FPP8/A Floating Point Processor: Difference between revisions
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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 on any [[OMNIBUS]] [[PDP-8]]. 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. | |||
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. | ||
Revision as of 00:14, 20 September 2018
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 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.
