Difference between revisions of "PDP-11 Extended Instruction Set"
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Revision as of 18:25, 27 October 2022
The Extended Instruction Set is an extension to the basic PDP-11 instruction set; it includes hardware multiply and divide, and also multi-bit shifts. The exact instructions included in the EIS are:
- MUL
- DIV
- ASH
- ASHC
It was not available on the earliest PDP-11 models (the PDP-11/20 and the PDP-11/05); it was available as an option for the PDP-11/40 and the PDP-11/03; it was standard on all other PDP-11 models.
