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https://github.com/deater/dos33fsprogs.git
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pt3: add support for scaling the frequencies from 1.77MHz to 1MHz
The ZX Spectrum (default for pt3 files) runs the AY-3-8910 at 1.77MHz. We do this by multiplying by 9/16 (which is a pain, but could be worse)
This commit is contained in:
Vince Weaver
parent
45f367f356
commit
0a84e76e4e
@ -47,20 +47,27 @@ Using the PT3_PLAYER
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The pt3_player.dsk should boot automatically.
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Use the right/left arrow keys to switch songs.
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Press the space bar to pause playback.
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Controls:
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Right/Left arrow Switch songs
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Spacebar Pause playback.
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M Switch from 1MHz to 1.77MHz mode
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FUTURE FEATURES:
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Key to disable visualization
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Key to skip ahead/back in pattern list
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L to enable looping in the song
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Known Bugs:
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~~~~~~~~~~~
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Will try to display lowecase names on a II/II+
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ZX Compatability:
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~~~~~~~~~~~~~~~~~
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ZX Spectrum songs expect a 1.77MHz AY-3-8910, but
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the Apple II is 1MHz so song are higher(?) pitched
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ZX Spectrum songs expect a 1.77MHz AY-3-8910, but the Apple II
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is 1MHz so by default songs would sound lower
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pitched. By default now we multiply by 9/16 to scale
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things properly, but that does eat up extra CPU cycles.
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You can toggle this on/off by pressing "M" when playing.
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In theory we can create songs that expect 1MHz, but the pt3 format
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has no way of indicating this.
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Adding other files
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~~~~~~~~~~~~~~~~~~
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@ -189,7 +189,7 @@ check_keyboard:
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beq exit_interrupt
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cmp #(' '+$80)
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bne key_R
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bne key_M
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key_space:
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lda #$80
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eor DONE_PLAYING
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@ -207,13 +207,26 @@ lowbar:
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jmp quiet_exit
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key_R:
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cmp #'R'
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key_M:
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cmp #'M'
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bne key_left
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lda #$ff
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eor RASTERBARS_ON
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sta RASTERBARS_ON
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lda convert_177
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eor #$1
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sta convert_177
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beq at_1MHz
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lda #'7'+$80
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sta $7F4
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sta $BF4
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jmp done_key
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at_1MHz:
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lda #'0'+$80
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sta $7F4
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sta $BF4
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jmp done_key
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key_left:
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@ -1803,16 +1803,128 @@ do_frame:
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lda note_a+NOTE_TONE_H ; Note A Period H
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sta REGISTER_DUMP+1 ; into R1
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lda convert_177
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beq no_scale_a
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; Convert from 1.77MHz to 1MHz by multiplying by 9/16
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; first multiply by 8
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asl REGISTER_DUMP+0
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rol REGISTER_DUMP+1
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asl REGISTER_DUMP+0
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rol REGISTER_DUMP+1
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asl REGISTER_DUMP+0
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rol REGISTER_DUMP+1
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; add in original to get 9
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clc
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lda note_a+NOTE_TONE_L
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adc REGISTER_DUMP+0
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sta REGISTER_DUMP+0
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lda note_a+NOTE_TONE_H
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adc REGISTER_DUMP+1
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sta REGISTER_DUMP+1
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; divide by 16 to get proper value
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ror REGISTER_DUMP+1
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ror REGISTER_DUMP+0
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ror REGISTER_DUMP+1
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ror REGISTER_DUMP+0
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ror REGISTER_DUMP+1
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ror REGISTER_DUMP+0
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ror REGISTER_DUMP+1
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ror REGISTER_DUMP+0
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lda REGISTER_DUMP+1
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and #$0f
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sta REGISTER_DUMP+1
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no_scale_a:
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lda note_b+NOTE_TONE_L ; Note B Period L
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sta REGISTER_DUMP+2 ; into R2
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lda note_b+NOTE_TONE_H ; Note B Period H
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sta REGISTER_DUMP+3 ; into R3
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lda convert_177
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beq no_scale_b
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; Convert from 1.77MHz to 1MHz by multiplying by 9/16
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; first multiply by 8
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asl REGISTER_DUMP+2
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rol REGISTER_DUMP+3
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asl REGISTER_DUMP+2
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rol REGISTER_DUMP+3
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asl REGISTER_DUMP+2
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rol REGISTER_DUMP+3
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; add in original to get 9
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clc
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lda note_b+NOTE_TONE_L
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adc REGISTER_DUMP+2
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sta REGISTER_DUMP+2
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lda note_b+NOTE_TONE_H
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adc REGISTER_DUMP+3
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sta REGISTER_DUMP+3
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; divide by 16 to get proper value
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ror REGISTER_DUMP+3
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ror REGISTER_DUMP+2
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ror REGISTER_DUMP+3
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ror REGISTER_DUMP+2
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ror REGISTER_DUMP+3
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ror REGISTER_DUMP+2
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ror REGISTER_DUMP+3
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ror REGISTER_DUMP+2
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lda REGISTER_DUMP+3
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and #$0f
