Difference between revisions of "PDP-11 Extended Instruction Set"

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The '''Extended Instruction Set''' is an extension to the basic [[PDP-11]] [[PDP-11 architecture|instruction set]]; it includes hardware multiply and divide, and also multi-bit shifts. The exact instructions include in the EIS are:
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The '''Extended Instruction Set''' is an extension to the basic [[PDP-11]] [[PDP-11 architecture|instruction set]]; it includes [[hardware]] multiply and divide, and also multi-bit shifts. The exact instructions include in the EIS are:
  
 
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* MUL
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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.
 
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.
  
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{{PDP-11}}
 
{{PDP-11}}

Revision as of 18:03, 20 October 2018

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 include 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.