Hobbyist builds a homebrew Intel 8086 ISA accelerator card — improves integer multiplication 2.5×

A hobbyist named Brad built an ISA accelerator card that offloads MUL instructions for Intel 8086/8088 PCs.

The card uses a TRW MPY12HJ 12×12 parallel multiplier chip from the late 1970s/early 1980s.

In demonstrations the accelerator made integer multiplication about 2.5× faster, but precompiled apps do not use it without source changes.