1 line
13 KiB
NASM
Executable File
1 line
13 KiB
NASM
Executable File
keep obj/time
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mcopy time.macros
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case on
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****************************************************************
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*
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* Time - Time and date libraries for C
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*
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* This code implements the tables and subroutines needed to
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* support the standard C library TIME.
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*
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* January 1989
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* Mike Westerfield
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*
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* Copyright 1989
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* Byte Works, Inc.
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*
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* Note: Portions of this library appear in SysFloat
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*
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****************************************************************
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*
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Time start dummy segment
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end
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****************************************************************
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*
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* TimeCommon - common variables for the time library
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*
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****************************************************************
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*
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TimeCommon privdata
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;
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; For conversion to/from seconds since 1970
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;
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year ds 4 year 0..99
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month ds 4 month 1..12
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day ds 4 day 1..31
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hour ds 4 hour 0..23
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minute ds 4 minute 0..59
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second ds 4 second 0..59
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count ds 4 seconds since 1 Jan 1970
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t1 ds 4 work variable
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t2 ds 4 work variable
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end
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****************************************************************
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*
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* char *asctime(struct tm *ts)
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*
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* Inputs:
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* ts - time record to create string for
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*
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* Outputs:
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* returns a pointer to the time string
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*
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****************************************************************
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*
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asctime start
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csubroutine (4:ts),0
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phb
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phk
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plb
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brl ~ctime2
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end
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****************************************************************
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*
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* clock_t clock()
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*
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* Outputs:
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* X-A - tick count
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*
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****************************************************************
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*
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clock start
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pha
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pha
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_GetTick
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pla
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plx
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rtl
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end
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****************************************************************
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*
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* char *ctime(timeptr)
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* time_t *timptr;
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*
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* Inputs:
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* timeptr - time to create string for
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*
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* Outputs:
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* returns a pointer to the time string
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*
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****************************************************************
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*
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ctime start
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tm_sec equ 0 displacements into the time record
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tm_min equ 2
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tm_hour equ 4
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tm_mday equ 6
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tm_mon equ 8
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tm_year equ 10
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tm_wday equ 12
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csubroutine (4:timeptr),0
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phb
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phk
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plb
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ph4 timeptr convert to a time record
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jsl localtime
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sta timeptr
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stx timeptr+2
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~ctime2 entry
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ldy #tm_wday convert the week day to a string
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lda [timeptr],Y
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asl a
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asl a
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tax
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lda weekDay,X
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sta str
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lda weekDay+1,X
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sta str+1
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ldy #tm_mon convert the month to a string
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lda [timeptr],Y
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asl a
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asl a
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tax
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lda monthStr,X
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sta str+4
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lda monthStr+1,X
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sta str+5
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ldy #tm_mday convert the day to a string
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lda [timeptr],Y
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jsr mkstr
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sta str+8
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ldy #tm_hour convert the hour to a string
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lda [timeptr],Y
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jsr mkstr
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sta str+11
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ldy #tm_min convert minutes to a string
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lda [timeptr],Y
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jsr mkstr
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sta str+14
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ldy #tm_sec convert seconds to a string
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lda [timeptr],Y
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jsr mkstr
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sta str+17
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ldy #tm_year convert the year to a string
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lda #'91'
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sta str+20
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lda [timeptr],Y
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cmp #100
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blt lb1
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ldx #'02'
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stx str+20
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sec
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sbc #100
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lb1 jsr mkstr
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sta str+22
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lla timeptr,str
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plb
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creturn 4:timeptr
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weekDay dc c'Sun Mon Tue Wed Thu Fri Sat'
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monthStr dc c'Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec'
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str dc c'Sun Jan 00 00:00:00 1900',i1'10,0'
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;
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; mkstr - convert a number to a string
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;
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mkstr ldx #-1
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mk1 inx
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sec
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sbc #10
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bcs mk1
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clc
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adc #10
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xba
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pha
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txa
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ora 1,S
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ora #$3030
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plx
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rts
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end
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****************************************************************
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*
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* factor - compute the seconds since 1 Jan 1970 from date
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*
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* Inputs:
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* year,month,day,hour,minute,second - time to convert
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*
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* Outputs:
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* count - seconds since 1 Jan 1970
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*
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****************************************************************
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*
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factor private
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using TimeCommon
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;
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; compute the # of days since 1 Jan 1970
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;
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mul4 year,#365,count count := 365*year + day + 31*(month-1)
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add4 count,day
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mul4 month,#31,t1
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add4 count,t1
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sub4 count,#31
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move4 year,t2 t2 := year
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lda month if January or February then
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cmp #3
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bge lb1
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dec t2 year := year-1
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bra lb2 else
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lb1 mul4 month,#4,t1 count := count - (month*4+23) div 10
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add4 t1,#23
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div4 t1,#10
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sub4 count,t1
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lb2 lda t2 count := count + year div 4
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lsr A
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lsr A
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clc
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adc count
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sta count
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bcc lb3
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inc count+2
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lb3 add4 t2,#300 count := count -
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div4 t2,#100 ((300+year) div 100+1)*3 div 4
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inc4 t2
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mul4 t2,#3
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div4 t2,#4
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sub4 count,t2
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sub4 count,#25516 subtract off days between 1 Jan 00 and
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! 1 Jan 70
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;
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; Convert to seconds and add in time of day in seconds
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;
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mul4 count,#24*60*60 convert to seconds
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mul4 hour,#3600,t1 add in hours*3600
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add4 count,t1
