/
psg.asm
2426 lines (1859 loc) · 73.5 KB
/
psg.asm
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
; --------------------------------------------------------------------
; BrMSX v:1.32
; Copyright (C) 1997 by Ricardo Bittencourt
; module: PSG.ASM
; --------------------------------------------------------------------
.386p
code32 segment para public use32
assume cs:code32, ds:code32
include z80.inc
include bit.inc
include gui.inc
include pmode.inc
include pentium.inc
extrn dmabuffer: dword
extrn dmatemp: dword
extrn timebuffer: dword
extrn soundbuffer: dword
extrn sccram: dword
extrn noise_uncompressed: dword
public init_sound_blaster
public sound_on
public sound_off
public compose_soundstream
public soundenabled
public sbbaseaddr
public sbirq
public sbdma
public sounddetected
public read_master_volume
public write_master_volume
public compose_speaker
public speaker_shutup
;public noise_table
public sb_flushed
public noise_counter
public init_adlib
public reset_adlib
public fm_single_register
public soundplaying
public _samplerate
public _skipfactor
public _verticalrate
public uncompress_noise
public rom9dac_enabled
; DATA ---------------------------------------------------------------
align 4
;include noise.inc
include noise2.inc
include scc.inc
include envelope.inc
include fm.inc
include fmoper.inc
include fminstr.inc
align 4
SAMPLERATE equ 45455
_samplerate dd 45455
VERTICALRATE equ 60
_verticalrate dd 60
SKIPFACTOR equ 4
_skipfactor dd 4
DSP_TIME_CTE equ (256-(1000000/SAMPLERATE))
_dsp_time_cte dd DSP_TIME_CTE
MSXCLOCK equ (2*1788055)
;CONV_FACTOR equ (MSXCLOCK/16/SAMPLERATE*65536)
CONV_FACTOR equ 322247
;SINGLEINT equ SAMPLERATE/VERTICALRATE
SINGLEINT equ 757
BUFFERSIZE equ (SINGLEINT*SKIPFACTOR)
_buffersize dd 0
;CLOCKSPERSAMPLE equ (MSXCLOCK/SAMPLERATE*256)
CLOCKSPERSAMPLE equ 20140
;SCCFACTOR equ (32/32*MSXCLOCK/SAMPLERATE*65536)
SCCFACTOR equ 5155955
_sccfactor dd 0
;ENVELOPEFACTOR equ (MSXCLOCK/SAMPLERATE*65536*8)
ENVELOPEFACTOR equ 41247642
_envelopefactor dd 0
;FMFACTOR equ (256*MSXCLOCK/2^18/72/SAMPLERATE*65536*256)
FMFACTOR equ 17903
noisestream db 8192 dup (0) ;BUFFERSIZE dup (0)
envstream db 8192 dup (0) ;BUFFERSIZE dup (0)
doublebuffer db 8192 dup (0) ;BUFFERSIZE dup (0)
align 4
DSP_RESET dd 06h
DSP_READ_DATA dd 0Ah
DSP_WRITE_DATA dd 0Ch
DSP_WRITE_STATUS dd 0Ch
DSP_DATA_AVAIL dd 0Eh
DMA_page_table db 087h,083h,081h,082h
sounddetected dd 0
soundenabled dd 0
sbbaseaddr dd 0220h
sbirq dd 5
sbdma dd 1
sb_stub_buf db 21 dup (0)
oldsbpirqvect dd 0
oldsbrirqvect dd 0
irqskip dd 0
dmaready dd 0
sb_flushed dd 0
buffer_flushed dd 0
soundplaying dd 0
align 4
PSGcounter db 5*4 dup (0)
PSGstate db 5*4 dup (0)
actual_channel dd 0
localpos dd 0
noise_counter dd 0
noise_counter2 dd 0
danger_flag dd 0
envelope_enabled dd 0
envelope_first dd 1
SCCcounter db 5*4 dup (0)
sccsample dd 0
SCCpos db 5 dup (0)
align 4
FMcounter db 9*4 dup (0)
fmsample dd 0
FMpos db 9 dup (0)
align 4
ppiclick db 0
ppicassete db 0
rom9dac_value db 0
rom9dac_enabled db 0
psgregstack db 16 dup (0)
PSGreg db 16 dup (0)
sccregstack db 16 dup (0)
SCCregs db 16 dup (0)
fmregstack db 040h dup (0)
FMreg db 040h dup (0)
sb_default_pic1 db 0
sb_default_pic2 db 0
noisebit db 0
musicbit db 0
align 4
speakerchannel dd 0
speakerfreq dd 0
speakersilence dd 0
speakervolume db 0
db 0
db 0
db 0
align 4
localSCCram db 128 dup (0)
firstSCCram db 128 dup (0)
