Syntax:
MACHINE MC68000
MACHINE MC68020
MACHINE MC68030
MACHINE MC68040
Operation: Use instructions valid for a given processor. All
subsequent instructions will be checked by the assembler
for compatibility with the given processor. An error will
occur if an incompatible command is encoutered. The
default machine is the 68000. A MACHINE directive
must appear within each file which uses instructions for
other processors.