IBM PC CONVERTIBLE

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PUBLICS DECLARATION
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PUBLIC
PUBLIC
PUBLIC
PUBLIC
PUBLI C
TOD_PROC
SELTOD
TMRO_INT8
INITIALIZE-STATUS
RTCLTST
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;* S TAR T 0 F COD E *
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Time of Day Interrupt Hex lA
(TOD_PROC)
SUBTTL TOD_PROC
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ROUTINE-NAME: TOD_PROC
([NT IAH)
FUNCTION: ALLOW REAL TIME CLOCK TO BE READ/SET
ALLOW TIMER DATA AREA TO BE READ/SET
ENTRY AND EXIT CONDITIONS:
1. PURPOSE OF ENTRY: READ THE CURRENT CLOCK SETTING
(TIMER DATA AREA)
INPUT CONDITIONS: AH = OOH
NORMAL EXIT CONDITIONS: AL = 0 IF TIMER HAS NOT PASSED
24 HRS SINCE LAST READ.
<>0 I F ON ANOTHER DAY.
ex = HIGH WORD OF COUNT
OX = LOW WORD OF COUNT
REGISTERS MODIFIED: AL, CX, OX
2. PURPOSE OF ENTRY:
SET CURRENT CLOCK (TIMER DATA AREA)
INPUT CONDITIONS:
REGISTERS MODIFIED:
AH OIH
CX = HIGH WORD OF COUNT
OX = LOW WORD OF COUNT
AH
3. PURPOSE OF ENTRY: READ TIME OF REAL TIME CLOCK
4.
2-154 ROM BIOS.
INPUT CONDITIONS: AH = 02H
NORMAL EXIT CONDITIONS: CH HOURS IN BCD
CL MINUTES IN BCD
DH SECONDS IN BCD
DL 00 - NOT DAYLIGHT SAVINGS
01 - DAYLIGHT SAVINGS
ERROR EXIT CONDITIONS: CF FLAG SET IF CLK NOT OPERATING
REGISTERS MODIFIED: AX, CX, OX
PURPOSE OF ENTRY:
INPUT CONDITIONS:
RESTRICTIONS:
REGISTERS MODIFIED:
SET TIME OF REAL TIME CLOCK
AH 03H
CH HOURS IN BCD
CL MINUTES IN BCD
DH SECONDS IN BCD
DL I IF DAYLIGHT SAVINGS OPTION.
ELSE O.
DL SHOULD = I OR = 0 ONLY.
DL MADE TO = ITS OWN BITO.
AX