FP750 Floating-Point Accelerator

The FP750 Floating-Point Accelerator was an optional floating point accelerator for the VAX-11/750's KA750 CPU; some integer instructions were sped up by it as well. The floating point instructions were performed by the microcode when the FP750 was not installed.

It was implemented on one extended hex card, the L0001 FPA Floating Point Accelerator (FPA), which mounted in the VAX-11/750 backplane in slot 1.

Further reading

• FP750 Floating-Point Accelerator Technical Description (EK-FP750-TD) - not online

External links

• VAX Hardware Handbook Volume 1 - the FP750 is covered in Chapter 4 (pp. 171 of the PDF)
• VAX-11/750 Installation Manual (EK-SI75F-IN-001) - the FP750 is covered in Chapter 6 (pg. 113 of the PDF)
• VAX Maintenance Handbook VAX-11/750 (EK-VAXV3-HB-001) - the layout of the FP750 is given on pg. 66 (pg. 78 of the PDF), with a description of the custom gate arrays on the following page, and a block diagram on pp. 185-186 (pg. 197-198)
• FP750 Field Maintenance Print Set (MP01269)
• L0001 (FPA) - FP750 Floating Point Accelerator image