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demo: shave a few more bytes
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@ -40,7 +40,7 @@ ESCAPE: escape.o
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ld65 -o ESCAPE escape.o -C $(LINKER_SCRIPTS)/apple2_c00.inc
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escape.o: escape.s \
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logo_intro.s \
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logo_intro.s zp.inc \
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ay3_write_regs.s escape.s interrupt_handler.s \
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play_frame.s \
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mA2E_4.s mockingboard_constants.s mockingboard_init.s tracker_init.s
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@ -13,9 +13,9 @@ set_notes_loop:
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;==================
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; load next byte
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ldy SONG_OFFSET ; Y = offset into song
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; ldy SONG_OFFSET ; Y = offset into song
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track_smc:
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lda track4,Y ; get next byte into A
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lda track4;,Y ; get next byte into A
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;==================
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; see if hit end
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@ -45,10 +45,10 @@ no_wrap:
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; lda bamps_h,Y ; enforce in same page
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; sta bamp_smc+2
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lda #0 ; reset song offset
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sta SONG_OFFSET
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; lda #0 ; reset song offset
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; sta SONG_OFFSET
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beq set_notes_loop ; bra ; try again in new track
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jmp set_notes_loop ; bra ; try again in new track
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not_end:
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@ -78,24 +78,18 @@ not_end:
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tay ; lookup in table
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lda frequencies_high,Y
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sta AY_REGS+1,X
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; sta $500,X
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lda frequencies_high,Y ; get high frequency
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sta AY_REGS+1,X ; put in AY register
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lda frequencies_low,Y
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sta AY_REGS,X ; set proper register value
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; visualization
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;blah_urgh:
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; sta $400,Y
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; inc blah_urgh+1
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lda frequencies_low,Y ; get low frequency
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sta AY_REGS,X ; also put in AY register
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;============================
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; point to next
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; assume less than 256 bytes
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inc SONG_OFFSET
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inc track_smc+1 ; SONG_OFFSET
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done_update_song:
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@ -104,7 +98,9 @@ done_update_song:
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;=================================
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; coundown song
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dec SONG_COUNTDOWN
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dec SONG_COUNTDOWN ; if length was 0, means there
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; was another note starting at same
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; time, so go back and play that too
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bmi set_notes_loop
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@ -135,28 +131,28 @@ chanb:
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tya
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bne bamps_skip
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lda BAMP_COUNTDOWN
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lda BAMP_COUNTDOWN ; b-amp conutdown
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bne bamps_good
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bamp_smc:
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lda bamps4
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lda bamps4 ; get new value
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pha
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and #$f
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and #$f ; bottom 4 its is ampllitude
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sta AY_REGS+9 ; B volume
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pla
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lsr ; top 4 bits are length
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lsr
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lsr
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lsr
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lsr
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; clc
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; adc #1
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sta BAMP_COUNTDOWN
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inc bamp_smc+1
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inc bamp_smc+1 ; increment to next location
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; assumes on same page
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; and less than 256
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bamps_good:
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dec BAMP_COUNTDOWN
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dec BAMP_COUNTDOWN ; countdown
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bamps_skip:
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;=================================
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@ -13,7 +13,7 @@ AY_REGS = $70
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SONG_L = $80
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SONG_H = $81
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SONG_OFFSET = $82
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;SONG_OFFSET = $82
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SONG_COUNTDOWN = $83
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OCTAVE = $84
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REGISTER = $85
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