20 Mar
2002
20 Mar
'02
4:07 a.m.
Douglas Quebbeman wrote:
Why would I suspect a catch? From the conversations I follow
here regarding PDP-11s, it always seems to "depend"...
You should know this: I have *never* *ever* used a PDP-11.
I did use a DEC-10 extensively (including a little MACRO-10)
and a Harris 1200 (PDP-8 clone).
I know there is going to be a catch to this...
But which interface card will I need to add a TS05
(Cipher streamer 9-track drive) to a PDP-11/23?
Why a catch? - The 11/23 has a low-order digit of three, which
identifies it as a Q-bus machine. So you need a subsystem called TSV05
(as opposed to the UNIBUS TSU05), and the controller is M7196. Takes
6.5A @ 5V, counts as 3 AC / 1 DC loads on the logic lines. Like
"which version of the 11/23", and there's an
11/23+ too, isn't there?
Right, but shouldn't matter for this purpose. Sure, the TSV05 is a DMA
controller, so the number of address lines in the system is a concern,
but, the /23 has at least 18 address bits, and that should do. (See the
addresses from the manual: these show 6 octal digits = 18 bits!)
Ah, well, there is an "extended features switch" (pack at E58, position
9). This switch must be "on" for 22-bit addressing (and for streaming in
100ips mode, IIRC). Maybe this is the catch you're looking for?
I have not yet installed mine, however... - will be in a /23-PLUS.
Currently, I only have a TSU05 available (and am still looking for the
switch desingations...).