PDP-11/34, /34a


1976. Successor of the /05, with a two-board CPU. It had standard 18-bit memory management, but lacked split I/D spaces, supervisor mode and CIS. Also, its floating point performance (FP11-A) is said to be poor. The average cycle time is 450-700 nsec, depending on the type of memory (core vs. semiconductor).

The base version didn't have the calculator-style octal keypad on the front-panel, just two switches, but most costumers chosed to have it.

The /34a was a re-enginered version with better performance (mainly due to the cache).

View of the card-cage
In a smaller rack
A lab system
From another viewpoint