Real-Time Clock Nmi (Rtcalarm_Nmi) - IBM PC CONVERTIBLE Technical Reference

0523
0523 C3
0524
0524
RETURN TO CALLER
XL
noo:
RET
KYBD_XL T ENDP
SUBROUTINE NUM_STATE_FIX
IN QUEUE
RETURN
PROCEDURE END
THIS ROUTINE MAKES THE NUM_STATE FLAG REFLECT THE KEYPAD_STATE FLAG.
INPUT: NONE OUTPUT: NUM_STATE SET OR RESET
NUM_STATLFIX PROC NEAR
0524 80 26 0017 R OF AND KB_FLAG,NOT NUM_STATE ; TURN OFF NUM_STATE
0529 F6 06 00B4 R 04 TEST KB_NMLCNTL,KEYPAD_STATE; IS KEYPAD IN ACTIVE STATE?
052E 74 05 JZ NSF_RET ; NO, LEAVE NUM_STATE OFF
0530 80 OE 0017 R 20 OR KBJLAG,NUM_STATE; YES, TURN NUM_STATE ON
0535
0535 C3
0536
0536
0536 B4 00
0538 AO 0049 R
053B CD 10
0530 2B 02
053F BD 0000
0542 OE
0543 07
0544 E8 0000
0547 E4 7F
0549 24 F3
054B E6 7F
0540
0540 E4 70
054F EB FC
0551
NSF_RET:
RET
NUM_STATE_FIX ENDP
THIS ROUTINE IS ACTIVATED WHEN THE NMLFLIH DETECTES AN I/O CHECK
IT CAUSES A PARITY CHECK ICON TO BE DISPLAYED ON THE ACTIVE DISPLAY AFTER
THE DISPLAY SCREEN IS CLEARED. SUSPEND IS DISABLED AND THE KEYBOARD IS
WAITING FOR A FUNCTION CONTROL DELETE KEY SEQUENCE.
CHAN_CHK PROC NEAR
MOV AH,O
MOV AL, CRLMODE
INT lOH
SUB DX,DX
MOV BP ,OFFSET PAR_CHK
PUSH CS
INIT AND SET MODE FOR VIDEO
CALL V I DEO_JO PROCEDURE
SET ROW/COLUMN FOR ICON
GET ADDRESS OF PARITY CHECK
POP ES ES:BP CONTAIN ICON ADDRESS
CALL ICON_PR DISPLAY CHECK ICON
IN AL,PWILSTAT ; DISABLE SUSPEND NMI
AND AL,NOT EN_SUS_NMI+HDWR_RESET ;
OUT PWR_STAT ,AL
CHAN_STOP:
IN AL,7DH
JMP SHORT CHAN_STOP
KEEP READING KEYBOARD
FOR RESET SEQUENCE
Real-Time Clock NMI
(RTC_ALARM_NMI)
; ***************************************************************
RTCALARM_NMI -- REAL TIME CLOCK INTERRUPT HANDLER
THIS ROUTINE HANDLES THE PERIODIC AND ALARM INTERRUPTS FROM
THE NON-VOLATILE TIMER. INPUT FREQUENCY IS 1.024 KHZ
OR APPROXIMATELY 1024 INTERRUPTS EVERY SECOND FOR THE
PERIODIC INTERRUPT. FOR THE ALARM FUNCTION, AN INTERRUPT WILL
OCCUR AT THE DESIGNATED TIME.
2-44 ROM BIOS