17 Oct
2004
17 Oct
'04
3:05 p.m.
Hope someone can help... I'd like to buy or trade 3 x BC08J DEC positive bus
cables... Berg connector one end, single-sided backplane plug card the other
end......... I'd like to hook my TC08 ( http://www.corestore.org/tc08.htm )
up to the positive bus / data break Omnibus cards in one of my pdp-8e boxes.
Takes five cables, I can only find two in my cable pile :-(
Thanks
Mike
http://www.corestore.org
18 Oct
18 Oct
6:20 p.m.
On Mon, Oct 18, 2004 at 12:05:15AM +0000, Mike Ross wrote:
Hope someone can help... I'd like to buy or trade
3 x BC08J DEC positive
bus cables... Berg connector one end, single-sided backplane plug card the
other end......... I'd like to hook my TC08...
Sorry... never even _seen_ those. You could probably make a set from a
prototyping card and some ribbon cable, though.
(http://www.corestore.org/tc08.htm ) up to the
positive bus / data break
Omnibus cards in one of my pdp-8e boxes.
Nice. I wish I had a TC-08. Got a couple of TU-56s, one on a TD8E (the
others on TC-11s).
From your pictures I can really see how
"easy" it would be to wrap one of
the empty slots on the right (backplane
view) for an RX8E. There'd also be
plenty of room for one of my other ideas - an RX8E-like controller made up
of M-series logic, no RX8E (since I have a limited number of them and a
box of spare modules) It might fill most of the open space, but I can't
see why it wouldn't work. (I've had this dream for years to put an RX01
on a PDP-8/L or PDP-8/i... I've run OS/8 on ONMIBUS hardware since 1984,
but I've _really_ wanted to run it on a TTL CPU).
Sorry I can't help with the cables, but thanks for the great pictures.
-ethan
--
Ethan Dicks, A-130-S Current South Pole Weather at 19-Oct-2004 03:00 Z
South Pole Station
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Ethan.Dicks(a)amanda.spole.gov http://penguincentral.com/penguincentral.html
20 Oct
20 Oct
4:26 a.m.
On Mon, Oct 18, 2004 at 12:05:15AM +0000, Mike Ross
wrote:
> Hope someone can help... I'd like to buy or trade 3 x BC08J DEC positive
> bus cables... Berg connector one end, single-sided backplane plug card
the
other
end......... I'd like to hook my TC08...
Sorry... never even _seen_ those. You could probably make a set from a
prototyping card and some ribbon cable, though. 
4:27 a.m.
>>>> "Ethan" == Ethan Dicks
<dickset(a)amanda.spole.gov> writes:
Ethan> On Mon, Oct 18, 2004 at 12:05:15AM +0000, Mike Ross wrote:
> Hope someone can help... I'd like to buy or
trade 3 x BC08J DEC
> positive bus cables... Berg connector one end, single-sided
> backplane plug card the other end......... I'd like to hook my
> TC08...
Ethan> Sorry... never even _seen_ those. You could probably make a
Ethan> set from a prototyping card and some ribbon cable, though.
That may not work... you want controlled impedance cable. I looked
for the spec, but didn't see it; it may be the same as Unibus cable,
which is documented in the Unibus handbook.
Conventional ribbon cable is not controlled impedance, though there
exists higher end cable that is.
paul
4:44 a.m.
From: "Paul Koning" <pkoning(a)equallogic.com>
Ethan> Sorry... never even _seen_ those. You
could probably make a
Ethan> set from a prototyping card and some ribbon cable, though.
That may not work... you want controlled impedance cable. I looked
for the spec, but didn't see it; it may be the same as Unibus cable,
which is documented in the Unibus handbook.
Conventional ribbon cable is not controlled impedance, though there
exists higher end cable that is.
It is pretty easy to find ribbon that is spec'd for impedance. It would say
it is more a matter of avoiding the low-end ribbon, these days.
The older Negibus/Posibus cables are spec'd for 93 ohm coax. I suspect
you'd do OK with 100 ohm ribbon.
I think a tougher issue with ribbon is how to keep the cables from sitting
on top of each other and having a mess of crosstalk. The older coax doesn't
have that problem :-). I am also building a few Negibus/Posibus cables out
of CAT5e, in an attempt to mitigate that problem.
Vince
7215
days inactive
7218
days old
4 comments
4 participants
participants (4)
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dickset＠amanda.spole.gov -
mross666＠hotmail.com -
pkoning＠equallogic.com -
vrs＠msn.com