FAIL. AIM-226

This is a reference manual for FAIL, a fast, one-pass assembler for
PDP-10 and PDP-6 machine language. FAIL statements,
pseudo-operations, macros, and conditional assembly features are
described. Although FAIL uses substantially more main memory than
MACRO-10, it assembles typical programs about five times faster.
FAIL assembles the entire Stanford time-sharing operating system (two
million characters) in less than four minutes of CPU time on a KA-10
processor. FAIL permits an ALGOL-style block structure which
provides a way of localizing the usage of some symbols to certain
parts of the program, such that the same symbol name can be used to
mean different things in different blocks.