The cabinets in the background are probably part of the VAX 8600 setup I think.
I did not have a closer look back then, because I was busy to get my VAX-11/750 (rather one 80% complete VAX-11/750 and two rather desolate and almost empty 750s) out of there. These are two of them on my horse trailer:
Nice DEC Networking collection that you have - I'm a little jealous.
I have a H4000 and some H4005, but the rest of my DEC Networking equipment is younger.
I wrote a
page about DEC Ethernet Transceivers on Gunkies.
I have two DECnet networking setups in mind:
- An early Ethernet setup using "Yellow Cable"
- A pre-Ethernet (and WAN) setup using DDCMP over synchronous and asynchronous serial lines
Both connected to each other of course.
The DEMSA can connect multiple DDCMP synchronous lines without consuming too much electric power.
The DSRVC (DECrouter 200) can do the same, but for asynchronous lines.
I found out that it is easy to convert a DECserver 200 into a DECrouter 200, and I will do so as soon as I've got one.
Did you know that there is a section about the DEMSA in the EK-CMIV6-RM-005 Communications Options Minireference Manual Volume 6 Ethernet Devices Part 2?
Just in case not I've appended it here.
I think there are even fewer VAX 8600 still around than VAX-11/780. Now I know how difficult in can become restoring a VAX-11/750, I'm happy that I did not acquire a VAX-11/780 (I never had a chance to up to now I must admit) nor even the VAX 8600.
There are some frightening rumors about the VAX 8600, e.g. (I don't know whether they're true):
"We had to have a DEC technician on site 24/7 to keep our VAX 8600s going!"
"You cannot simply but any VAX 8600 boards together to get a working VAX 8600, the board revisions must match exactly"
But your set of boards was probably pulled from one VAX 8650, so they should match.
Have you got other VAXen, especially "classic" ones? I consider all VAXen "classic" that can be run with VMS V4.x or earlier.
My "classic" VAX collection consists of:
- VAX-11/750 (not working yet)
- VAX-11/725 (not working yet)
- MicroVAX I (working)
- 2 MicroVAX II (working)
- VAXstation 2000 (working)
Ulli