The 387 FPU

Emulates:	PC
Processor:	Cyrix 486slc@??Mhz, optional 387 FPU (PLCC)
RAM:	1MB (Expandable to 8MB with ZIPs, 16MB with a ZIP to SIMM converter)
Graphics Emulation:	MDA CGA (can use real ISA graphics cards)
Sound Emulation:	Real PC speaker (can use real ISA sound cards)

This bridgeboard is actually a Commodore A2386SX card which was adapted by Elite Microsystems to accept a 486 processor, before being shipped.

Please see the A2386SX.