PC-9801 MOUSE.SYS specifications

The mouse cursor is drawn in XOR with a size of 16 x 32 dots on the display plane specified by ax=0012h.

ax=0000h, 0001h, 0002h, 0004h, 000bh, 000ch, 000fh are the same as the Microsoft version.
However, the return value of ax=0000h does not include the number of buttons in BX.
Microsoft ax=0005h is separated into 0005h for the left button and 0007h for the right button.
Microsoft ax=0006h is separated into 0006h for the left button and 0008h for the right button.
The Microsoft version of ax=0007h is ax=0010h.
The Microsoft version of ax=0008h is ax=0011h.

Get mouse cursor position and button status
in:
  ax=0003h
out:
  ax=left button status 0:OFF -1:ON
  bx=right button status 0:OFF -1:ON
  cx=horizontal coordinates 0 to 639
  dx=vertical coordinate 0 to 399 (0 to 199 for 640 x 200)

Get left button press information
in:
  ax=0005h
out: 
  ax=left button status 0:OFF -1:ON
  bx=Number of presses since last call
  cx=Last horizontal coordinate pressed 0 to 639
  dx=last vertical coordinate pressed 0 to 399 (0 to 199 for 640 x 200)

Get left button release information
in:
  ax=0006h
out:
  ax=left button status 0:OFF -1:ON
  bx=Number of times release since last call
  cx=last horizontal coordinate pressed 0 to 639
  dx=last vertical coordinate pressed 0 to 399 (0 to 199 for 640 x 200)

Get right button press information
in: in
  ax=0007h
out: 
  ax=right button status 0:OFF -1:ON
  bx=Number of presses since last call
  cx=Last horizontal coordinate pressed 0 to 639
  dx=last vertical coordinate pressed 0 to 399 (0 to 199 for 640 x 200)

Get right button release information
in:
  ax=0008h
out:
  ax=right button status 0:OFF -1:ON
  bx=Number of times release since last call
  cx=last horizontal coordinate pressed 0 to 639
  dx=last vertical coordinate pressed 0 to 399 (0 to 199 for 640 x 200)

Mouse cursor shape setting
in:
  ax=0009h
  bx=horizontal coordinates of cursor center point 0 to 15
  cx=vertical coordinate of cursor center point 0 to 31 (0 to 15 for 640x200)
  es:dx=First address of cursor shape data
        16 x 32 dots   2 x 32 = 64 bytes
        (16 x 16 dots   2 x 16 = 32 bytes for 640 x 200)

Cursor Display Screen Settings
in:
  ax=0012h
  bx=display plane
     Initial value of display plane is 2 (green)

Graphics VRAM settings and implementation status acquisition
in:
  ax=0013h
  bx=VRAM usage screen setting
     0: Plane 0 to 2
     1: Plane 0 to 3
out:
  bx=VRAM implementation status
     0: Plane 3 implementation
    -1: Plane 3 not implemented

  In the Microsoft version, 00fdh

Mouse interrupt allowed
in:
  ax=0014h
  bx=interrupt control
     0: Start interrupt
     1: Interrupt stopped

  In the Microsoft version, 00feh