A2osX/ProDOS.203/ProDOS.S.TCLK.txt

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NEW
AUTO 3,1
* object code = tclock_0
* Thunderclock driver
* hard coded for slot 1
* $2F00-2F7C moved to $D742
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TCLK.START ldx TCLK.Cx2+2 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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TCLK.Cx1 jsr wttcp
TCLK.Cx2 jsr rdtcp read month, day of week, day of month
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clc and time into input buffer.
ldx #$04 index for 5 values.
ldy #$0C read minutes 1st, month last.
.1 lda inbuf,y convert values to binary.
and #$07 no value > 5 decimal.
sta pcl 'tens' place value
asl multiply by 10
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asl
adc pcl
asl
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adc inbuf+1,y add to ascii 'ones' place
sec and subtract out the ascii
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sbc #$B0
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sta pcl,x save converted value.
dey index to next lowest value
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dey
dey
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dex are there more values?
bpl .1 if yes.
tay contains month
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lsr
ror
ror
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ror 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.
adc tdays-1,y (y = month)
bcc .2 branch if not Sept 13 thru 30th
adc #$03 adj for mod 7 when day > 256
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.2 sec
.3 sbc #$07
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bcs .3 loop until < 0.
adc #$07 make it in the range of 0-6.
sbc pch the delta provides years offset.
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bcs .4 branch if positive
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adc #$07 else make it positive again.
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.4 tay
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lda yradj,y look up year
plp and combine it with hi bit of month
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rol
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sta p8date+1 P8 date
lda A1L+1 hour
sta p8time+1 P8 time
lda A2L minute
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sta p8time
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pla restore previous mode.
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ldx TCLK.Cx2+2 clock slot = $C1
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sta clkmode,x
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TCLK.CEND rts
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* this table contains entries for the cumulative # of days in a year,
* one entry for each month. the values are modulo 256.
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tdays .DA #$00 January
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.DA #$1F February
.DA #$3B March
.DA #$5A April
.DA #$78 May
.DA #$97 June
.DA #$B5 July
.DA #$D3 August
.DA #$F2 September
.DA #$14 October (MOD 256)
.DA #$33 November
.DA #$51 December
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* the following table is used to look up the current year, based on
* the current month, day and day of week. The 1st entry corresponds
* to the year in which January 1st falls on a Monday. The 2nd entry
* is the year which January 1st is Sunday, and so on backwards thru
* the days of the week.
yradj .DA #$18 Monday
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.DA #$17 Sunday
.DA #$16 Saturday
.DA #$1B Friday
.DA #$1A Thursday
.DA #$19 Wednesday
.DA #$18 Tuesday
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TCLK.END .HS 000000 pad
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*--------------------------------------
MAN
SAVE usr/src/prodos.203/prodos.s.tclk
LOAD usr/src/prodos.203/prodos.s
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ASM