You can identify your Intel287 XL Math CoProcessor by the Intel logo,
shape, notch, dot and pins.
Il 287 XL was designed to
work with most 80286-based computers, except those that were
specifically desidned to use the Intel287 XL Math CoProcessor.
The Intel XL is compatibile with Intel 80286 CPUs that operate at 6, 8
, 10 and 12,5 MHz.
