Int 33 Fn 246C  - Logitech Mouse - Get Parameters And Reset Serial Mouse   [M]

   AX = 246Ch
   ES:DX -> parameter table buffer (see below)

Return: AX = FFFFh if driver installed for serial mouse

See Also: AX=0000h,AX=256Ch/BX=0000h,AX=256Ch/BX=0001h,AX=256Ch/BX=0003h

Format of parameter table:
Offset Size    Description
 00h   WORD    baud rate divided by 100  (serial mouse only)
 02h   WORD    emulation         (serial mouse only)
 04h   WORD    report rate       (serial mouse only)
 06h   WORD    firmware revision     (serial mouse only)
 08h   WORD    00h           (serial mouse only)
 0Ah   WORD    port              (serial mouse only)
 0Ch   WORD    physical buttons
 0Eh   WORD    logical buttons