Re: PDP 11/40 system manual

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From: Bob Eager
Date: Thu, 09 Aug 2018 21:54

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On Thu, 09 Aug 2018 17:36:24 -0400, Peter Flass wrote:

> Charles Richmond <nume...@aquaporin4.com> wrote:
>> On 8/9/2018 1:45 PM, Rich Alderson wrote:
>>> Elliott Roper <nos...@yrl.co.uk> writes:
>>> 
>>>> On 8 Aug 2018, hanc...@bbs.cpcn.com wrote (in
>>>> article<21aaeee8-c41a-4442...@googlegroups.com>):
>>> 
>>>>> Bitsavers uploaded the system manual for the PDP 11/40.
>>> 
>>>>> http://www.bitsavers.org/pdf/dec/pdp11/1140/DEC-11-H40SA-A-
D_PDP-11_40_System_
>>>>> manual.pdf
>>> 
>>>>> 358 pages, undated.
>>> 
>>>> Thanks. Unbounded nostalgia. Was there ever a more elegant computer
>>>> than a PDP-11?
>>> 
>>> Yes, many.
>>> 
>>> 
>> *Not* that I disagree...  but which other computers do you find
>> elegant???
>> 
>> 
> System/360.

All that base register stuff...

For me, the ICL 2900 (largely designed by Manchester University).

One variable size accumulator. 
One B register.
One descriptor register.
One stack frame register and one stack front register.
Two off-stack bases for other data.
Segmentation and paging.

Performance good at front of stack due to caching. Better than trying to 
optimise register use.

-- 
Using UNIX since v6 (1975)...

Use the BIG mirror service in the UK:
 http://www.mirrorservice.org

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From: Bob Eager <news...@eager.cx>
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Subject: Re: PDP 11/40 system manual
Date: 9 Aug 2018 21:54:48 GMT
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