4A INT 4A C - SYSTEM - USER ALARM HANDLER
4A INT 4A - Z100 - Slave 8259 - S100 vectored line 2
4A INT 4A - Tandy 2000 - PRINT SCREEN
4A INT 4A - Acorn BBC Master 512 - "OSWORD" - MISC FUNCTIONS USING CONTROL BLOCK
4A00 INT 4A - TI Professional PC - KEYBOARD - GET KEYPRESS
4A01 INT 4A - TI Professional PC - KEYBOARD - GET KEYBOARD STATUS
4A02 INT 4A - TI Professional PC - KEYBOARD - GET KEYBOARD MODE
4A03 INT 4A - TI Professional PC - KEYBOARD - FLUSH KEYBOARD BUFFER
4A04 INT 4A - TI Professional PC - KEYBOARD - SEND COMMAND TO KEYBOARD
4A05 INT 4A - TI Professional PC - KEYBOARD - INSERT CHARACTER INTO KEYBOARD BUFFER