464 lines
8.2 KiB
C
464 lines
8.2 KiB
C
#include <string.h>
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#include "defs.h"
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#include "pcm.h"
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#include "sound.h"
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#include "cpu.h"
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#include "hw.h"
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#include "regs.h"
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#include "rc.h"
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#include "noise.h"
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#include "sys.h"
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const static byte dmgwave[16] =
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{
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0xac, 0xdd, 0xda, 0x48,
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0x36, 0x02, 0xcf, 0x16,
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0x2c, 0x04, 0xe5, 0x2c,
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0xac, 0xdd, 0xda, 0x48
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};
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const static byte cgbwave[16] =
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{
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0x00, 0xff, 0x00, 0xff,
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0x00, 0xff, 0x00, 0xff,
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0x00, 0xff, 0x00, 0xff,
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0x00, 0xff, 0x00, 0xff,
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};
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const static byte sqwave[4][8] =
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{
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{ 0, 0,-1, 0, 0, 0, 0, 0 },
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{ 0,-1,-1, 0, 0, 0, 0, 0 },
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{ -1,-1,-1,-1, 0, 0, 0, 0 },
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{ -1, 0, 0,-1,-1,-1,-1,-1 }
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};
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const static int freqtab[8] =
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{
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(1<<14)*2,
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(1<<14),
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(1<<14)/2,
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(1<<14)/3,
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(1<<14)/4,
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(1<<14)/5,
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(1<<14)/6,
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(1<<14)/7
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};
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struct snd snd;
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#define RATE (snd.rate)
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#define WAVE (snd.wave) /* ram.hi+0x30 */
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#define S1 (snd.ch[0])
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#define S2 (snd.ch[1])
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#define S3 (snd.ch[2])
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#define S4 (snd.ch[3])
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rcvar_t sound_exports[] =
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{
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RCV_END
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};
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static void s1_freq_d(int d)
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{
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if (RATE > (d<<4)) S1.freq = 0;
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else S1.freq = (RATE << 17)/d;
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}
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static void s1_freq()
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{
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s1_freq_d(2048 - (((R_NR14&7)<<8) + R_NR13));
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}
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static void s2_freq()
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{
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int d = 2048 - (((R_NR24&7)<<8) + R_NR23);
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if (RATE > (d<<4)) S2.freq = 0;
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else S2.freq = (RATE << 17)/d;
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}
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static void s3_freq()
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{
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int d = 2048 - (((R_NR34&7)<<8) + R_NR33);
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if (RATE > (d<<3)) S3.freq = 0;
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else S3.freq = (RATE << 21)/d;
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}
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static void s4_freq()
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{
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S4.freq = (freqtab[R_NR43&7] >> (R_NR43 >> 4)) * RATE;
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if (S4.freq >> 18) S4.freq = 1<<18;
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}
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void sound_dirty()
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{
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S1.swlen = ((R_NR10>>4) & 7) << 14;
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S1.len = (64-(R_NR11&63)) << 13;
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S1.envol = R_NR12 >> 4;
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S1.endir = (R_NR12>>3) & 1;
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S1.endir |= S1.endir - 1;
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S1.enlen = (R_NR12 & 7) << 15;
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s1_freq();
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S2.len = (64-(R_NR21&63)) << 13;
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S2.envol = R_NR22 >> 4;
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S2.endir = (R_NR22>>3) & 1;
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S2.endir |= S2.endir - 1;
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S2.enlen = (R_NR22 & 7) << 15;
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s2_freq();
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S3.len = (256-R_NR31) << 20;
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s3_freq();
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S4.len = (64-(R_NR41&63)) << 13;
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S4.envol = R_NR42 >> 4;
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S4.endir = (R_NR42>>3) & 1;
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S4.endir |= S4.endir - 1;
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S4.enlen = (R_NR42 & 7) << 15;
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s4_freq();
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}
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void sound_off()
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{
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memset(&S1, 0, sizeof S1);
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memset(&S2, 0, sizeof S2);
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memset(&S3, 0, sizeof S3);
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memset(&S4, 0, sizeof S4);
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R_NR10 = 0x80;
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R_NR11 = 0xBF;
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R_NR12 = 0xF3;
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R_NR14 = 0xBF;
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R_NR21 = 0x3F;
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R_NR22 = 0x00;
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R_NR24 = 0xBF;
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R_NR30 = 0x7F;
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R_NR31 = 0xFF;
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R_NR32 = 0x9F;
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R_NR33 = 0xBF;
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R_NR41 = 0xFF;
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R_NR42 = 0x00;
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R_NR43 = 0x00;
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R_NR44 = 0xBF;
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R_NR50 = 0x77;
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R_NR51 = 0xF3;
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R_NR52 = 0xF1;
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sound_dirty();
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}
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void sound_reset()
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{
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memset(&snd, 0, sizeof snd);
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if (pcm.hz) snd.rate = (1<<21) / pcm.hz;
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else snd.rate = 0;
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memcpy(WAVE, hw.cgb ? cgbwave : dmgwave, 16);
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memcpy(ram.hi+0x30, WAVE, 16);
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sound_off();
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}
