4 ms·
I had an 80386DX (or maybe i386DX, but DX for sure) and it definitely had no FPU. Always wanted one so badly.
by weinzierl 3y ago
I had an 80386DX (or maybe i386DX, but DX for sure) and it definitely had no FPU. Always wanted one so badly.
- hedora 3y agoI was going to correct you, and say the DX had a coprocessor, but the SX did not. Apparently, that’s incorrect, and the difference is bus width. However, at the end of its life, my 386 motherboard was running one of these at 100MHz, with a coprocessor on the daughterboard in the main CPU socket: https://en.m.wikipedia.org/wiki/Evergreen_Technologies https://en.m.wikipedia.org/wiki/Evergreen_Technologies (I think I had an IBM 486, not a Cyrix, fwiw.) Sadly, I’d moved to Linux at that point, and the processor needed a special MSDOS binary to flip into 100MHz mode after boot. Even with the handicap, it booted into X11 + enlightenment at 25MHz (or maybe 33MHz) faster than it could boot into Windows 3.11 at 100MHz.
- johnklos 3y agoPLCC i80387 or compatible can be had from eBay for less than $20, and PGA generally for less than $30 USD.
- sumtechguy 3y agoIf I remember correctly the 486 was just basically, at first, the 386 with the FPU built in. There may have been a couple of new instructions? On that last part I am a bit fuzzy.