PDP-11/20 in Iowa (x3)

Philipp Hachtmann hachti at hachti.de
Mon Mar 27 07:59:54 CDT 2017

On 03/27/2017 12:03 PM, dave.g4ugm at gmail.com wrote:

>> On 03/27/2017 08:05 AM, Paul Birkel via cctalk wrote:
>>> http://www.vcfed.org/forum/showthread.php?56897-Came-across-three-
>> PDP-
>>> 11-20-
>>> units-today
>> Haha, those low-brain comments!
>> User g4ugm: "have core memory... lower value"
> I have the impression that 11's with core in are harder to fix, so the pool
> of buyers are smaller...

Hm, interesting point of view... The 11/20 is the simplest 11 as far as 
I know. No microcode that can go bad.
The core memory systems are quite reliable. And if there's a problem, 
they're not that difficult to fix.

For me it's important that the computer has core memory: It's a big part 
of the fun!

The sc memory systems are too close to modern hardware. Without 
blinkenlight panels or at least LEDs instead of incandescent bulbs.

Not to forget: More vintage -> More cool ( -> higher value)

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.
I somewhere have an 11/45 with full core memory (something over 200k). 
But the CPU has issues... :-(

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