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void sound_mix()
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{
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int s, l, r, f, n;
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if (!RATE || cpu.snd < RATE) return;
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for (; cpu.snd >= RATE; cpu.snd -= RATE)
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{
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l = r = 0;
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if (S1.on)
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{
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s = sqwave[R_NR11>>6][(S1.pos>>18)&7] & S1.envol;
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S1.pos += S1.freq;
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if ((R_NR14 & 64) && ((S1.cnt += RATE) >= S1.len))
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S1.on = 0;
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if (S1.enlen && (S1.encnt += RATE) >= S1.enlen)
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{
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S1.encnt -= S1.enlen;
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S1.envol += S1.endir;
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if (S1.envol < 0) S1.envol = 0;
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if (S1.envol > 15) S1.envol = 15;
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}
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if (S1.swlen && (S1.swcnt += RATE) >= S1.swlen)
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{
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S1.swcnt -= S1.swlen;
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f = S1.swfreq;
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n = (R_NR10 & 7);
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if (R_NR10 & 8) f -= (f >> n);
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else f += (f >> n);
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if (f > 2047)
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S1.on = 0;
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else
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{
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S1.swfreq = f;
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R_NR13 = f;
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R_NR14 = (R_NR14 & 0xF8) | (f>>8);
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s1_freq_d(2048 - f);
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}
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}
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s <<= 2;
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if (R_NR51 & 1) r += s;
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if (R_NR51 & 16) l += s;
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}
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if (S2.on)
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{
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s = sqwave[R_NR21>>6][(S2.pos>>18)&7] & S2.envol;
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S2.pos += S2.freq;
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if ((R_NR24 & 64) && ((S2.cnt += RATE) >= S2.len))
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S2.on = 0;
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if (S2.enlen && (S2.encnt += RATE) >= S2.enlen)
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{
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S2.encnt -= S2.enlen;
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S2.envol += S2.endir;
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if (S2.envol < 0) S2.envol = 0;
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if (S2.envol > 15) S2.envol = 15;
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}
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s <<= 2;
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if (R_NR51 & 2) r += s;
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if (R_NR51 & 32) l += s;
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}
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if (S3.on)
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{
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s = WAVE[(S3.pos>>22) & 15];
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if (S3.pos & (1<<21)) s &= 15;
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else s >>= 4;
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s -= 8;
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S3.pos += S3.freq;
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if ((R_NR34 & 64) && ((S3.cnt += RATE) >= S3.len))
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S3.on = 0;
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if (R_NR32 & 96) s <<= (3 - ((R_NR32>>5)&3));
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else s = 0;
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if (R_NR51 & 4) r += s;
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if (R_NR51 & 64) l += s;
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}
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if (S4.on)
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{
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if (R_NR43 & 8) s = 1 & (noise7[
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(S4.pos>>20)&15] >> (7-((S4.pos>>17)&7)));
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else s = 1 & (noise15[
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(S4.pos>>20)&4095] >> (7-((S4.pos>>17)&7)));
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s = (-s) & S4.envol;
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S4.pos += S4.freq;
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if ((R_NR44 & 64) && ((S4.cnt += RATE) >= S4.len))
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S4.on = 0;
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if (S4.enlen && (S4.encnt += RATE) >= S4.enlen)
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{
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S4.encnt -= S4.enlen;
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S4.envol += S4.endir;
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if (S4.envol < 0) S4.envol = 0;
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if (S4.envol > 15) S4.envol = 15;
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}
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s += s << 1;
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if (R_NR51 & 8) r += s;
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if (R_NR51 & 128) l += s;
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}
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l *= (R_NR50 & 0x07);
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r *= ((R_NR50 & 0x70)>>4);
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l >>= 4;
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r >>= 4;
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if (l > 127) l = 127;
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else if (l < -128) l = -128;
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if (r > 127) r = 127;
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else if (r < -128) r = -128;
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if (pcm.buf)
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{
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if (pcm.pos >= pcm.len)
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pcm_submit();
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if (pcm.stereo)
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{
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pcm.buf[pcm.pos++] = l+128;
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pcm.buf[pcm.pos++] = r+128;
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}
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else pcm.buf[pcm.pos++] = ((l+r)>>1)+128;
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}
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}
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R_NR52 = (R_NR52&0xf0) | S1.on | (S2.on<<1) | (S3.on<<2) | (S4.on<<3);
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}
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byte sound_read(byte r)
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{
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sound_mix();
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/* printf("read %02X: %02X\n", r, REG(r)); */
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return REG(r);
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}
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void s1_init()
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{
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S1.swcnt = 0;
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S1.swfreq = ((R_NR14&7)<<8) + R_NR13;
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S1.envol = R_NR12 >> 4;
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S1.endir = (R_NR12>>3) & 1;
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S1.endir |= S1.endir - 1;
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S1.enlen = (R_NR12 & 7) << 15;
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if (!S1.on) S1.pos = 0;
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S1.on = 1;
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S1.cnt = 0;
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S1.encnt = 0;
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}
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void s2_init()
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{
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S2.envol = R_NR22 >> 4;
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S2.endir = (R_NR22>>3) & 1;
