[HECnet] VAX/VMS 1.50

[Paul_Koning at Dell.com]

On Apr 4, 2013, at 5:18 PM, <hvlems at zonnet.nl>
wrote:

Apparently not. The reason I came up with the device is that I used a PDP 11/40 with a DU11 to connect to a Burroughs B7700 using an RJE like protocol. It was called SYSTEM/SATCOM IIRC. The PDP ran RT-11 V4. 
Other than that, networks were built using 1200 baud modems on serial lines. No DMF32 nor DZ11 in '79. How did one connect all those VT52's and LA36's, via a DL11?

I thought DZ11s were around back then.   But if not, the DH11 sure was, 16 lines, DMA output.   But that's for terminals up to 9600 baud.   For networking, you'd use a DMC-11 unless your OS supported the cheaper devices and money was that tight -- that one goes back to about 1976 and delivers up to 1 Mb/s depending on model (up to 56 kB/s long haul, given suitable modems).

Lots of terminals with single line interfaces would be really ugly.   But I do remember our college main timesharing system, in 1973, a PDP-11/20 with 28 kW of memory, RSTS V4A, and 16 terminals on 16 separate KL11 or DL11 interfaces.   Oh yes, and a mean time between crashes of about 1 day.

	paul