Intel D80287 6
Persyst Mono II
The slowest 287 you can find. These FPU's can pair up with 286 and early 386 (1985, 1986) systems. At the time when Intel released their 387 the 386-motherboards were equipped with the new socket for the 387 and dropped the 287-support.
Later models were dubbed 80287XL and feature a 387 architecture. They can still work with 286 CPU's.
