IBM PC CONVERTIBLE

System Status Services (SYS-STATUS)
02Cl
02Cl
53
02C2 B4 21
02C4 E8 0000
02C7 24 10
02C9 8A 08
02CB E4 7F
02CD 24 CO
02CF OA 08
0201 B4 OE
0203 E8 0000
0206
AS 80
0208 74 03
02DA 80 CB 20
0200
0200
E4 7C
INT 15H
ROUTINE-NAME: SYS_STATUS (AH = 43H)
FUNCTION: THIS ROUTINE RETURNS THE CURRENT SYSTEM STATUS IN THE
AL REGISTER AS DEFINED BELOW.
INPUT: NONE.
OUTPUT: AL CONTAINS SYSTEM STATUS AS FOLLOWS:
17161514131211101
1
1 ----> LCD DETACHED
1 ----> RESERVED
1 ----> RS-232 POWERED ON
----> MODEM POWERED ON
----> POWER ACTIVATED BY RTC ALARM
----> STANDBY POWER LOST (RTC TIME BAD)
----> OPERATING ON EXTERNAL POWER
----> LOW BATTERY
REGISTERS
MODIFIED: AX
SYS_STATUS PROC NEAR
PUSH BX
MOV AH, RTCSYS_STAT
CALL GELRTCREG
AND AL, PON_ALRM
MOV BL,AL
IN AL,PWR_STAT
AND AL,LOW_BAT+EXLPWR
OR BL,AL
MOV AH, RTCDIAG_STAT
CALL GELRTCREG
TEST AL, RTCTIME_BAD
JZ SYS_STATl
OR BL,20H
SYS_STATl :
IN AL,KYBD_CNTL
SAVE BX
SELECT POWER ON STAT
GET POWER ON STAT
SAVE ONLY POWER ON
ALARM STATUS
GET CURRENT POWER STATUS
SAVE ONLY POWER STATUS
SET COMBINED POWER STATS
SELECT RTC TIME
GET RTC TIME
IS RTC TIME BAD?
NO, THEN GO READ SETTINGS
YES, SET RTC TIME BAD
STANDBY POWER LOST
GET COMMO POWER STATUS
2-182 ROM BIOS