2019-11-07 22:05:53 +00:00
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;====================================
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; generate 4 patterns worth of music
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; at address $D000-$FC00
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pt3_write_lc_4:
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; page offset
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lda #0
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sta FRAME_PAGE
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lc4_frame_decode_loop:
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jsr pt3_set_pages
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jsr pt3_write_lc
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lda FRAME_PAGE
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cmp #4
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bne lc4_frame_decode_loop
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rts
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;==============================
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; write one page of frame data
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pt3_write_lc_1:
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; page offset
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lda #0
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sta FRAME_PAGE
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jsr pt3_set_pages
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jsr pt3_write_lc
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rts
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;==============================
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; write one page of frame data
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pt3_write_lc:
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; offset within page
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lda #0
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sta FRAME_OFFSET
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lc_frame_decode_loop:
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jsr pt3_make_frame
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jsr pt3_write_frame
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inc FRAME_OFFSET
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lda FRAME_OFFSET
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cmp #59*3 ; FIXME: make this depend on song
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; hardcoding for 59 for our song
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bne lc_frame_decode_loop
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inc FRAME_PAGE
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rts
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2019-11-08 05:47:34 +00:00
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;========================
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;
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2019-11-07 22:05:53 +00:00
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pt3_set_pages:
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lda FRAME_PAGE
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asl
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asl
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asl
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asl
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tay
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lda music_addr_table+0,Y
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sta r0_wrsmc+2
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lda music_addr_table+1,Y
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sta r1_wrsmc+2
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lda music_addr_table+2,Y
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sta r2_wrsmc+2
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lda music_addr_table+3,Y
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sta r4_wrsmc+2
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2019-11-08 18:22:02 +00:00
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lda music_addr_table+4,Y ;5+13=D4
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2019-11-07 22:05:53 +00:00
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sta r13_wrsmc+2
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lda music_addr_table+5,Y
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sta r6_wrsmc+2
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lda music_addr_table+6,Y
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sta r7_wrsmc+2
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lda music_addr_table+7,Y
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sta r8_wrsmc+2
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lda music_addr_table+8,Y
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sta r9_wrsmc+2
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lda music_addr_table+9,Y
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sta r11_wrsmc+2
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lda music_addr_table+10,Y
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sta r12_wrsmc+2
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rts
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2019-11-08 06:18:02 +00:00
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.align $100
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2019-11-07 22:05:53 +00:00
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music_table_begin:
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music_addr_table:
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.byte $f1,$f2,$f3,$f4,$f5,$f6,$f7,$f8,$f9,$fa,$fb,$BB,$CC,$DD,$EE,$FF
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.byte $e6,$e7,$e8,$e9,$ea,$eb,$ec,$ed,$ee,$ef,$f0,$BB,$CC,$DD,$EE,$FF
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.byte $db,$dc,$dd,$de,$df,$e0,$e1,$e2,$e3,$e4,$e5,$BB,$CC,$DD,$EE,$FF
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.byte $d0,$d1,$d2,$d3,$d4,$d5,$d6,$d7,$d8,$d9,$da,$BB,$CC,$DD,$EE,$FF
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2019-11-08 06:18:02 +00:00
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.byte $d0,$d1,$d2,$d3,$d4,$d5,$d6,$d7,$d8,$d9,$da,$BB,$CC,$DD,$EE,$FF
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2019-11-07 22:05:53 +00:00
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music_table_end:
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.assert >music_table_begin = >music_table_end, error, "music_table crosses page"
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