NPX(4)                OpenBSD Programmer's Manual (i386)                NPX(4)

NAME
     npx - Numeric Processing Extension coprocessor and emulator

SYNOPSIS
     npx0 at isa? port "IO_NPX0" irq 13

DESCRIPTION
     The npx driver enables the use of the system's Numeric Processing Exten-
     sion coprocessor, if one is present.  Numeric processing extensions are
     present in systems with 486DX CPUs and in systems with 387 or 487SX co-
     processors.  The npx driver is required for proper system functioning re-
     gardless of whether or not an NPX is present.

SEE ALSO
     intro(4), isa(4)

BUGS
     There are lots of them, especially on cheap motherboards.  In particular,
     some motherboards do not have the interrupt lines from the NPX to the CPU
     wired properly.

OpenBSD 4.7                      June 20, 2007                               1
