Weird Lear-Siegler ADM-3A board - test-drb@ccmp.vtda.org

29 May 2018

...
  From: Eric Smith 
...
  The NS455 has firmware in masked ROM ...  The NS405
has the masked ROM
 disabled 
Ah, thanks muchly! Do you know of _any_ documentation extant for the 455? I
couldn't find anything..

...
  I've been searching for the NS405 manual (not the
datasheet) for a very
 long time. 
The data sheet seems pretty complete - are you sure there ever was a manual?

    Noel