2.9BSD/usr/src/ucb/pascal/utilities/fpterp/README

This directory contains a floating point interpreter for a separate I/D
(11/70, 11/45) machine without floating point.  It is out of date;
it requires the fetchi system call, which is now a local syscall.
To  convert, change all instances of
	sys	fetchi
to
	sys	local; fetch

and then put

	.data
fetch:	sys	fetchi

someplace like fpx.s.  Remove the definition of fetchi, and assemble
with /usr/include/sys.s.