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This led me to this gem on Wikipedia: The i487SX (P23N) was marketed as a floating-point unit coprocessor for Intel i486SX machines. It actually contained a ful
by morsch 5y ago
This led me to this gem on Wikipedia: The i487SX (P23N) was marketed as a floating-point unit coprocessor for Intel i486SX machines. It actually contained a full-blown i486DX implementation. When installed into an i486SX system, the i487 disabled the main CPU and took over all CPU operations. The i487 took measures to detect the presence of an i486SX and would not function without the original CPU in place.
https://en.m.wikipedia.org/wiki/X87#80487 https://en.m.wikipedia.org/wiki/X87#80487
- SavantIdiot 5y agoThere was also 486 in a 386 socket called Sidewinder at Intel, but it never shipped. It had an ASIC on the back of the package. There's no record of this anywhere on Google.
- walrus01 5y agoThe cyrix "486DLC" which wasn't really as fast as an Intel 486dx/25 or 33 came in a standard interface to mount into a 386DX socket on most taiwanese clone motherboards.
- happycube 5y agoWasn't that RapidCad?
- Lammy 5y agoThey probably didn't want to do anything to prolong any 386 after AMD reaffirmed their license to make them: https://www.latimes.com/archives/la-xpm-1991-03-02-fi-1893-story.html https://www.latimes.com/archives/la-xpm-1991-03-02-fi-1893-s...
- gerdesj 5y agoI was bought a 80287 maths co pro unit for my PC so I could run AutoCAD. That was a 80286 with 1MB of RAM and a 20MB hard disc.