resurrecting a PDP-11/10

From: Tony Duell <ard_at_p850ug1.demon.co.uk>
Date: Thu Feb 27 18:29:04 2003

> --- Tony Duell <ard_at_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
Received on Thu Feb 27 2003 - 18:29:04 GMT

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