IBM PC CONVERTIBLE

0035
0037
0057
0058
0085
LOCAL
EXTRN Kll BYTE
EXTRN K12 BYTE
EXTRN K13 BYTE
EXTRN K14 BYTE
EXTRN K15 BYTE
EXTRN K30 BYTE
EQUATES
P60_SLASH_SC
EQU
P60...ASTRICSC
EQU
F1LMAKE_SC
EQU
FlLMAKE_SC
EQU
F1LBASE...ASCI I
EQU
35H
37H
057H
058H
D85H
P60 MAKE SC FOR BASE /
P60 MAKE SC FOR BASE *
Fll MAKE SC AT NMI & P60 LEVEL
F12 MAKE SC AT NMI & P60 LEVEL
Fll EXTENDED ASCI I (BASE)
Keyboard Interrupt Hex 16 (KYBD_IO)
; **** I NT 16H ***********************************************************
ROUTINE NAME: KYBD_IO (INT 16H)
FUNCTION: PROVIDE ACCESS TO THE ASCII KEYBOARD BUFFER AND CLICKER.
INPUT CONDITIONS:
(AH)=O PROCESS SYSTEM REQUEST KEY IF THE KEY IS ACTIVE ELSE
READ THE NEXT ASCI I CHARACTER STRUCK FROM THE KEYBOARD
RETURN THE RESULT IN (AL), SCAN CODE IN (AH)
(AH)=l PROCESS SYSTEM REQUEST KEY IF THE KEY IS ACTIVE ELSE
RESET THE Z FLAG TO INDICATE IF AN ASCII CHARACTER IS
AVAILABLE TO BE READ.
(ZF) =1 -- NO CODE AVA I LABLE
(ZF) =0 -- CODE IS AVAILABLE
IF ZF = 0, THE NEXT CHARACTER IN THE BUFFER TO BE READ
IS IN AX, AND THE ENTRY REMAINS IN THE BUFFER
(AH)=2 RETURN THE CURRENT SHIFT STATUS IN AL REGISTER
THE BIT SETTINGS FOR THIS CODE ARE INDICATED IN THE
THE EQUATES FOR KBJLAG
(AH) =4 TURN ON/OFF KEYBOARD CLICK STATE BY THE VALUE IN AL
AS FOLLOWS:
(AL)=O TURN OFF KEYBOARD CLICK.
(AL)=l TURN ON KEYBOARD CLICK.
AL IS RANGE CHECKED. THE STATE IS UNALTERED IF
AL <> 1,0.
NOTE: FUNCTION CALLS OTHER THAN THE ABOVE RESULT IN NO OPERATION
EXIT CONDITIONS: FUNCTIONS 0, 2, 4 IRET BACK TO CALLER
FUNCTION 1 RET 2 BACK TO CALLER
REGISTERS MODIFIED: AX, Z FLAG
INTERRUPTS: FOR FUNCTIONS 2 AND 4, I FLAG IS LEFT AS IS
FOR FUNCTION 0, INTERRUPTS ARE FORCED OFF (CLI) AND FORCED 0
(STI) BEFORE DOING IRET
FOR FUNCTION 1, INTERRUPTS ARE FORCED OFF (CLI) AND FORCED 0
(STI) BEFORE DOING RET 2
INTERNALLY REFERENCED ROUTINES: PTR-INC
; EXTERNALLY REFERENCED ROUTINES: DDS, INT 15H
; ************************************************************************
2-66 ROM BIOS