View source for FP11-C Floating-Point Processor

The '''FP11-C''' was a [[Floating point processor|FPP]] used in the [[PDP-11/45]] and [[PDP-11/70]] computers (the later [[KB11-D CPU|KB11-D]] and [[KB11-C CPU|KB11-C]] [[Central Processing Unit|CPU]] variants thereof, respectively); it was [[program compatible]] with the [[FP11-B Floating-Point Processor]], which was the progenitor of the semi-standard [[FP11 floating point]] used in many later [[PDP-11]]s.

Like the FP11-B, it operated in parallel with the main processor, so that two [[instruction]]s (one floating point, one regular) could be processed at the same time; unlike the FP11-B, it used an internal [[clock]] which is 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:

* M8128 ROM and ROM Control
* M8129 Exponent and Data Path
* M8126 Fraction Data Path - High Order 
* M8127 Fraction Data Path - Low Order

==Further reading==

* ''FP11-C floating-point processor user's manual'' (EK-FP11C-OP-001)

==External links==
 		 		
* [http://www.bitsavers.org/pdf/dec/pdp11/1170/EK-FP11C-MM-01_FP11C_May76.pdf FP11-C floating-point processor maintenance manual] (EK-FP11C-MM-001)	
* [http://www.bitsavers.org/pdf/dec/pdp11/1145/FP11-C_Field_Maintenance_Print_Set_MP00038_NoRev_Dec75.pdf FP11-C Field Maintenance Print Set] (MP00038)

[[Category: PDP-11 Processors]]