NEC PC-9801 - INT 18h

Input:

• AH = 00h

Output:

• AX = keystroke

The keystroke is removed from the input buffer.

TODO: Blocks until a keystroke is received?

Input:

• AH = 01h

Output:

• AX = keystroke
• BH = 1 if keystroke in buffer, else 0.

The keystroke is NOT removed from the input buffer.

Input:

• AH = 02h

Output:

• AL = shift flags:
  • bit 0 - SHIFT (pressed)
  • bit 1 - CAPS (held)
  • bit 2 - KANA (held)
  • bit 3 - GRPH (pressed)
  • bit 4 - CTRL (pressed)

TODO

Input:

• AH = 04h
• AL = byte of keystroke bitmap (bits 0-3)

Output

• AH = keystroke bitmap value (byte at 52Ah + (AL & 0x0F))

TODO

Input:

• AH = 00h

Output:

• AX = keystroke
• BH = 1 if keystroke in buffer, 0 otherwise.

The keystroke is removed from the input buffer.

Non-blocking. Seems to be a combination of AH = 01h and AH = 00h.

TODO

TODO

TODO

TODO

Input:

• AH = 0Eh
• DX = offset

TODO

Input:

• AH = 11h

Input:

• AH = 12h

Input:

• AH = 13h
• DX = offset

TODO

Input:

• AH = 14h
• BX:CX = glyph data destination (34 bytes, 16×16)
• DX = glyph code

TODO

Input:

• AH = 16h
• DH = attribute
• DL = character

TODO

TODO

Input:

• AH = 1Ah
• BX:CX = glyph data (34 bytes, 16×16)
• DX = glyph code (must be 0x76xx or 0x77xx, count of custom glyphs limited)

TODO

TODO

Input:

• AH = 40h

TODO

Input:

• AH = 41h

TODO

TODO

TODO

TODO