V4/usr/man/man3/fptrap.3

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.th FPTRAP III 11/18/73
.sh NAME
fptrap \*- floating point interpreter
.sh SYNOPSIS
.ft B
sys	signal; 4; fptrap
.ft R
.sh DESCRIPTION
.it Fptrap
is a simulator of the
11/45 FP11-B floating point unit.
It works by intercepting illegal instruction
faults and examining the offending operation
codes for possible floating point.
.sh FILES
found in /lib/libu.a;
a fake version is in /lib/liba.a
.sh DIAGNOSTICS
A break point trap is given when a real
illegal instruction trap occurs.
.sh "SEE ALSO"
signal(II)
.sh BUGS
Rounding mode is not interpreted.
Its slow.