IBM PC CONVERTIBLE Technical Reference page 234

EXIT CONDITIONS: DATA IN REGISTER MODIFIED
REGISTERS MODIFIED: NONE
*********************************************************************
07C8
PULRTCREG PROC NEAR
07C8
9C PUSHF
07C9
FA CLI
01 SABL E INTERRUPTS
07CA 53 PUSH BX
OlCB 8A 08 MOV BL,AL
BL
<--
DATA
07CD E4 72 IN AL, CLOCK-CTL
07CF 8A F8 MOV BH,AL BH
<--
NMI CONTROL SAVE
0701 24 OF AND AL,NOT GLOBAL_NMI DISABLE NMI
07D3 E6 72 OUT CLOCK-CTL, AL
07D5 8A C4 MOV AL,AH GET ADDRESS
07D7 E6 70
OUT
RTCR_PORT ,AL WRITE RAM ADDRESS
0709
8A C3 MOV AL,BL GET DATA
07DB
E6 71 OUT
RTCD_PORT ,AL
WRITE DATA
07DD 8A C7
MOV AL,BH
07DF
E6 72
OUT CLOCK_CTL, AL RESTORE NMI STATE
07El 8A C3 MOV AL,BL RESTORE DATA
07E3 5B POP BX
07E4 90 POPF RESTORE INTERRUPT STATE
07E5 C3 RET
07E6 PULRTCREG
ENDP
Setup for Battery Savings
(BAT _SA V -SETUP)
07E6
07E6
B4 OB
07E8
E8 07AA R
07EB
8B 08
07ED 80 CB 10
D7FO B9 0004
07F3 B4 19
D7F5
E8 07AA R
07F8 3C 00
07FA
75 10
07FC
FE C4
07FE
E2 F5
0800 B4 17
0802 E8 07AA R
0805 A8 40
0807 75 03
0809 80 E3 EF
******************************************************************
BALSALSETUP
THIS ROUTINE ENABLES THE RTC 1 SEC UPDATE ENDED INTERRUPT AS A
TIME BASE FOR THE LCD BLANK AND THE SYSTEM POWER OFF OPTIONS
IF THE SYSTEM PROFILE INDICATES THAT ONE OR BOTH OF THESE
OPTIONS ARE ENABLED. I F NOT OR WE ARE ON EXTERNAL PWR THEN THE
INTERRUPT IS DISABLED.
RESTRICTIONS: RTC, AND SYSTEM SUSPEND NMIS MUST BE DISABLED
BEFORE CALL TO THIS ROUTINE
REGISTERS MODIFIED:
AX,BX,CX
BALSALSETUP PROC
MOV AH, RTCMODE
CALL GELRTCREG
MOV BX,AX
BL,UIE_ENABLE
CX,4
NEAR
OR
MOV
MOV AH, RTCLCD_I NACT
GET CURRENT MODE
SAVE ADDRESS AND MODE
DEFAULT TO SET ENABLE ON
CHECK THE FOUR TIME VALUES
SPECIFY BEG
@
OF PROFILE
BALSOI : CALL GELRTCREG
CMP
JNE
INC
LOOP
MOV
CALL
TEST
JNZ
AL,O
BALS02
AH
BALSOI
AH,RTCSYS_PROFl
GELRTCREG
AL,LOWBALENABLE
BALS02
CHECK TIME FOR 0
I F NOT 0, OPTION ACTIVATED
LOOP TO CHECK NEXT BYTE
GET LOW BAT WARNING STATE
JUMP IF WARNING ENABLED
DISABLE UPDATE ENDED INTERRUPT (BATTERY SAVINGS MODE IS DISABLED)
AND BL, NOT U I E_ENABL E ; TURN OFF INTERRUPT
ROM BIOS 2-209