PDP-11/53+ Jumpers

From: ajp166 <ajp166_at_bellatlantic.net>
Date: Thu Jun 7 21:58:55 2001

From: Pete Turnbull <pete_at_dunnington.u-net.com>
>like that. But a box labeled 11/53 and having an 11/23 procssor in it
> an 11/23, not an 11/53. It won't run RSX-11M or Ultrix configured for
>11/53, or various things.

An 11/23 would run RSX-11 just not the I&D kernal, same for Ultrix
depending on version.

>I'm surprised you say it's common. I can see that in a few cases the
>processor might be removed to use elsewhere, but how many systems end up
>with a 5-years-older processor in them? In my experience, it's much

It was happening when the processors were NEW. Seems it made a very
compact fairly fast system if the DEC box was not used. However early on
getting the bare CPU was difficult so people bout 11/53s, snatched the
and resold them with commonly available 11/23s (as Micropdp-11s)

>common to see systems with later processors in them (though I'm thinking
>11/03 -> 11/23, 11/23 -> 11/73, 11/73 -> 11/83, microVAX -> microVAX-II

Yep, like my 11T03 that has a BA11N and 11/73 cpu or maybe my
that was downgraded to a Micropdp-11. ;)

Received on Thu Jun 07 2001 - 21:58:55 BST

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