PSG_table dd offset PSG_full
dd offset PSG_only_noise
dd offset PSG_only_music
dd offset PSG_nothing
dd offset PSG_full_envelope
dd offset PSG_only_noise_envelope
dd offset PSG_only_music_envelope
dd offset PSG_nothing_envelope
; reset_dsp ----------------------------------------------------------
; reset the dsp
; return flag c if any error
reset_dsp:
mov edx,DSP_RESET
mov al,1
out dx,al
call delay10
mov edx,DSP_RESET
mov al,0
out dx,al
call delay10
mov edx,DSP_DATA_AVAIL
in al,dx
test al,BIT_7
jz reset_dsp_failed
mov edx,DSP_READ_DATA
in al,dx
cmp al,0AAh
jne reset_dsp_failed
or eax,eax
ret
reset_dsp_failed:
stc
ret
; delay10 ------------------------------------------------------------
; make a 10 ms delay
delay10:
mov v86r_ah,86h
mov v86r_cx,0
mov v86r_dx,10
mov al,15h
int 33h
ret
; init_sound_blaster -------------------------------------------------
; initialise the sb variables
init_sound_blaster:
mov eax,sbbaseaddr
add DSP_RESET,eax
add DSP_READ_DATA,eax
add DSP_WRITE_DATA,eax
add DSP_WRITE_STATUS,eax
add DSP_DATA_AVAIL,eax
call reset_dsp
; DSP_TIME_CTE equ (256-(1000000/SAMPLERATE))
mov eax,1000000
mov edx,0
mov ebx,_samplerate
div ebx
mov ebx,256
sub ebx,eax
mov _dsp_time_cte,ebx
; CONV_FACTOR equ (MSXCLOCK/16/SAMPLERATE*65536)
mov eax,06912E000h
mov edx,03h
mov ebx,_samplerate
div ebx
mov dword ptr [offset patch__11+2],eax
mov dword ptr [offset patch__12+2],eax
mov dword ptr [offset patch__13+2],eax
mov dword ptr [offset patch__14+2],eax
mov dword ptr [offset patch__15+2],eax
; SINGLEINT equ SAMPLERATE/VERTICALRATE
; BUFFERSIZE equ (SINGLEINT*SKIPFACTOR)
mov eax,_samplerate
mov ebx,_skipfactor
mul ebx
mov ebx,_verticalrate
div ebx
mov _buffersize,eax
mov dword ptr [offset patch__21+2],eax
mov dword ptr [offset patch__22+2],eax
mov dword ptr [offset patch__23+2],eax
mov dword ptr [offset patch__24+2],eax
mov dword ptr [offset patch__25+2],eax
mov dword ptr [offset patch__26+2],eax
mov dword ptr [offset patch__27+2],eax
mov dword ptr [offset patch__210+2],eax
mov dword ptr [offset patch__211+2],eax
mov dword ptr [offset patch__212+2],eax
mov dword ptr [offset patch__213+2],eax
mov dword ptr [offset patch__214+2],eax
mov dword ptr [offset patch__215+2],eax
mov dword ptr [offset patch__216+2],eax
mov dword ptr [offset patch__217+2],eax
mov dword ptr [offset patch__218+2],eax
mov dword ptr [offset patch__219+2],eax
mov dword ptr [offset patch__220+2],eax
mov dword ptr [offset patch__221+2],eax
mov dword ptr [offset patch__222+2],eax
mov dword ptr [offset patch__223+2],eax
; CLOCKSPERSAMPLE equ (MSXCLOCK/SAMPLERATE*256)
mov eax,036912E00h
mov edx,0
mov ebx,_samplerate
div ebx
mov dword ptr [offset patch__31+2],eax
mov dword ptr [offset patch__32+2],eax
mov dword ptr [offset patch__33+2],eax
mov dword ptr [offset patch__34+2],eax
mov dword ptr [offset patch__35+2],eax
mov dword ptr [offset patch__36+2],eax
mov dword ptr [offset patch__37+2],eax
mov dword ptr [offset patch__38+2],eax
mov dword ptr [offset patch__39+2],eax
mov dword ptr [offset patch__310+2],eax
mov dword ptr [offset patch__311+2],eax
mov dword ptr [offset patch__312+2],eax
mov dword ptr [offset patch__313+2],eax
mov dword ptr [offset patch__314+2],eax
mov dword ptr [offset patch__315+2],eax
mov dword ptr [offset patch__316+2],eax
mov dword ptr [offset patch__317+2],eax
mov dword ptr [offset patch__318+2],eax
; SCCFACTOR equ (32/32*MSXCLOCK/SAMPLERATE*65536)
