11/23 addressing, was Re: [HECnet] Silly RSX questions....

[Dave McGuire]

On 07/08/2012 11:54 AM, G  ran   hling wrote:
Just to "point on the nitty gritty details"

To my knowledge; M+ will run on 11/23+ but not upon 11/23   ! (22 bit
adressing required).

  This is not quite true!   Most KDF11-A (dual-wide, non-"+") 11/23 CPUs
DO in fact support 22-bit addressing.

  It is a common misconception that all dual-wide 11/23 CPUs only have
18-bit addressing.   It is only the early revs of the dual-wide board
that are limited to 18-bit addressing; prior to Rev C.   The 11/23 was a
very popular system in its day; DEC made a LOT of them...the vast
majority of the boards you'll see in the field are Rev C or later.

                          -Dave

-- 
Dave McGuire, AK4HZ
New Kensington, PA