IBM PC CONVERTIBLE Technical Reference page 78

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84 OB MOV AH,RTCMODE
E8 0747 CALL GELRTCNMI
8A FO
MOV DH,AL
; DH
<--
RTC INTERRUPT MODE
; DL
<--
LOW ORDER LCD ADDRESS
24 AF AND AL,NOT PILENABLE+UIE_ENABLE ; DISABLE INTS
E8 0750 R CALL PULRTCNMI
FE C4 INC AH ; READ LAST INTERRUPT STATUS
E8 0747 R
CALL GELRTCNMI
; TO CLEAR IT
F6 06 OOAO R 04 TEST
RTCWAILFLAG,PON-.ALRM-PEND ; IS POWER ON PENDING?
74 OD JZ SUS04A
80 26 OOAO R FB AND
RTCWAILFLAG,NOT PON-.ALRM_PEND ; RESET FLAG
E4 7F IN AL,PWILSTAT
24 F7
AND
AL, NOT HDWR_RESET ; TURN OFF RESET FLAG
OC 01 OR AL, EN_PON-.ALRM ; ENABLE POWER ON BY ALARM
E6 7F OUT PWR_STAT, AL
CHECK SYSTEM PROFILE FOR RESUME OPTION ENABLE OR FORCED RESUME
SUS04A:
F6 06 0016 R 40
75 09
TEST
JNZ
MOV
CALL
TEST
JZ
BIOS_STATUS, F _RESUME
SUS_04B
AH,RTCSYS_PROFl
GELRTCNMI
; IS A FORCED RESUME REQUESTED?
JUMP I F YES
B4 17
E8
0747
A8 80
74 IB
B4 OE
E8 0747
OA C3
OA DB
74 13
F6 Cl 03
75 08
F7 C6 0080
74 05
24 FD
E8 0750
E9 092C R
8A CF
8E C7
2B FF
E4 75
OC 10
E6 75
8C DO
AB
8B C4
AB
8A C6
AA
AL, RESUMLENABLE
SUS_04D
SET DIAGNOSTIC FLAGS IN RTC AREA
SUS_04B:
MOV
AH, RTCDIAG_STAT
CALL GELRTCNMI
OR AL, BL
OR BL, BL
JZ SUS_04E
GET SYSTEM PROFI LE
SYSTEM TO BE RESUMED?
JUMP I F YES
UPDATE DIAGNOSTIC STATUS
SET FLAGS
ANY ERRORS?
; NO THEN SKIP SAVE
TEST
CL, DSP _CLCD+DSP --.MLCD ; I F LCD INOPERABLE, THEN RESET
JNZ
SUS_04C ; ERROR FLAG
TEST SI, DIAGJORCE_SUS ; CHECK FOR FORCE SUSPEND
JZ SUS_04D ; I F NO LCD AND NO FORCE SUSPEND
; THEN DO NOT LOG ANY ERRORS
AND
AL,NOT LCD_NOLACTIVE ; RESET LCD NOT ACTIVE FLAG
SUS_04C:
CALL PULRTCNMI
SUS_04D:
JMP
SUSP _HL T
YES THEN DO NOT SUSPEND
CH CONTAINS LCD CONTROL SAVE, BX CONTAINS SUSPEND SEGMENT ADDRESS
SUS_04E:
MOV CL,BH CL
<---
CURRENT LCD CONTROL
MOV ES, DI SET SEGMENT
SUB DI,DI
CLEAR DESTINATION OFFSET
IN
AL,LCD_DATA GET LCD CONTROL
OR AL,LCDJONT SET FONT ACCESS FLAG
OUT
LCD_DATA,AL
SAVE STACK SEGMENT AND POINTER
MOV
AX,SS
SAVE STACK SEGMENT
STOSW
MOV AX,SP SAVE STACK POINTER
STOSW
SAVE REAL TIME CLOCK INTERRUPT MODE
MOV AL,DH ; SAVE RTC INTERRUPT MODE
STOSB
SAVE LCD SYSTEM CONTROL,MODE CONTROL, AND PARAMETER REGISTERS
ROM BIOS 2-53