mov eax,912E0000h
mov edx,036h
mov ebx,_samplerate
div ebx
mov _sccfactor,eax
; ENVELOPEFACTOR equ (MSXCLOCK/SAMPLERATE*65536*8)
mov eax,89700000h
mov edx,01B4h
mov ebx,_samplerate
div ebx
mov _envelopefactor,eax
ret
; uncompress_noise ---------------------------------------------------
; uncompress the noise and patch all references
uncompress_noise:
mov ecx,16384/8
mov esi,offset noise_table_z
mov edi,noise_uncompressed
uncompress_noise_loop:
mov bl,[esi]
irp i,<0,1,2,3,4,5,6,7>
rol bl,1
sbb al,al
mov [edi],al
inc edi
endm
inc esi
dec ecx
jnz uncompress_noise_loop
mov eax,noise_uncompressed
mov dword ptr [offset patch__41+2],eax
mov dword ptr [offset patch__42+2],eax
mov dword ptr [offset patch__43+2],eax
mov dword ptr [offset patch__44+2],eax
mov dword ptr [offset patch__45+2],eax
mov dword ptr [offset patch__46+2],eax
mov dword ptr [offset patch__47+2],eax
ret
; init_dma_buffer ----------------------------------------------------
; init the dma buffer
; this version uses a constant tone of about 60 Hz
init_dma_buffer:
mov edi,dmabuffer
mov ecx,_buffersize ;BUFFERSIZE
mov al,0
rep stosb
ret
; write_dsp ----------------------------------------------------------
; write a byte in the dsp
; in: bl=byte
write_dsp:
mov edx,DSP_WRITE_STATUS
write_dsp_loop:
in al,dx
test al,BIT_7
jnz write_dsp_loop
mov edx,DSP_WRITE_DATA
mov al,bl
out dx,al
ret
; play ---------------------------------------------------------------
; turn on the DSP and start DMA transfers to sound board
play:
mov eax,sbdma
or eax,BIT_2
mov dx,0Ah
out dx,al
mov al,0
mov dx,0Ch
out dx,al
mov eax,(048h or 010h)
or eax,sbdma
mov dx,0Bh
out dx,al
mov edi,dmabuffer
add edi,_code32a
mov eax,edi
mov edx,sbdma
shl edx,1
out dx,al
shr eax,8
out dx,al
shr eax,8
mov edx,sbdma
movzx edx,byte ptr [offset DMA_page_table+edx]
out dx,al
mov ebx,_buffersize
dec ebx
;mov al,((BUFFERSIZE-1) and 0FFh)
mov al,bl
mov edx,sbdma
shl edx,1
inc edx
out dx,al
;mov al,(((BUFFERSIZE-1) shr 8) and 0FFh)
mov al,bh
out dx,al
mov eax,sbdma
mov dx,0Ah
out dx,al
mov bl,040h
call write_dsp
mov ebx,_dsp_time_cte
call write_dsp
mov bl,048h
call write_dsp
mov ebx,_buffersize
dec ebx
;mov bl,((BUFFERSIZE-1) and 0FFh)
call write_dsp
mov ebx,_buffersize
dec ebx
mov bl,bh
;mov bl,(((BUFFERSIZE-1) shr 8) and 0FFh)
call write_dsp
mov bl,090h
call write_dsp
ret
; my_sb_irq_handler --------------------------------------------------
; sound blaster interrupt handler
my_sb_irq_handler:
cli
pushad
push ds
mov ds,cs:_seldata
mov sb_flushed,1
mov buffer_flushed,1
mov edi,dmabuffer
mov esi,offset doublebuffer ; dmatemp
;mov ecx,(BUFFERSIZE+4)/4
mov ecx,_buffersize
shr ecx,2
inc ecx
rep movsd
mov edx,DSP_DATA_AVAIL
in al,dx
mov al,20h
out 20h,al
mov al,20h
out 0A0h,al
pop ds
popad
sti
iretd
; turnon_sbirq -------------------------------------------------------
; turn on the sound blaster interrupt handler
turnon_sbirq:
mov ebx,sbirq
call _getirqvect
mov oldsbpirqvect,edx
mov edx,offset my_sb_irq_handler
call _setirqvect
mov edi,offset sb_stub_buf
call _rmpmirqset
mov oldsbrirqvect,eax
mov dx,021h
in al,dx
mov sb_default_pic1,al
mov dx,0A1h
in al,dx
mov sb_default_pic2,al
mov eax,1
mov ecx,sbirq
shl eax,cl
xor eax,0FFFFFFFFh
and al,sb_default_pic1
mov dx,021h
out dx,al
and ah,sb_default_pic2
mov dx,0A1h
mov al,ah
out dx,al
ret
; turnoff_sbirq ------------------------------------------------------
