PDP11/55 sells on Ebay for 5K$ - was it really the fastest 11?

Guy Sotomayor ggs at shiresoft.com
Mon Apr 18 10:24:15 CDT 2005

On Sun, 2005-04-17 at 23:24 -0400, Heinz Wolter wrote:

> Isn't a 55 just a 45 with bipolar instead of core? or was that a 50?

Actually, the 11/45 came in 3 variations originally:
      * core
      * upto 64KW of MOS on the fastbus
      * upto 64KW of Bipolar on the fastbus

The 11/50 was identical to the 11/45 and came standard with either MOS
or Bipolar on the fastbus.

The 11/55 is sort of half way between the 11/45 and 11/70 CPU-wise.
Most of the CPU boards are from the 11/45, but there are a number that
came from the 11/70 (including the FPU boards).  It is a distinct CPU
from the 11/45 (as designated by the KB11D).

TTFN - Guy

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