dos33fsprogs/games/duke/speaker_tone.s

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2020-12-16 18:31:23 +00:00
; based on code from here
; http://eightbitsoundandfury.ld8.org/programming.html
; A,X,Y trashed
; duration also trashed
NOTE_C3 = 255
NOTE_CSHARP3 = 241
NOTE_D3 = 227
NOTE_DSHARP3 = 214
NOTE_E3 = 202
NOTE_F3 = 191
NOTE_FSHARP3 = 180
NOTE_G3 = 170
NOTE_GSHARP3 = 161
NOTE_A3 = 152
NOTE_ASHARP3 = 143
NOTE_B3 = 135
NOTE_C4 = 128
NOTE_CSHARP4 = 121
NOTE_D4 = 114
NOTE_DSHARP4 = 108
NOTE_E4 = 102
NOTE_F4 = 96
NOTE_FSHARP4 = 91
NOTE_G4 = 85
NOTE_GSHARP4 = 81
NOTE_A4 = 76
NOTE_ASHARP4 = 72
NOTE_B4 = 68
NOTE_C5 = 64
NOTE_CSHARP5 = 60
NOTE_D5 = 57
NOTE_DSHARP5 = 54
NOTE_E5 = 51
NOTE_F5 = 48
NOTE_FSHARP5 = 45
NOTE_G5 = 43
NOTE_GSHARP5 = 40
NOTE_A5 = 38
NOTE_ASHARP5 = 36
NOTE_B5 = 34
speaker_tone:
lda $C030 ; click speaker
speaker_loop:
dey ; y never set?
bne slabel1 ; duration roughly 256*?
dec speaker_duration ; (Duration)
beq done_tone
slabel1:
dex
bne speaker_loop
ldx speaker_frequency ; (Frequency)
jmp speaker_tone
done_tone:
rts
speaker_duration:
.byte $00
speaker_frequency:
.byte $00