On your other post, I think you're thinking of the
Cyrix Cx486SLC.
486 instruction set with all the limitations of the 386SX--small bus
width, no math coprocessor, 16MB of addressability. Fabbed by TI, I
believe.
I suspect that is what's one the kludgeboard in this machine. It would
make sense for a chip to go in place of an 80286, with only 24 address
pins and 16 data pins on the socket. And there is certainly a sepearte
maths comprocessor chip on the PCB too.
Anyway, the only reason I stuck this board in was to run linux, and it
does that with no problems.
-tony