Difference between revisions of "FP11-E Floating Point Processor"
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* [http://www.bitsavers.org/pdf/dec/pdp11/1160/MP-00429_FP11-E_Engineering_Drawings_Jun77.pdf FP11-E Field Maintenance Print Set] (MP00429) | * [http://www.bitsavers.org/pdf/dec/pdp11/1160/MP-00429_FP11-E_Engineering_Drawings_Jun77.pdf FP11-E Field Maintenance Print Set] (MP00429) | ||
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Latest revision as of 01:19, 13 October 2022
The FP11-E Floating Point Processor is the optional hardware floating point unit for the KD11-K CPU of the PDP-11/60. The KD11-K provided the full FP11 floating point using microcode; the FP11-E was an option which provided considerably improved floating point performance.
It was a 4 hex board co-processor:
- Floating Point Next Micro-Address (FNUA - M7878)
- Floating Point Exponent (FLTEXP - M7879)
- Multiplying Network (MULNET - M7880)
- Floating Point ALU (FALU - M7881)
which mounted in slots 8-11 of the CPU's backplane. The main CPU can detect the presence of the FP11-E, and, if present, uses it to perform any floating point instructions found in the program.
Electrically, it connected directly to the CPU and is controlled by it; unidirectional data buses are provided to move information (including instructions) from the CPU to the FPP, and vice versa.
The FP11-E has its own microcode, 88 bits wide, to control its operation, and interaction with the main CPU.
Further reading
- FP11-E floating-point processor technical manual (EK-FP11E-TM-001)
External links
- FP11-E floating-point processor user's guide (EK-FP11E-UG-001)
- FP11-E Field Maintenance Print Set (MP00429)
