Difference between revisions of "FP11-B Floating-Point Processor"
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* M8115 Fraction Data Path - Low Order | * M8115 Fraction Data Path - Low Order | ||
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| + | * [http://www.bitsavers.org/pdf/dec/pdp11/1145/EK-FP11-MM-003_FP11-B_Floating-Point_Processor_Maintenance_Manual_1974.pdf FP11-B floating point processor maintenance manual] (EK-FP11-MM-003) | ||
| + | * [http://www.bitsavers.org/pdf/dec/pdp11/1145/PDP11_FP11-B_Floating-Point_Processor_Engineering_Drawings_Rev_A_Jul72.pdf FP11-B floating point processor engineering drawings] | ||
[[Category: PDP-11 Processors]] | [[Category: PDP-11 Processors]] | ||
Revision as of 17:57, 6 March 2022
The FP11-B was a FPP used in the PDP-11/45 and PDP-11/70 computers (KB11-A and KB11-B CPU variants thereof, respectively); it was the progenitor of the semi-standard FP11 floating point used in many PDP-11s.
It operated in parallel with the main processor, so that two instructions (one floating point, one regular) could be processed at the same time; unlike the later FP11-C Floating-Point Processor for these machines, it ran entirely asynchronously to the main CPU, and used a clock which was not synchronized to the basic CPU's clock.
Implementation
It plugged into special pre-wired slots in the CPU's backplane, and included the following boards:
- M8112 ROM and ROM Control
- M8113 Exponent and Data Path
- M8114 Fraction Data Path - High Order
- M8115 Fraction Data Path - Low Order
