18 Jun
2020
18 Jun
'20
3:47 a.m.
On 18/06/2020 10:06, Peter Coghlan via cctalk wrote:
To get somewhere near back on topic, I am trying to set up a synchronous
serial link between two MicroVAX 3100 machines with DSH32 (or DST32 maybe)
interfaces. One of the options I have is a BC19D cable and a BC19V cable
which seem to be identical or nearly identical. Each plugs into a DSH32
at one end and has a V.24 DB25 connector at the other end. I don't seem
to have anything available in the way of a pair of suitably similar modems
or a modem eliminator to put between the two V.24 connectors. Can anyone
suggest some kind of a quick hardware hack that I could use to fill the
gap? Is a pair of DB25 sockets with crossed over wiring betweeen them
sufficient or do I need something that generates clock signals too?
I can't find my DHS32/DST32 docs right now but it's probably a simple
re-spin of the DSH32.
I think that the DST32 was the uVAX2000 option and the DSH32 was for the
uVAX 3100 series.
My notes say that my MicroVAX 2000 has a DST32 (54-17230) but the
preliminary version of EK-283AA-AD-001 is for the DSH32 and that talks
about the MicroVAX 2000!
I think that in the lab at DEC I used a modem eliminator (I used to
support all of the synch devices supported by VAX WANDD). I may even
have some of those modem eliminators in the garage.
Just to double check ... you definitely have synch boards and not (for
example) 8-way asynch lines? There were a whole bunch of designators
that were so very close: DST32, DHT32, DSH32, DHW41, DSW41!
Antonio
--
Antonio Carlini
antonio at acarlini.com