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IBM PC CONVERTIBLE

IBM PC CONVERTIBLE
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0293
0293
B4
OE
0295
E8
0000
0298
A8
80
029A
74
11
;
029C
E8
OlE5 R
029F
B4
00
02A)
BO
00
02A3
B9
OOOA
02A6
02A6
E8
0000
02A9
FE
C4
02AB
E2
F9
02AD
02AD
B4
OB
02AF
E8
0000
02B2
24
7F
02B4
E8
0000
02B7
B3
02
02B9
2B
C9
02BB
02BB
BO
OA
02BD
E6
70
02BF
E4
71
02C)
A8
80
02C3
75
09
02C5
E2
F4
02C7
FE
CB
02C9
75
FO
02CB
EB
)0
90
02CE
02CE
B9
0258
********************************************************************
ROUTINE-NAME:
RTC2_TST
FUNCTION:
CHECK
REAL
TIME
CLOCK
FOR
TIME
UPDATE
FUNCTION.
IF
RTCTlME_BAD
FLAG
IS
SET
INDICATED
INVALID TIME, A
CALL
TO
INITIALIZE_STATUS IS
MADE
TO
SET
THE
RTC
REGISTERS
AND
THE
TlME,DATA,
AND
ALARM
REGISTERS
ARE
SET
TO
O.
ENTRY
CONDITIONS:
PURPOSE
OF
ENTRY:
INPUT
CONDITIONS:
RESTRI
CTI
ONS:
CALLED
BY
POST
TO
CHECK
RTC
TIME
FUNCTION
OS:
DATA
NONE
EXIT
CONDITIONS:
NORMAL
EXIT
CONDITIONS:
AX
= 0
ERROR
EXIT
CONDITIONS:
AH=40
(NON_FATAL
ERR)
AL=63
(RTC
ERR)
REGISTERS
MODIFIED:
AX
RETURNS
STATUS
CODE
FOR
POST
INTERRUPTS:
LEFT
AS
ARE
I
NTERNALL
Y
REFERENCED
ROUTI
NES:
INITIALIZLSTATUS
EXTERNALL
Y
REFERENCED
ROUTINES:
GELRTCNMI, PULRTCNMI
*********************************************************************
RTCZ-TST
PROC
NEAR
MOV
CALL
TEST
JZ
AH,RTCDIAG_STAT
GELRTCNMI
AL
,RTCTlME_BAD
RTC2_02
CHECK
FOR
CLOCK
NOT
SET
JUMP
IF
CLOCK
IS
SET
MUST
INITIALIZE
AND
SET
TIME
TO
0:0:0
DATE
TO
0:0:0
CALL
MOV
MOV
MOV
RTCZ-O)
:
CALL
INC
LOOP
I
NITIALI
ZE_STATUS
AH,RTCTSEC
AL,O
CX,
)0
PULRTCNMI
AH
RTCZ-O)
SET
TIME
AND
DATE
TO
0
SET
REGISTER
TO
0
INCREMENT
REGISTER
NUMBER
INSURE
SELCLOCK
BIT IS
RESET
WAIT
WAIT
RTCZ-02:
MOV
CALL
AND
CALL
MOV
SUB
FOR
UPDATE
RTCZ-03:
MOV
OUT
IN
TEST
JNZ
LOOP
DEC
JNE
JMP
FOR
UPDATE
RTCZ-04:
MOV
AH,RTCMODE
GELRTCNMI
AL,NOT
SELCLOCK
PULRTCNMI
BL,02
CX,CX
TURN
OFF
SELCLOCK
OUTER
LOOP
COUNTER
SET
MAX
LOOP
TO
1.
3
SECONDS
IN
PROGRESS
FLAG
TO
BE
SET
AL,RTCUP_STAT
READ
CLOCK
UPDATE
STATUS
RTCR_PORT
,AL
AL,
RTCD_PORT
AL,RTCUIP
UPDATE
IN
PROGRESS?
RTCZ-04
JUMP
I F
YES
RTCZ-03
KEEP
LOOKING
BL
RTC2_03
RTC2JAIL
JUMP
I F
NEVER
CAME
ON
IN
PROGRESS
FLAG
TO
BE
RESET
CX,600
SET
LOOP
FOR
6
MSEC
2-164 ROM BIOS

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