RSTS/E and PDP 11/23

From: Paul Koning <>
Date: Mon May 17 10:49:00 2004

>>>>> "John" == John A Dundas, <John> writes:

>> I was thinking about attempting to SYSGEN RSTS/E v7.0 on this
>> machine, but in looking over some info on RSTS/E, it does not list
>> the 11/23 as one of the systems that RSTS/E will run on.

 John> The SPD for V7 says it will run on any PDP-11 processor with
 John> memory management and EIS. It also needs at least 128KB of
 John> memory and a clock. IIRC, the /23+ has 22-bit memory
 John> management. Does the /23 have 18-bit memory management? If
 John> so, and you meet the other requirements, it should work.

That depends on whether RSTS V7 had Qbus device support. I don't
remember anymore.

Later versions certainly did; RSTS V9 or V10 for example should work
fine. But I don't remember when the first Qbus system support

Just booting the sysgen disk or tape will tell you. If you can get to
the INIT prompt, tell it "hardware list". If you see all your
devices, you should be in business.

Received on Mon May 17 2004 - 10:49:00 BST

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