INT 60 u - HP 95LX System Manager - SCREEN SERVICE "M_XCHG" DI = 0303h STACK: 2 WORDs unused dummies (for calls from high level languages) WORD ??? WORD ??? WORD ??? WORD ??? DWORDDoubleword; four bytes. Commonly used to hold a 32-bit segment:offset or selector:offset address. pointer to ??? Return: ??? STACK unchanged