INT 18 - NEC PC-9800 series - KEYBOARD - KEY PRESSED
AH = 04h
???
Return: ???
Note:   details are not available at this time
SeeAlso: AH=02h,INT 16/AH=00h,INT 16/AH=01h,INT 16/AH=02h

See also: 1800

1804 - NEC PC-9800 series - KEYBOARD - KEY PRESSED