PDP-11/20 in Iowa (x3)

Ethan Dicks ethan.dicks at gmail.com
Mon Mar 27 09:03:48 CDT 2017

On Mon, Mar 27, 2017 at 8:59 AM, Philipp Hachtmann via cctalk
<cctalk at classiccmp.org> wrote:
> Hm, interesting point of view... The 11/20 is the simplest 11 as far as I
> know. No microcode that can go bad.

Yep.  Simple and spread across multiple cards.

> The core memory systems are quite reliable. And if there's a problem,
> they're not that difficult to fix.

I liken them to OMNIBUS core in terms of repair complexity.  You _can_
fix them, but the analog nature of the devices put some people off.
There are things to learn for certain.

> A pdp11/34, /44 or any QBUS machine can ever be as cool as a 11/20, 11/40,
> 11/45/, /70 and so on.

Agreed, though at least the 11/34 can have a programmer's panel.  Not
as cool as individual lights...


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