FP11-B Floating-Point Processor: Difference between revisions
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The '''FP11-B''' was a [[Floating point processor|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-11]]s. | The '''FP11-B''' was a [[Floating point processor|FPP]] used in the [[PDP-11/45]] and [[PDP-11/70]] computers ([[KB11-A CPU|KB11-A]] and [[KB11-B CPU|KB11-B]] [[Central Processing Unit|CPU]] variants thereof, respectively); it was the progenitor of the semi-standard [[FP11 floating point]] used in many [[PDP-11]]s. | ||
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 | 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 [[asynchronous]]ly to the main CPU, and used a clock which was not synchronized to the basic CPU's clock. | ||
==Implementation== | ==Implementation== | ||
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* M8115 Fraction Data Path - Low Order | * M8115 Fraction Data Path - Low Order | ||
==External links== | |||
* [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:UNIBUS | [[Category: PDP-11 UNIBUS Processors]] | ||
Latest revision as of 00:17, 13 October 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
