WonderWitch/FreyaBIOS/Key

The Display interrupt provides helper functions for accessing the WonderSwan's keypad.

Interrupts

INT $11/AH=$00 - key_press_check

• AH = $00

Return:

• AX = A bitmask containing the currently held keys.

15  bit  8  7  bit  0
 ---- ----  ---- ----
 .... 4321  4321 bas.
      ||||  |||| |||
      ||||  |||| ||+- Start
      ||||  |||| |+-- A
      ||||  |||| +--- B
      ||||  ++++----- X1/X2/X3/X4
      ++++----------- Y1/Y2/Y3/Y4

INT $12/AH=$01 - key_hit_check

• AH = $01

Return:

• AX = A bitmask containing the newly pressed keys, if any.

INT $11/AH=$02 - key_wait

• AH = $01

Return:

• AX = A bitmask containing the newly pressed keys.

This call blocks until a key is pressed.

INT $11/AH=$03 - key_set_repeat

• AH = $03
• BL = Key repeat delay, in frames
• BH = Key repeat rate, in frames

INT $11/AH=$04 - key_get_repeat

• AH = $04

Return:

• AL = Key repeat delay, in frames
• AH = Key repeat rate, in frames

INT $11/AH=$05 - key_hit_check_with_repeat

• AH = $01

Return:

• AX = A bitmask containing the newly pressed keys, if any.

For this call, the repeat delay/rate configuration is taken into account.