I have a TriSys Technology board which allows a 486 DX2-50 to be plugged into a 386 socket. Is that of any interest?
Hi it needs to be one that clips on top of the existing CPU. The CPU is soldered on. Do you have anything like that?
I'm afraid not, this one needs an empty socket.
The 386SX was the odd chip out in the SX "named" chips. Both the 80286sx and the 80486sx are just the same chip less the maths co-processor. The 80386SX has a maths co-processor, but only a 16-bit bus, unlike its big brother the 80386 which has a 32-bit bus.
ops add here:-
https://books.google.co.uk/books?id...C4Q6AEwAg#v=onepage&q=Cyrix 486 DRX 2&f=false
shows you really need a 486SRX2 but it won't really make it a 486 as it still has a 16-bit external bus and it will still run like a dog...
The 386SX was the odd chip out in the SX "named" chips. Both the 80286sx and the 80486sx are just the same chip less the maths co-processor. The 80386SX has a maths co-processor, but only a 16-bit bus, unlike its big brother the 80386 which has a 32-bit bus. To be honest I don't think a "Make It 486" on a 386sx board would offer good value for money if you are looking for a speed upgrade.