20 Nov
2007
20 Nov
'07
2:31 a.m.
On Tue, 20 Nov 2007, Alexis wrote:
I'd like to see an 80286 to 80486 upgrade card. It
would need to somehow
multiplex the 32-bit bus onto the 16-bit bus, perhaps running the
multiplexing process at double the CPU clock speed. The SX wasn't 16-bit was
it? Or am I thinking of the 386SX. If it's 16-bit it wouldn't need
multiplexing.
Depending on how you DEFINE "16 bit", the 80386SX is a 16 bit version of
the 32 bit 80386[DX]. It therefore is "relatively" easy to retrofit it to
replace a 80286.
The 80486SX and 80486DX are the same bit sizes. Their differences involve
whether or not the math FPU is included.
I ran an 80386 board in a 5150 (8088) machine. There didn't seem to be
much point to it.