Back to General and Gameplay Programming

FPU detection

General and Gameplay Programming Programming

Started by Tolik November 01, 2000 10:47 PM

1 comment, last by Tolik 24 years, 2 months ago

Tolik

Author

122

November 01, 2000 10:47 PM

I know how to detect FPU, using CPUID instruction, but with instruction supports by 486DX4 or better. Anyone, know to detect FPU in older processors(386, 486SX, 486DX)?

jenova

122

November 02, 2000 08:52 AM

to detect the FPU on a 386/486 what you need to do is write to the FPU status register and then read the status register back.
the FNINIT and FNSTENV instructions.

To the vast majority of mankind, nothing is more agreeable than to escape the need for mental exertion... To most people, nothing is more troublesome than the effort of thinking.