PDP 11/24

Ethan Dicks ethan.dicks at usap.gov
Thu Jan 24 01:32:08 CST 2008

On Wed, Jan 23, 2008 at 10:59:56PM -0800, silvercreekvalley wrote:
> I've read quite a few DEC faq's recently, but couldnt
> find performance spec's on the PDP 11/24. Is this the
> same as the original 11/23?

The same execution speed? Yes, I believe so.

> How would it compare with a 11/34A?

I'm not sure.  I've never compared relative PDP-11 performance,
but there should be some literature from the period that does.

> From what I can see the 34A was restricted to 
> 256Kwords of RAM

Yes.... 18-bit address bus. no mapping.

> whereas the 11/24 seems to support up to 1Mwords?

It _should_ be 2Mwords, but only if you have a KT-24 (MMU)
board installed.  Then, I think it's only the same 256Kwords
as an 11/34, since there's no Unibus Map.

I _think_ that the 11/24 can use the same memory as an 11/44 (256K and 1MB
boards), but someone with contant network access should be able to verify


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