>
Ow... we had a Rev 0 board were the ins and outs were
swapped - for
the few that were made, it was "easier" to correct the fault by
chopping the pins short of the board and making "X"es with wire to
swap pairs of adjacent pins.
>
> Obviously that got fixed before Rev 1.
>
> -ethan
>
>