DDCMP sync?

[Peter Coghlan]

>
> The other option would be synchronous links, which would enable connections
> to DMC11 or the like at speeds up to 1 Mb/s.  But synchronous comm devices
> that connect to modern computers aren't so easy to find, though I have seen
> a few.
> 

Not what would be called modern these days but I managed to run across two
MicroVAX 3100 machines with DST32/DHT32 synchronous serial interfaces in them
plus two V.24 and one each of V.35 and X.21 cables that will plug into them.
With some help from the people here, I managed to get the machines talking to
each other using a null modem between the two V.24 cables.  I also have two
nearly identical syncronous modems, one with a V.35 interface and another with
an X.21 interface but I have not managed to get these to talk to each other,
probably because they can't be configured to match any of the speeds the
DST32/DHT32 interfaces can do.

One of the MicroVAXes has since died (again) and I haven't got around to
looking at it yet to see what is wrong this time.

Regards,
Peter Coghlan.