Command line syntax and options as listed in the 5.0 manual:

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

Option	Action
/A	- Writes segments in alphabetical order
/Bnumber	- Sets buffer size
/C	- Specifies a cross-reference file
/D	- Creates Pass 1 listing
/Dsymbol[=value]	- Defines assembler symbol
/E	- Creates code for emulated floating-point instructions
/H	- Lists command-line syntax and all assembler options
/Ipath	- Sets include-file search path
/L	- Specifies an assembly-listing file
/ML	- Makes names case sensitive
/MU	- Converts names to uppercase letters
/MX	- Makes public and external names case sensitive
/N	- Suppresses tables in listing file
/P	- Checks for impure code
/S	- Writes segments in source-code order
/T	- Suppresses messages for successful assembly
/V	- Displays extra statistics to screen
/W{ 0 | 1 | 2 }	- Sets error-display level
/X	- Includes false conditionals in listings
/Z	- Displays error lines on screen
/ZD	- Puts line-number information in the object file
/ZI	- Puts symbolic and line-number information in the object file