IBM PC CONVERTIBLE User Manual

0062 IF
0063 CF
0064
POP
IRET
DS
KYBD_IO ENDP
RECOVER REGISTERS
RETURN TO CAllER
Level 1 Interrupt Hex 9 (KYBD_INT9)
0064
0064
FB
0065 50
0066 53
0067 51
0068 52
0069 56
006A 57
006B IE
006C 06
006D FC
006E E8 0000
0071
E4 60
0073 50
0074 E4 61
0076
8A EO
0078 OC 80
007A E6 61
007C 86 EO
007E E6 61
0080 58
0081
B4 4F
** I NT 9 *************************************************************
ROUTINE-NAME: KYBD_INT9
FUNCTION: THIS ROUTINE IS ACTIVATED BY A INTERRUPT 9 (HARDWARE INT 1)
IT READS PORT 60 AND PROCESSES THAT SCAN CODE BY EITHER SETTING/
RESETTING ITS FLAG OR TRANSLATING THE SCAN CODE INTO AN EXTENDED
ASCII CODE AND PLACING IT IN THE ASCII BUFFER. THIS INTERRUPT
SERVICE ROUTINE TRIGGERS THE KYBD_ClR NMI. THE NMI DOES NOT
GO INTO EFFECT UNTIL A NON-SPECIFIC EO! !S DONE NEAR THE EXIT OF
THIS ROUTINE.
ENTRY CONDITIONS:
PURPOSE OF ENTRY: PROCESS THE SCAN CODE IN PORT 60H
INPUT CONDITIONS: cs: ROMCODE SEGMENT
RESTRI CTIONS:
EXIT CONDITIONS:
NORMAL EXIT CONDITIONS: ASCII BFR HAS 2 BYTE EXTENDED ASCII CODE
ERROR EXIT CONDITIONS: N/A
REGISTERS MODIFIED: NONE
INTERRUPTS: FORCED ON UPON ENTRY (STI)
INTERNAll Y REFERENCED ROUTINES: PTR_I NC
EXTERNAllY REFERENCED ROUTINES: DDS, INT 5H, KB_NOISE, INT 15H, INT IBH,
**********************************************************************
KYBD_INT9 PROC
FAR
STI
AllOW
FURTHER INTERRUPTS
PUSH AX
PUSH BX
PUSH CX
PUSH DX
PUSH 51
PUSH DI
PUSH DS
PUSH ES
ClD FORWARD DIRECTION
CAll DDS
IN
Al,KB_DATA
READ I N THE CHARACTER
PUSH AX SAVE IT
IN
AL,
KB_CTL GET THE CONTROL PORT
MOV AH,Al SAVE VALUE
OR Al,80H RESET BIT FOR KEYBOARD
OUT
KB_CTL,Al
XCHG AH,Al
GET BACK ORIGINAL CONTROL
OUT
KB_CTl,Al
KB HAS BEEN RESET
NOTE: THIS WIll GENERATE A
KB_ClR NMI UPON INT9 EOI.
POP AX RECOVER SCAN CODE
ALLOW OPERATING SYSTEM INTERCEPT (INT 15 FUNCTION 4FH)
(AH = 4FH , Al = SCAN CODE)
MOV AH,4FH
2-68 ROM BIOS

IBM PC CONVERTIBLE Specifications

General

Brand	IBM
Model	PC CONVERTIBLE
Category	Laptop
Language	English