; turn off the sound blaster interrupt handler
turnoff_sbirq:
mov ebx,sbirq
mov eax,oldsbrirqvect
call _rmpmirqfree
mov edx,oldsbpirqvect
call _setirqvect
call reset_dsp
mov al,sb_default_pic1
mov dx,021h
out dx,al
mov al,sb_default_pic2
mov dx,0A1h
out dx,al
ret
; sound_on -----------------------------------------------------------
; turns on the sound system
sound_on:
or soundplaying,1
cmp soundenabled,0
je _ret
cmp emulatemode,1
je _ret
call init_dma_buffer
mov eax,SKIPFACTOR
mov irqskip,eax
call turnon_sbirq
call play
cmp fmenabled,1
jne _ret
call fm_slice
ret
; sound_off ----------------------------------------------------------
; turns off the sound system
sound_off:
and soundplaying,0FFFFFFFEh
cmp speaker,1
jne sound_off_sb
call speaker_shutup
ret
sound_off_sb:
cmp soundenabled,0
je _ret
call turnoff_sbirq
ret
; read_master_volume -------------------------------------------------
; read the value of the master volume from the sb pro mixer
; output: al= value read (low nibble)
read_master_volume:
push edx
mov edx,sbbaseaddr
add edx,4
; read the master volume
mov al,22h
out dx,al
inc dx
in al,dx
and al,0Fh
pop edx
ret
; write_master_volume ------------------------------------------------
; write a value to the master volume
; input: al= value write (low nibble)
write_master_volume:
push edx eax
mov edx,sbbaseaddr
add edx,4
mov ah,al
and ah,0Fh
; write the master volume
mov al,22h
out dx,al
inc dx
mov al,ah
shl ah,4
or al,ah
out dx,al
pop eax edx
ret
; compose_soundstream ------------------------------------------------
; compose the output sound stream
; based on PSG registers
compose_soundstream:
cmp soundenabled,0
je compose_soundstream_off
cmp turnoff_flag,1
je compose_purenoise
pushad
;call fm_slice
dec irqskip
jnz compose_soundstream_update_buffer
mov dmaready,1
mov irqskip,SKIPFACTOR
mov esi,timebuffer
mov ecx,psgpos
mov [esi+ecx*4],0FFFFFFFFh
mov localpos,0
mov actual_channel,3
call compose_noise
mov localpos,0
mov actual_channel,4
call compose_envelope
mov localpos,0
call compose_click
mov localpos,0
call compose_rom9dac
mov localpos,0
call compose_cassete
mov localpos,0
mov actual_channel,0
call compose_channel
mov localpos,0
mov actual_channel,1
call compose_channel
mov localpos,0
mov actual_channel,2
call compose_channel
cmp sccenabled,0
je compose_soundstream_noscc
cmp sccdetected,0
je compose_soundstream_noscc
mov localpos,0
mov actual_channel,0
mov esi,offset localSCCram
call compose_scc
mov localpos,0
mov actual_channel,1
mov esi,offset localSCCram
add esi,32
call compose_scc
mov localpos,0
mov actual_channel,2
mov esi,offset localSCCram
add esi,32*2
call compose_scc
mov localpos,0
mov actual_channel,3
mov esi,offset localSCCram
add esi,32*3
call compose_scc
mov localpos,0
mov actual_channel,4
mov esi,offset localSCCram
add esi,32*3
call compose_scc
compose_soundstream_noscc:
cmp fmenabled,1
jne compose_soundstream_nofm
; irp i,<0,1,2,3,4,5,6,7,8>
; mov localpos,0
; mov actual_channel,i
; mov esi,offset sine_table
; call compose_fm
; endm
compose_soundstream_nofm:
mov esi,offset psgreg
mov edi,offset psgregstack
mov ecx,16/4
rep movsd
mov esi,offset sccregs
mov edi,offset sccregstack
mov ecx,16/4
rep movsd
mov esi,offset localSCCram
mov edi,offset firstSCCram
mov ecx,128/4
rep movsd
mov esi,offset fmreg
mov edi,offset fmregstack
mov ecx,040h/4
rep movsd
mov psgclear,1
mov psgpos,0
compose_soundstream_exit:
