A2osX/ProDOS.203/ProDOS.S.TCLK.txt
2019-09-16 08:06:02 +02:00

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NEW
AUTO 3,1
* object code = tclock_0
* Thunderclock driver
* hard coded for slot 1
* $2F00-2F7C moved to $D742
TCLK.START ldx TCLK.Cx2+2 clock slot = $C1.
lda clkmode,x save current mode
pha
lda #$A3 send numeric mode byte to Thunderclock
TCLK.Cx1 jsr wttcp
TCLK.Cx2 jsr rdtcp read month, day of week, day of month
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 #$07 no value > 5 decimal.
sta pcl 'tens' place value
asl multiply by 10
asl
adc pcl
asl
adc inbuf+1,y add to ascii 'ones' place
sec and subtract out the ascii
sbc #$B0
sta pcl,x save converted value.
dey index to next lowest value
dey
dey
dex are there more values?
bpl .1 if yes.
tay contains month
lsr
ror
ror
ror high bit of month held in carry
ora A1L
sta p8date save low value of date.
php save high bit of month.
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
.2 sec
.3 sbc #$07
bcs .3 loop until < 0.
adc #$07 make it in the range of 0-6.
sbc pch the delta provides years offset.
bcs .4 branch if positive
adc #$07 else make it positive again.
.4 tay
lda yradj,y look up year
plp and combine it with hi bit of month
rol
sta p8date+1 P8 date
lda A1L+1 hour
sta p8time+1 P8 time
lda A2L minute
sta p8time
pla restore previous mode.
ldx TCLK.Cx2+2 clock slot = $C1
sta clkmode,x
TCLK.CEND rts
* this table contains entries for the cumulative # of days in a year,
* one entry for each month. the values are modulo 256.
tdays .DA #$00 January
.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
* 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 #$07 Monday
.DA #$0C Sunday
.DA #$0B Saturday
.DA #$0A Friday
.DA #$09 Thursday
.DA #$08 Wednesday
.DA #$08 Tuesday
TCLK.END .HS 000000 pad
*--------------------------------------
MAN
SAVE USR/SRC/PRODOS.203/PRODOS.S.TCLK
LOAD USR/SRC/PRODOS.203/PRODOS.S
ASM