table of contents
|NPX(4)||Device Drivers Manual (i386)||NPX(4)|
NAME¶npx — Numeric Processing Extension coprocessor
DESCRIPTION¶The npx driver enables the use of the system's Numeric Processing Extension coprocessor. Numeric processing extensions are present in systems with 486DX CPUs and in systems with 387 or 487SX coprocessors. The npx driver is required for proper system functioning. If there is no NPX in the system, the system will not boot. The flags for npx0 are:
- do not use the NPX registers to optimize bcopy.
- do not use the NPX registers to optimize bzero.
- do not use the NPX registers to optimize copyin or copyout.
- cpu I586_CPU is an option
- the CPU is an i586 (perhaps not a Pentium)
- the probe for npx0 succeeds
- INT 16 exception handling works.
BUGS¶There are lots of them, especially on old cheap motherboards. In particular, some motherboards do not have the interrupt lines from the NPX to the CPU wired properly.
|August 28, 1993||Debian|