Command line syntax and options as listed in the 4.0 manual:

        MASM sourcefile [,[objectfile] [,[listingfile] [,[crossreferencefile]]]] [options] [;]

Option	Action
/A	- Writes segments in alphabetical order
/S	- Writes segments in source-code order
/Bnumber	- Sets buffer size
/C	- Specifies a cross-reference file
/L	- Specifies an assembly-listing file
/D	- Creates Pass 1 listing
/Dsymbol	- Defines assembler symbol
/Ipath	- Set include file search path
/ML	- Preserves case sensitivity in names
/MX	- Preserves case sensitivity in public and external names
/MU	- Converts names to uppercase
/N	- Suppresses tables in listing file
/P	- Checks for impure code
/R	- Creates code for real floating-point instructions
/E	- Creates code for emulated floating-point instructions
/T	- Suppresses messages for successful assembly
/V	- Displays extra statistics to screen
/X	- Includes false conditionals in listings
/Z	- Displays error lines on screen