Difference between revisions of "FPP8/A Floating Point Processor"

From Computer History Wiki
Jump to: navigation, search
(Created page with " The '''FPP8/A''' was a floating point processor, nominally for the PDP-8/A, but it can operate on any OMNIBUS PDP-8. it was not part of the Central Proces...")
 
m (fix link)
 
(One intermediate revision by the same user not shown)
Line 1: Line 1:
  
  
The '''FPP8/A''' was a [[floating point processor]], nominally for the [[PDP-8/A]], but it can operate on any [[OMNIBUS]] [[PDP-8]].
+
The '''FPP8/A''' was a [[floating point processor]], nominally for the [[PDP-8/A]], but it can operate in any [[OMNIBUS]] [[PDP-8 family|PDP-8]]. it was not part of the [[Central Processing Unit|CPU]], but used [[Direct Memory Access|DMA]] for its [[instruction]]s and data.
  
it was not part of the [[Central Processing Unit|CPU]], but used [[Direct Memory Access|DMA]] for its [[instruction]]s and data. Its [[floating point]] format provided three and six [[word]] formats, with 12 bits of exponent; it also supported double-word integers.
+
Its [[floating point]] format provided three and six [[word]] formats, with 12 bits of exponent; it also supported double-word integers.
  
 
It used two [[DEC card form factor|hex]] boards, so to fit it into a machine that normally only holds quad boards (such as a [[PDP-8/M]]), one of the fans has to be removed. It has been observed to operate in a PDP-8/M, though.
 
It used two [[DEC card form factor|hex]] boards, so to fit it into a machine that normally only holds quad boards (such as a [[PDP-8/M]]), one of the fans has to be removed. It has been observed to operate in a PDP-8/M, though.

Latest revision as of 21:25, 22 November 2019


The FPP8/A was a floating point processor, nominally for the PDP-8/A, but it can operate in any OMNIBUS PDP-8. it was not part of the CPU, but used DMA for its instructions and data.

Its floating point format provided three and six word formats, with 12 bits of exponent; it also supported double-word integers.

It used two hex boards, so to fit it into a machine that normally only holds quad boards (such as a PDP-8/M), one of the fans has to be removed. It has been observed to operate in a PDP-8/M, though.