23 Mar
2013
23 Mar
'13
3:47 a.m.
Resend without attachments (too big; sorry 'bout that :-<). Anyone
interested in the missing attachments please contact me off-list.
On Sat, Mar 23, 2013 at 3:17 AM, Paul Birkel <pbirkel at gmail.com> wrote:
No PDP-11-eating, please! The BC05C cable, and also
the 7008360 cable,
seems to be the key; these are shared across a number of DEC
modules/variants.
Finding documentation is quite a Where's-Waldo exercise, but a lot of it
is "out there" it seems :->. In my case the attached two items were
extracted from larger, varied, documents. Perhaps they'll be useful for
the next challenged person :->.
On Mon, Mar 18, 2013 at 5:08 PM, Tony Duell <ard at p850ug1.demon.co.uk>wrote:
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Can some kind soul point me to the technical documentation for the Q-Bus
DLV11 M7940 Serial Line Unit? It has a 2x20 pin-out connector of
unknown.
I gather that it's a pretty common card, so
I'd expect the
documentation to
still be "out there" ... like the truth
:->.
Not the DLV11-J, which is the 4-line card.
The only good news is that the MC1488 and MC1489 are nearby, which will
help a little. But documentation is *much* better! Probably any of its
variants will do just fine (e.g., M7940-YA "M7940 W EXTRA WIRES TO BRING
OUT CLOCK & 110/300 SPEED CHG").
It should be much the same as the pinout for the DL11 (Unibus) seiral
interface or even the DL8 (Omnibus). It's a very ocommon DEC serial port
pinout. If there's no documetnaiuton on _any_ of thsoe out there, I will
eat a PDP11 or something.
One trap for the unwary. These cards, or at least some of them, have
both RS232 and current loop interfaces on them. The outputs of the 2
possible receive buffers (1489 for the RS232, a nopo-isolator bnsed
circuit for current loop) appear on pins of this conenctor, as does the
inptu to the UART chip. You have pumper the appropriate pair of pins on
the connecotr of your cable. if you don't, you'll never receive anything.
-tony