13 May
2015
13 May
'15
10:40 p.m.
Boy, if you don't know, then who is... But this brings up another good
point, where to get the older CTuL logic IC bus drivers (the 9956 in
particular) besides from old boards? I'll probably need a few to make my own
I/O boards, else I'll have make my own level converters out of SMD
components...
Marc
From: "Jay West" <jwest at
classiccmp.org>
Subject: HP board id?
It seems over the years I acquired more than a just a few of these (two
types of) boards for the HP1000. I'm pretty certain they all came from a
batch of about twenty HP 1000 series systems I got that were decommissioned
from military use. They do not seem to be HP in origin, and I don't have
any
clue what they are for. Mostly they seem to be stuffed with large numbers
of
op amps and some line drivers. Perhaps just flight line testing or ATP?
If no one thinks these are of any use. they will be scavenged for bus
driver chips. But I'd hate to do that if they might be historical or
"interesting".
A few pictures of each board are at www.ezwind.net/hp-unk
Educated guesses?
13 May
13 May
11:20 p.m.
On Wednesday, May 13, 2015 at 19:40, Marc Verdiell wrote:
...where to get the older CTuL logic IC bus drivers
(the 9956 in
particular) besides from old boards?
With the inclusion of a pulldown resistor to -2V, the TI SN75121 is a
recommended replacement, per page 5-6 of the "HP 1000 M/E/F-Series
Computers I/O Interfacing Guide" (02109-90006 September 1980). It's an
active part:
http://www.ti.com/product/sn75121
-- Dave
14 May
14 May
1:46 a.m.
Very interesting. What do they recommend on the receiver-end?
Is the "HP 1000 M/E/F-Series Computers I/O Interfacing Guide" (02109-90006
September 1980) available online somewhere?
On Wed, May 13, 2015 at 11:20 PM, J. David Bryan <jdbryan at acm.org> wrote:
On Wednesday, May 13, 2015 at 19:40, Marc Verdiell
wrote:
...where to get the older CTuL logic IC bus
drivers (the 9956 in
particular) besides from old boards?
With the inclusion of a pulldown resistor to -2V, the TI SN75121 is a
recommended replacement, per page 5-6 of the "HP 1000 M/E/F-Series
Computers I/O Interfacing Guide" (02109-90006 September 1980). It's an
active part:
http://www.ti.com/product/sn75121
-- Dave
11:31 a.m.
On Thursday, May 14, 2015 at 1:46, Paul Birkel wrote:
What do they recommend on the receiver-end?
LSTTL with a 4.7K pulldown to -2V on the input.
Is the "HP 1000 M/E/F-Series Computers I/O
Interfacing Guide"
(02109-90006 September 1980) available online somewhere?
I thought I had sent it to Al some years ago, but it's not listed. In any
case, I've posted it here:
http://home.earthlink.net/~jdbryan/dropbox/02109-90006_Sep-1980.7z
See chapter 5, pages 5-5 and 5-6.
-- Dave
9:16 p.m.
That is a *really* nice document, in so many ways. Thanks for sharing, and
for the answers to earlier questions :->.
On Thu, May 14, 2015 at 11:31 AM, J. David Bryan <jdbryan at acm.org> wrote:
On Thursday, May 14, 2015 at 1:46, Paul Birkel wrote:
What do they recommend on the receiver-end?
LSTTL with a 4.7K pulldown to -2V on the input.
Is the "HP 1000 M/E/F-Series Computers I/O
Interfacing Guide"
(02109-90006 September 1980) available online somewhere?
I thought I had sent it to Al some years ago, but it's not listed. In any
case, I've posted it here:
http://home.earthlink.net/~jdbryan/dropbox/02109-90006_Sep-1980.7z
See chapter 5, pages 5-5 and 5-6.
-- Dave
3437
days inactive
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days old
4 comments
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jdbryan＠acm.org -
marc.verdiell＠gmail.com -
pbirkel＠gmail.com