--- Tony Duell <ard(a)p850ug1.demon.co.uk> wrote:
What the heck is an ASR33 if not a serial
terminal????
Umm... well... yes. But that's not what I was thinking of... I was
thinking more along the lines of LA-36s and DECwriter IVs and
Actually, the LA36 has current-loop as standard, and the RS232 interface
was an option which connected to a TTL-level serial connector on the
mainboard....
everything in between - RS-232 (EIA) dot-matrix serial
printing
terminals/serial printers (no keyboard).
[...]
3rd parties
made 4 and 8 port Unibus DL11s, though.
Haven't seen those. They sound interesting. I have seen (and have
Systime made a 4 port one (I have it), it's a hex-height card, with a
single connector for the 4 serial ports.
I forget who made the 8 port ones I have. There's a hex height board
containing the UARTs and the rest of the logic with a TTL-level interface
to the distribution panel which contains the RS232 drivers. I assume a
current-loop panel existed too.
-tony