Intel 80287XL is a FPU for 16-bit CPU 80286. It works as the I/O device for 286, and it can run with other CPUs.
I have connected 287XL to Arduino Mega, and investigated how to operate it.
This repository contains a circuit connection diagram and a test code drawing Mandelbrot ASCIIART.
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Running 80287XL with Arduino Mega
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4sun5bu/287Hack
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