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mul4 minute,#60,t1 add in minutes*60
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add4 count,t1
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add4 count,second add in seconds
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rts
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end
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****************************************************************
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*
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* struct tm *localtime(t)
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* time_t *t;
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*
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* Inputs:
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* t - # seconds since 1 Jan 1970
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*
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* Outputs:
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* returns a pointer to a time record
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*
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****************************************************************
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*
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localtime start
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gmtime entry
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using TimeCommon
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csubroutine (4:t),0
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phb
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phk
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plb
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ldy #2 dereference the pointer
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lda [t],Y
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tax
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lda [t]
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sta t
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stx t+2
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lda #69 find the year
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sta year
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lda #1
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sta month
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sta day
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stz hour
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stz minute
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stz second
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lb1 inc year
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jsr factor
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lda count+2
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cmp t+2
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bne lb1a
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lda count
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cmp t
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lb1a ble lb1
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dec year
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lb2 inc month find the month
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jsr factor
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lda count+2
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cmp t+2
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bne lb2a
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lda count
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cmp t
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lb2a ble lb2
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dec month
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jsr factor recompute the factor
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lda year set the year
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sta tm_year
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lda month set the month
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dec A
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sta tm_mon
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sub4 t,count find the number of seconds
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move4 t,t1
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div4 t,#60
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mul4 t,#60,t2
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sub4 t1,t2
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lda t1
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sta tm_sec
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move4 t,t1 find the number of minutes
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div4 t,#60
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mul4 t,#60,t2
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sub4 t1,t2
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lda t1
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sta tm_min
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move4 t,t1 find the number of hours
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div4 t,#24
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mul4 t,#24,t2
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sub4 t1,t2
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lda t1
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sta tm_hour
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lda t set the day
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inc A
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sta tm_mday
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ph4 #tm_sec set the day of week/year
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jsl mktime
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pha determine if it's daylight savings
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ph2 #$5E
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_ReadBParam
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pla
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lsr A
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and #$0001
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eor #$0001
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sta tm_isdst
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lla t,tm_sec
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plb
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creturn 4:t
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tm_sec ds 2 seconds 0..59
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tm_min ds 2 minutes 0..59
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tm_hour ds 2 hours 0..23
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tm_mday ds 2 day 1..31
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tm_mon ds 2 month 0..11
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tm_year ds 2 year 70..200 (1900=0)
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tm_wday ds 2 day of week 0..6 (Sun = 0)
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tm_yday ds 2 day of year 0..365
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tm_isdst ds 2 daylight savings? 1 = yes, 0 = no
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end
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****************************************************************
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*
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* time_t mktime(tmptr)
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* struct tm *tmptr
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*
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* Inputs:
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* tmptr - poiner to a time record
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*
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* Outputs:
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* tmptr->wday - day of week
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* tmptr->yday - day of year
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* returns the ime in seconds since 1 Jan 1970
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*
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****************************************************************
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*
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mktime start
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using TimeCommon
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temp equ 1 temp variable
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temp2 equ 5 temp variable
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csubroutine (4:tmptr),8
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phb
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phk
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plb
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lla temp,-1 assume we can't do it
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ldy #10 error if year < 70
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lda [tmptr],Y
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sta year
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cmp #70
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jlt lb1
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dey set the other time parameters
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dey
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lda [tmptr],Y
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inc A
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sta month
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dey
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dey
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lda [tmptr],Y
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sta day
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dey
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dey
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lda [tmptr],Y
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sta hour
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dey
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dey
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lda [tmptr],Y
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sta minute
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lda [tmptr]
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sta second
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jsr factor compute seconds since 1970
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move4 count,temp save the value for later return
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lda #1 compute the days since the start of the
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sta month year
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sta day
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jsr factor
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sub4 temp,count,count
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div4 count,#60*60*24
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ldy #14 set the days
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lda count
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inc A
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sta [tmptr],Y
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div4 temp,#60*60*24,temp2 compute the day of week
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add4 temp2,#4
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mod4 temp2,#7
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lda temp2 set the day of week
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ldy #12
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sta [tmptr],Y
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lb1 plb
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creturn 4:temp
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end
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****************************************************************
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*
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* time_t time(tptr)
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* time_t *tptr;
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*
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* Outputs:
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* tptr - if non-null, the value it points to is set
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* time - returns the value
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*
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****************************************************************
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*
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time start
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using TimeCommon
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csubroutine (4:tptr),0
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phb
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phk
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plb
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;
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; get the current time
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;
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pha get the current time
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pha
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pha
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pha
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_ReadTimeHex
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lda 5,S set the day
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and #$00FF
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inc A
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sta day
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lda 5,S set the month
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and #$FF00
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xba
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inc A
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sta month
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lda 3,S set the year
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and #$FF00
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xba
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sta year
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lda 3,S set the hour
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and #$00FF
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sta hour
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lda 1,S set the minute
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xba
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and #$00FF
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sta minute
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pla set the second
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and #$00FF
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sta second
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pla clean up the stack
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pla
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pla
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jsr factor convert the seconds
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lda tptr if tptr <> nil then
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ora tptr+2
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beq lb1
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ldy #2 place the result there
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lda count
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sta [tptr]
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lda count+2
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sta [tptr],Y
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lb1 move4 count,tptr
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plb
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creturn 4:tptr
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end
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