2019-04-29 20:36:58 +00:00
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NEW
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AUTO 3,1
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* object code = tclock_0
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* Thunderclock driver
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* hard coded for slot 1
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* $2F00-2F7C moved to $D742
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ofsT .EQ tclock_0-tclk_in offset to Thunderclock org
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tclock_0 ldx clkslt clock slot = $C1.
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lda clkmode,x save current mode
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pha
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lda #$A3 send numeric mode byte to Thunderclock
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jsr wttcp
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clkslt .EQ *-ofsT+2 points to $C1.
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jsr rdtcp read month, day of week, day of month
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clc and time into input buffer.
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ldx #$04 index for 5 values.
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ldy #$0C read minutes 1st, month last.
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H2F14 lda inbuf,y convert values to binary.
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and #$07 no value > 5 decimal.
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sta pcl 'tens' place value
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asl a multiply by 10
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asl a
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adc pcl
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asl a
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adc inbuf+1,y add to ascii 'ones' place
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sec and subtract out the ascii
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sbc #$B0
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sta pcl,x save converted value.
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dey index to next lowest value
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dey
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dey
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dex are there more values?
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bpl H2F14 if yes.
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tay contains month
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lsr a
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ror a
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ror a
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ror a high bit of month held in carry
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ora A1L
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sta p8date save low value of date.
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php save high bit of month.
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and #$1F isolate day.
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adc tdays-1,y (y = month)
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bcc H2F42 branch if not Sept 13 thru 30th
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adc #$03 adj for mod 7 when day > 256
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H2F42 sec
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H2F43 sbc #$07
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bcs H2F43 loop until < 0.
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adc #$07 make it in the range of 0-6.
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sbc pch the delta provides years offset.
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bcs H2F4F branch if positive
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adc #$07 else make it positive again.
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H2F4F tay
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lda yradj,y look up year
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plp and combine it with hi bit of month
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rol a
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sta p8date+1 P8 date
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lda A1L+1 hour
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sta p8time+1 P8 time
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lda A2L minute
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sta p8time
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pla restore previous mode.
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ldx clkslt clock slot = $C1
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sta clkmode,x
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H2F69 rts
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* this table contains entries for the cumulative # of days in a year,
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* one entry for each month. the values are modulo 256.
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tdays .EQ *-ofsT
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2019-05-07 11:18:47 +00:00
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.DA #00' January
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2019-04-29 20:36:58 +00:00
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dc h'1F' February
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dc h'3B' March
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dc h'5A' April
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dc h'78' May
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dc h'97' June
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dc h'B5' July
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dc h'D3' August
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2019-05-07 11:18:47 +00:00
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.DA #F2' September
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2019-04-29 20:36:58 +00:00
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dc h'14' October (MOD 256)
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dc h'33' November
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dc h'51' December
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* the following table is used to look up the current year, based on
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* the current month, day and day of week. The 1st entry corresponds
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* to the year in which January 1st falls on a Monday. The 2nd entry
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* is the year which January 1st is Sunday, and so on backwards thru
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* the days of the week.
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yradj .EQ *-ofsT
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dc h'60' Monday
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dc h'5F' Sunday
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dc h'5E' Saturday
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dc h'5D' Friday
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2019-05-07 11:18:47 +00:00
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.DA #62' Thursday
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2019-04-29 20:36:58 +00:00
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dc h'61' Wednesday
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dc h'60' Tuesday
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tclk_end .EQ * end of obj tclock_0.
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dc h'000000' pad
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*--------------------------------------
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MAN
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2019-05-07 11:18:47 +00:00
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LOAD USR/SRC/PRODOS.203/PRODOS.S.TCLK
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SAVE USR/SRC/PRODOS.203/PRODOS.S
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2019-04-29 20:36:58 +00:00
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ASM
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