24 Jul
2013
24 Jul
'13
2:55 p.m.
-----Oorspronkelijk bericht-----
Van: cctalk-bounces at classiccmp.org [mailto:cctalk-bounces at classiccmp.org]
Namens Brent Hilpert
Verzonden: woensdag 24 juli 2013 23:06
Aan: General Discussion: On-Topic and Off-Topic Posts
Onderwerp: Re: HP 9830A always turns on with blank display
On 2013 Jul 24, at 11:22 AM, Tony Duell wrote:
HP put the connectors at different positions so each board would be keyed
differently, but you don't need an extender for each board.
You only need a set of 6 'standard' extenders, of the same height; one of
each:
I will
check this out, hopefully this weekend.=A0 Out of curiosity,
is ther= e an extender or some other way of probing these boards
while powered up?=
Extender boards are very rare. JHP never intneded thse machiens ot be
reparied to compneent-level in the field so there was no official set
of extender baords. And they carefully put the conenctors for
different boards in differnet positions so you would really need an
extender for each board. 10*2
15*2
18*2
22*2
24*2
25*2
Each board has one or two connectors from the above set and for those with
two the two are always different. So each board can be extended by
selecting
the appropriate single or pair from the set of six.
You can only extend
one board
at a time this way, but it's a lot easier than the
alternative of a set of
17-or-so
very specialised extenders.
It's just unfortunate HP used the 25-pin connector, as it is not too
common.
Yeah, great engineering isn't it ?
-Rik