9 Nov
2010
9 Nov
'10
6:28 p.m.
On 11/9/10, Tony Duell <ard at p850ug1.demon.co.uk> wrote:
The cables are differnet betwene the RLs and the
RK06/07 (the latter has
all pins bet one (termintor power) connected
That rings a bell (term power).
the former has rather fewer
wired), but AFAIK the terminator is the same (it terminates all signal
pins. I think at least one RL controller printset shows the exploded view
of the terminators with 'First used on Option/Model : RK06' specified.
OK. That's a good detail to remember when setting up drives of either kind.
One handy bit of trivia if you happen to have spare Unit plugs from
the high numbers of an RK06/RK07 set is that they work in an RL01/RL02
if you mentally mask off 2^2 (i.e., an RK06/RK06 plug labelled "4" is
"0" on an RL01/RL02). It's the same sort of switch/bulb housing, but
one less bit going back to the electronics. We didn't do it often,
but sometimes we were short some of the numbers and we did have a
couple of RK07s and a drawer of random unit plugs.
-ethan
10 Nov
10 Nov
2:47 p.m.
New subject: RL01/RL02 cables and terminators and unit plugs (was Re: PDP-11/34A
On 11/9/10, Tony Duell <ard at p850ug1.demon.co.uk> wrote:
Yes. the terminator needs a +5V supply (electrically, the termiantor is
what you'd espect, a load of potential dividers between +5V and ground
with the signals going to the taps). On th RL drives, the 2 connectors on
the back palen are electrically identical [1] and are connected by a 40
wire ribbon cable wit 3 BERG connectors (one to fit ontyo each of the
cable connectors, the last one goes to the Drive Logic Board. So the +5V
apears on both cable connectors. For obvious reasons connecting the 5V
supplies of 2 drives in parallel is a bad idea, so that pin is not
conneced in the cable. All others are connected in an RK06/07 cables
(whcih can be used on RLs IIRC), but the true RL cable only has the
necessary singals conneted.
[1] I don;t think that;'s true of the RK06/07. The 'In' and 'Out'
connectors are marked o nthe backplane and I think you have to get them
the right way round. Maybe some signals are buffered in the drive or
something. I would haev to chack the prints.
The cables are differnet betwene the RLs and the
RK06/07 (the latter has
all pins bet one (termintor power) connected
That rings a bell (term power). One handy bit of trivia if you happen to have spare
Unit plugs from
the high numbers of an RK06/RK07 set is that they work in an RL01/RL02
if you mentally mask off 2^2 (i.e., an RK06/RK06 plug labelled "4" is
"0" on an RL01/RL02). It's the same sort of switch/bulb housing, but
one less bit going back to the electronics. We didn't do it often,
The RL switch housing has all the contacts fitted, but one of them is not
connected up.
The 0..3 caps are indencial between RLs and RK06/07s, the 4..7 work as you
describe. The other caps fit too, I think one of my RK07s has thr wrong
cap on the laod switch, it came off a dead RL...
-tony
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