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S2.endir |= S2.endir - 1;
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S2.enlen = (R_NR22 & 7) << 15;
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if (!S2.on) S2.pos = 0;
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S2.on = 1;
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S2.cnt = 0;
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S2.encnt = 0;
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}
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void s3_init()
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{
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int i;
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if (!S3.on) S3.pos = 0;
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S3.cnt = 0;
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S3.on = R_NR30 >> 7;
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if (S3.on) for (i = 0; i < 16; i++)
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ram.hi[i+0x30] = 0x13 ^ ram.hi[i+0x31];
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}
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void s4_init()
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{
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S4.envol = R_NR42 >> 4;
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S4.endir = (R_NR42>>3) & 1;
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S4.endir |= S4.endir - 1;
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S4.enlen = (R_NR42 & 7) << 15;
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S4.on = 1;
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S4.pos = 0;
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S4.cnt = 0;
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S4.encnt = 0;
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}
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void sound_write(byte r, byte b)
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{
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#if 0
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static void *timer;
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if (!timer) timer = sys_timer();
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printf("write %02X: %02X @ %d\n", r, b, sys_elapsed(timer));
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#endif
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if (!(R_NR52 & 128) && r != RI_NR52) return;
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if ((r & 0xF0) == 0x30)
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{
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if (S3.on) sound_mix();
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if (!S3.on)
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WAVE[r-0x30] = ram.hi[r] = b;
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return;
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}
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sound_mix();
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switch (r)
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{
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case RI_NR10:
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R_NR10 = b;
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S1.swlen = ((R_NR10>>4) & 7) << 14;
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S1.swfreq = ((R_NR14&7)<<8) + R_NR13;
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break;
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case RI_NR11:
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R_NR11 = b;
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S1.len = (64-(R_NR11&63)) << 13;
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break;
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case RI_NR12:
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R_NR12 = b;
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S1.envol = R_NR12 >> 4;
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S1.endir = (R_NR12>>3) & 1;
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S1.endir |= S1.endir - 1;
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S1.enlen = (R_NR12 & 7) << 15;
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break;
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case RI_NR13:
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R_NR13 = b;
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s1_freq();
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break;
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case RI_NR14:
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R_NR14 = b;
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s1_freq();
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if (b & 128) s1_init();
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break;
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case RI_NR21:
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R_NR21 = b;
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S2.len = (64-(R_NR21&63)) << 13;
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break;
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case RI_NR22:
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R_NR22 = b;
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S2.envol = R_NR22 >> 4;
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S2.endir = (R_NR22>>3) & 1;
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S2.endir |= S2.endir - 1;
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S2.enlen = (R_NR22 & 7) << 15;
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break;
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case RI_NR23:
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R_NR23 = b;
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s2_freq();
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break;
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case RI_NR24:
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R_NR24 = b;
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s2_freq();
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if (b & 128) s2_init();
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break;
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case RI_NR30:
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R_NR30 = b;
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if (!(b & 128)) S3.on = 0;
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break;
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case RI_NR31:
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R_NR31 = b;
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S3.len = (256-R_NR31) << 13;
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break;
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case RI_NR32:
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R_NR32 = b;
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break;
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case RI_NR33:
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R_NR33 = b;
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s3_freq();
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break;
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case RI_NR34:
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R_NR34 = b;
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s3_freq();
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if (b & 128) s3_init();
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break;
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case RI_NR41:
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R_NR41 = b;
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S4.len = (64-(R_NR41&63)) << 13;
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break;
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case RI_NR42:
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R_NR42 = b;
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S4.envol = R_NR42 >> 4;
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S4.endir = (R_NR42>>3) & 1;
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S4.endir |= S4.endir - 1;
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S4.enlen = (R_NR42 & 7) << 15;
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break;
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case RI_NR43:
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R_NR43 = b;
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s4_freq();
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break;
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case RI_NR44:
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R_NR44 = b;
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if (b & 128) s4_init();
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break;
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case RI_NR50:
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R_NR50 = b;
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break;
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case RI_NR51:
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R_NR51 = b;
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break;
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case RI_NR52:
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R_NR52 = b;
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if (!(R_NR52 & 128))
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sound_off();
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break;
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default:
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return;
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}
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}
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