log(3) - Unix First Edition Manual Page
11/3/71LOG (III)

NAME log -- logarithm base e
SYNOPSIS jsr r5,log
DESCRIPTION The logarithm base e of fr0 is returned in fr0. The floatingpoint simulation should be active in either floating or double

mode, but in single precision integer mode.
FILES kept in /etc/liba.a
SEE_ALSO fptrap
DIAGNOSTICS The error bit (c--bit) is set if the input argument is less thanor equal to zero.