Meta-Assembler (MASM) Programming Reference Manual

1.3. New Features and Enhancements
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MASM level 6R1 contains the following new features and enhancements:
A new directive ($MACH) to select a desired OS 1100 instruction set.
A new directive ($TMACH) to return the active instruction set.
Introduction
A new storage usage statistic (maximum number of words used) added to the MASM
end line.
Two new directives ($FORCE and $FORCEOFF), used to control a forced relocation
assembly.
The $EXTEND and $PROC directives have been modified to specify 18-bit
addressing.
A new directive ($CROSSREF) to tailor the cross-reference listing.
A new directive ($HDG) to allow the specification of a print heading for the
assembly listing.
The A option on the processor call, to provide additional address checking.
A new MASM warning flag (B) has been implemented to indicate possible address
errors.
An enhanced relocatable output routine, ROR$E, is now used to generate
relocatable elements. MASM now requires a Collector level (33R1 or higher) that
provides and supports ROR$E.
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