View source for FP780 Floating-Point Accelerator

The '''FP780 Floating-Point Accelerator''' was an optional [[floating point accelerator]] for the [[VAX-11/780]]'s [[KA780 CPU]]; the floating point [[instruction]]s were performed by the microcode when it was not installed. It was installed in slots 24 through 28 of the [[CPU]]'s [[backplane]]. 

==Implementation==

It was implemented on five [[DEC card form factor|hex]] cards:

{| class="wikitable"
! Slot !! Board !! Acronym !! Function
|-
| 24 || M8285 || FNM || Normalization and fraction division
|-
| 25 || M8286 || FMH || Fraction multiplication (most significant bits)
|-
| 26 || M8287 || FML || Fraction multiplication (least significant bits)
|-
| 27 || M8288 || FAD || Fraction addition and subtraction
|-
| 28 || M8289 || FCT || Exponent manipulation and FPA control
|}

{{semi-stub}}

==External links==

* [http://www.bitsavers.org/pdf/dec/vax/780/EK-FP780-TD-001_FP780_Technical_Description_197812.pdf FP780 Floating-Point Accelerator Technical Description] (EK-FP780-TD-001)

[[Category: DEC VAX Processors]]