popad
ret
compose_soundstream_off:
mov psgpos,0
ret
compose_soundstream_update_buffer:
cmp dmaready,1
jne compose_soundstream_exit
cmp buffer_flushed,1
jne compose_soundstream_exit
mov dmaready,0
mov buffer_flushed,0
mov esi,dmatemp
mov edi,offset doublebuffer
mov ecx,_buffersize ;BUFFERSIZE
rep movsb
popad
ret
; compose_click ------------------------------------------------------
; compose and mix the keyboard click
compose_click:
mov ecx,0
mov edi,_buffersize ; BUFFERSIZE
mov esi,dmatemp
mov ebp,timebuffer
mov ebp,[ebp]
shl ebp,8
mov al,ppiclick
compose_click_loop:
mov [esi],al
patch__31: add ecx,CLOCKSPERSAMPLE
inc esi
cmp ecx,ebp
jae compose_click_check
compose_click_nextsample:
dec edi
jnz compose_click_loop
ret
compose_click_check:
mov ebp,localpos
add ebp,ebp
add ebp,soundbuffer
mov al,byte ptr [ebp]
mov dl,byte ptr [ebp+1]
cmp al,16
jne compose_channel_notclick
mov ppiclick,dl
compose_channel_notclick:
inc localpos
mov ebp,localpos
shl ebp,2
add ebp,timebuffer
mov ebp,dword ptr [ebp]
shl ebp,8
mov al,ppiclick
jmp compose_click_nextsample
; compose_rom9dac ----------------------------------------------------
; compose and mix the 8-bit DAC used in mapper #9
compose_rom9dac:
cmp rom9dac_enabled,1
jne _ret
mov ecx,0
mov edi,_buffersize ; BUFFERSIZE
mov esi,dmatemp
mov ebp,timebuffer
mov ebp,[ebp]
shl ebp,8
mov al,rom9dac_value
compose_rom9dac_loop:
add [esi],al
patch__318: add ecx,CLOCKSPERSAMPLE
inc esi
cmp ecx,ebp
jae compose_rom9dac_check
compose_rom9dac_nextsample:
dec edi
jnz compose_rom9dac_loop
ret
compose_rom9dac_check:
mov ebp,localpos
add ebp,ebp
add ebp,soundbuffer
mov al,byte ptr [ebp]
mov dl,byte ptr [ebp+1]
cmp al,18
jne compose_rom9dac_notclick
mov rom9dac_value,dl
compose_rom9dac_notclick:
inc localpos
mov ebp,localpos
shl ebp,2
add ebp,timebuffer
mov ebp,dword ptr [ebp]
shl ebp,8
mov al,rom9dac_value
jmp compose_rom9dac_nextsample
; compose_cassete ----------------------------------------------------
; compose and mix the cassete output
compose_cassete:
mov ecx,0
mov edi,_buffersize ;BUFFERSIZE
mov esi,dmatemp
mov ebp,timebuffer
mov ebp,[ebp]
shl ebp,8
mov al,ppicassete
compose_cassete_loop:
add [esi],al
inc esi
patch__32: add ecx,CLOCKSPERSAMPLE
cmp ecx,ebp
jb compose_cassete_nextsample
mov ebp,localpos
add ebp,ebp
add ebp,soundbuffer
mov al,byte ptr [ebp]
mov dl,byte ptr [ebp+1]
cmp al,17
jne compose_channel_notcassete
mov ppicassete,dl
compose_channel_notcassete:
inc localpos
mov ebp,localpos
shl ebp,2
add ebp,timebuffer
mov ebp,dword ptr [ebp]
shl ebp,8
mov al,ppicassete
compose_cassete_nextsample:
dec edi
jnz compose_cassete_loop
ret
; compose_channel ----------------------------------------------------
; compose and mix a PSG square channel
; enter: actual_channel
compose_channel:
mov esi,offset psgregstack
mov edi,offset PSGreg
mov ecx,16/4
rep movsd
mov edi,actual_channel
mov esi,dword ptr [offset PSGcounter+edi*4]
mov eax,dword ptr [offset PSGstate+edi*4]
mov ecx,0
mov ebp,timebuffer
mov ebp,[ebp]
shl ebp,8
; make the patches
mov edi,dmatemp
mov dword ptr [offset patch1+2],edi
mov dword ptr [offset patch2+2],edi
mov dword ptr [offset patch3+2],edi
mov dword ptr [offset patch4+2],edi
mov dword ptr [offset patch5+2],edi
mov dword ptr [offset patch6+2],edi
mov dword ptr [offset patch8+2],edi
mov dword ptr [offset patch9+2],edi
; play from position 0
mov edi,0
call modify_parameters