IBM PC CONVERTIBLE

02Dl
RTCL05:
02Dl
BO OA
MOV
AL,RTCUP_STAT READ CLOCK UPDATE STATUS
02D3 E6 70
OUT RTCILPORT ,AL
02D5 E4 71
IN
AL,
RTCD_PORT
02D7 A8 80
TEST AL,RTCUIP
UPDATE IN PROGRESS?
02D9
74 14 JZ
RTCLINTS
JUMP I F RESET
02DB E2 F4 LOOP RTCL05
KEEP LOOKING
RTC FAILED TO UPDATE
02DD RTCLFAIL:
02DD B4 OE MOV
AH,RTCDIAG_STAT
02DF E8 0000 CALL GELRTCNMI
02E2 OC 04 OR AL,RTCFAILED
SET CLOCK FAILED FLAG
02E4 E8 0000 E CALL PULRTCNMI
02E7 B8 4063 MOV AX ,4063H
SET NON-FATAL ERROR FLAG
02EA B3 01 MOV BL ,01
SET MFG ERROR CODE
02EC EB 46 90 JMP RTCLEXIT
TEST PERIODIC INTERRUPT
FOR POST AFTER 100 MSECS
02EF RTCLINTS:
02EF
IE
PUSH DS
; SET ES: BX PTR RTCWAILFLAG
02FO 07 POP ES
02Fl BB OOAO R
MOV
BX,OFFSET RTCWAILFLAG ; SET UP FOR INT 15 CALL
02F4
B9 0001
MOV CX,OI
02F7 BA 86AO MOV DX ,86AOH
POST AFTER 100 MSECS
02FA
B8 8300
MOV AX ,8300H
POST ON EVENT FUNCTION CALL
02FD CD 15 INT
ISH
02FF B2 52
MOV DL,82
SET MAX TIME CNT TO 110 MSEC
WAIT
FOR POST FLAG TO BE SET BY NMI
HNDLR - EACH CNT ON DL = 1. 35MS
0301
RTCLWAIT:
0301
26: F6 07 80
TEST BYTE PTR ES: [BX-,PSTD ; WAIT FOR POSTED
FLAG
0305 75 OB
JNZ INLDONE
0307
B9 0102
MOV CX ,MS_DELAY ; DELAY FOR 1 MSEC
030A E2 FE
LOOP
$
030C FE CA
DEC DL
030E 75 Fl
JNE RTCLWAIT
0310 EB 00
JMP SHORT RTCLBAO BAD IF> 110 MSECS
0312
INLOONE:
0312
80 FA OF
CMP DL,15
OKAY IF> = 90 MSECS
0315
77 08
JA RTCLBAD
0317 26: 80 27 7F AND
BYTE PTR ES: [BX-,NOT PSTD ; CLR POSTED FLAG
031B 2B CO SUB AX,AX
; SET GOOD RETURN CODE
031D EB 15 JMP SHORT RTCLEX IT ; EXIT TEST
PERIODIC INTERRUPT TEST FAILED
031F
031F
B4 OB
0321 BO 00
0323 E8 0000
0326
FE C4
0328 E8 0000 E
032B 26: C6 07 00
032F B8 4063
0332 B3 02
RTCLBAD:
MOV
MOV
CALL
INC
CALL
MOV
MOV
MOV
AH,RTCMODE
AL,O
PULRTCNMI
AH
GELRTCNMI
BYTE PTR ES: [BX], 0
AX,4063H
BL,02
PERIODIC INTERRUPT TEST PASSED
0334 RTCLEXIT:
0334
50
PUSH AX
0335 E4 61 IN AL,NMLCNTL
0337 OC 08
OR
AL , 0 I S..J\LARM
0339 E6 61
OUT
NMLCNTL,AL
033B 58
POP AX
033C C3 RET
033D
RTCLTST ENDP
CLEAR ALL INTERRUPT ENABLES
RD STAT TO CLR PENDING INTS
CLEAR WAIT FLAG
SET NON-FATAL ERROR FLAG
SET MFG ERR CODE I NTS BAD
DISABLE ALARM NMI
ROM BIOS 2-165