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sta REGISTER_DUMP+3
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no_scale_b:
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lda note_c+NOTE_TONE_L ; Note C Period L
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sta REGISTER_DUMP+4 ; into R4
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lda note_c+NOTE_TONE_H ; Note C Period H
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sta REGISTER_DUMP+5 ; into R5
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lda convert_177
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beq no_scale_c
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; Convert from 1.77MHz to 1MHz by multiplying by 9/16
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; first multiply by 8
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asl REGISTER_DUMP+4
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rol REGISTER_DUMP+5
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asl REGISTER_DUMP+4
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rol REGISTER_DUMP+5
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asl REGISTER_DUMP+4
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rol REGISTER_DUMP+5
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; add in original to get 9
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clc
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lda note_c+NOTE_TONE_L
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adc REGISTER_DUMP+4
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sta REGISTER_DUMP+4
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lda note_c+NOTE_TONE_H
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adc REGISTER_DUMP+5
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sta REGISTER_DUMP+5
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; divide by 16 to get proper value
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ror REGISTER_DUMP+5
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ror REGISTER_DUMP+4
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ror REGISTER_DUMP+5
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ror REGISTER_DUMP+4
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ror REGISTER_DUMP+5
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ror REGISTER_DUMP+4
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ror REGISTER_DUMP+5
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ror REGISTER_DUMP+4
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lda REGISTER_DUMP+5
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and #$0f
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sta REGISTER_DUMP+5
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no_scale_c:
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; Noise
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; frame[6]= (pt3->noise_period+pt3->noise_add)&0x1f;
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clc
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@ -1820,6 +1932,34 @@ do_frame:
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adc pt3_noise_add
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and #$1f
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sta REGISTER_DUMP+6
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sta temp_word_l
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lda convert_177
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beq no_scale_n
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; Convert from 1.77MHz to 1MHz by multiplying by 9/16
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; first multiply by 8
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asl REGISTER_DUMP+6
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asl REGISTER_DUMP+6
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asl REGISTER_DUMP+6
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; add in original to get 9
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clc
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lda temp_word_l
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adc REGISTER_DUMP+6
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; divide by 16 to get proper value
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ror REGISTER_DUMP+6
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ror REGISTER_DUMP+6
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ror REGISTER_DUMP+6
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ror REGISTER_DUMP+6
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lda REGISTER_DUMP+6
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and #$1f
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sta REGISTER_DUMP+6
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no_scale_n:
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; Mixer
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@ -1847,13 +1987,51 @@ do_frame:
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clc
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lda pt3_envelope_slide_l
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adc temp_word_l
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; sta temp_word_l
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sta temp_word_l
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sta REGISTER_DUMP+11
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lda temp_word_h
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adc pt3_envelope_slide_h
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; sta temp_word_h
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sta temp_word_h
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sta REGISTER_DUMP+12
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lda convert_177
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beq no_scale_e
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; Convert from 1.77MHz to 1MHz by multiplying by 9/16
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; first multiply by 8
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asl REGISTER_DUMP+11
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rol REGISTER_DUMP+12
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asl REGISTER_DUMP+11
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rol REGISTER_DUMP+12
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asl REGISTER_DUMP+11
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rol REGISTER_DUMP+12
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; add in original to get 9
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clc
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lda temp_word_l
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adc REGISTER_DUMP+11
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sta REGISTER_DUMP+11
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lda temp_word_h
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adc REGISTER_DUMP+12
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sta REGISTER_DUMP+12
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; divide by 16 to get proper value
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ror REGISTER_DUMP+12
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ror REGISTER_DUMP+11
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ror REGISTER_DUMP+12
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ror REGISTER_DUMP+11
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ror REGISTER_DUMP+12
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ror REGISTER_DUMP+11
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ror REGISTER_DUMP+12
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ror REGISTER_DUMP+11
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lda REGISTER_DUMP+12
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and #$0f
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sta REGISTER_DUMP+12
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no_scale_e:
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; Envelope shape
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lda pt3_envelope_type
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cmp pt3_envelope_type_old
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@ -334,6 +334,20 @@ done_name_loop:
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sta CH
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jsr print_both_pages ; print, tail call
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; update the MHz indicator with current state
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lda convert_177
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beq set_1MHz
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lda #'7'+$80
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jmp done_MHz
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set_1MHz:
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lda #'0'+$80
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done_MHz:
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sta $7F4
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sta $BF4
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; Print Left Arrow (INVERSE)
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lda #'<'
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sta $6D0
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@ -592,5 +606,5 @@ found_message: .asciiz "FOUND"
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;done_message: .asciiz "DONE PLAYING"
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loading_message: .asciiz "LOADING"
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clock_string: .asciiz "0:00 / 0:00"
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mhz_string: .asciiz "1.0MHZ"
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mhz_string: .asciiz "1.7MHZ"
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