Difference between revisions of "FP780 Floating-Point Accelerator"
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* [http://www.bitsavers.org/pdf/dec/vax/780/EK-FP780-TD-001_FP780_Technical_Description_197812.pdf FP780 Floating-Point Accelerator Technical Description Technical Description] (EK-FP780-TD-001) | * [http://www.bitsavers.org/pdf/dec/vax/780/EK-FP780-TD-001_FP780_Technical_Description_197812.pdf FP780 Floating-Point Accelerator Technical Description Technical Description] (EK-FP780-TD-001) | ||
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Revision as of 23:13, 2 January 2022
The FP780 Floating-Point Accelerator was an optional floating point accelerator for the VAX-11/780's KA780 CPU; the floating point instructions 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 hex cards:
| 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 |
