86Box/src/sound/snd_pas16.c

#include <stdarg.h>
#include <stdint.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <wchar.h>
#define HAVE_STDARG_H
#include "../86box.h"
#include "../cpu/cpu.h"
#include "../io.h"
#include "../pic.h"
#include "../timer.h"
#include "../pit.h"
#include "../dma.h"
#include "../device.h"
#include "sound.h"
#include "filters.h"
#include "snd_mpu401.h"
#include "snd_opl.h"
#include "snd_sb.h"
#include "snd_sb_dsp.h"
#include "snd_pas16.h"


/*      Original PAS uses
                2 x OPL2
                PIT - sample rate/count
                LMC835N/LMC1982 - mixer
                YM3802 - MIDI Control System
                

        9A01 - IO base
                base >> 2
                
        All below + IO base

        B89 - interrupt status / clear
                bit 2 - sample rate
                bit 3 - PCM
                bit 4 - MIDI
        
        B88 - Audio mixer control register
        
        B8A - Audio filter control
                bit 5 - mute?
        
        B8B - interrupt mask / board ID
                bits 5-7 - board ID (read only on PAS16)

        F88 - PCM data (low)
        
        F89 - PCM data (high)
        
        F8A - PCM control?
                bit 4 - input/output select (1 = output)
                bit 5 - mono/stereo select
                bit 6 - PCM enable
                
        1388-138b - PIT clocked at 1193180 Hz
                1388 - sample rate
                1389 - sample count
                
        178b - 
        2789 - board revision
        
        8389 -
                bit 2 - 8/16 bit
                
        BF88 - wait states
        
        EF8B -
                bit 3 - 16 bits okay ?
                 
        F388 - 
                bit 6 - joystick enable
        
        F389 -
                bits 0-2 - DMA
                
        F38A -
                bits 0-3 - IRQ

        F788 -
                bit 1 - SB emulation
                bit 0 - MPU401 emulation
                
        F789 - SB base addr
                bits 0-3 - addr bits 4-7
        
        FB8A - SB IRQ/DMA
                bits 3-5 - IRQ
                bits 6-7 - DMA
        
        FF88 - board model
                3 = PAS16
*/

typedef struct pas16_t
{
        uint16_t base;
        
        int irq, dma;
 
        uint8_t audiofilt;
        
        uint8_t audio_mixer;
               
        uint8_t compat, compat_base;
        
        uint8_t enhancedscsi;
        
        uint8_t io_conf_1, io_conf_2, io_conf_3, io_conf_4;
        
        uint8_t irq_stat, irq_ena;
        
        uint8_t pcm_ctrl;
        uint16_t pcm_dat;

        uint16_t pcm_dat_l, pcm_dat_r;
                
        uint8_t sb_irqdma;
        
        int stereo_lr;
        
        uint8_t sys_conf_1, sys_conf_2, sys_conf_3, sys_conf_4;
        
        struct
        {
                uint32_t l[3];
                int64_t c[3];
                pc_timer_t timer[3];
                uint8_t m[3];
                uint8_t ctrl, ctrls[2];
                int wp, rm[3], wm[3];
                uint16_t rl[3];
                int thit[3];
                int delay[3];
                int rereadlatch[3];
                int64_t enable[3];
        } pit;

        opl_t    opl;
        sb_dsp_t dsp;

        int16_t pcm_buffer[2][SOUNDBUFLEN];

        int pos;
} pas16_t;

static uint8_t pas16_pit_in(uint16_t port, void *priv);
static void pas16_pit_out(uint16_t port, uint8_t val, void *priv);
static void pas16_update(pas16_t *pas16);

static int pas16_dmas[8] = {4, 1, 2, 3, 0, 5, 6, 7};
static int pas16_irqs[16] = {0, 2, 3, 4, 5, 6, 7, 10, 11, 12, 14, 15, 0, 0, 0, 0};
static int pas16_sb_irqs[8] = {0, 2, 3, 5, 7, 10, 11, 12};
static int pas16_sb_dmas[8] = {0, 1, 2, 3};

enum
{
        PAS16_INT_SAMP = 0x04,
        PAS16_INT_PCM  = 0x08
};

enum
{
        PAS16_PCM_MONO = 0x20,
        PAS16_PCM_ENA  = 0x40
};

enum
{
        PAS16_SC2_16BIT = 0x04,
        PAS16_SC2_MSBINV = 0x10
};

enum
{
        PAS16_FILT_MUTE = 0x20
};


#ifdef ENABLE_PAS16_LOG
int pas16_do_log = ENABLE_PAS16_LOG;


static void
pas16_log(const char *fmt, ...)
{
    va_list ap;

    if (pas16_do_log) {
	va_start(ap, fmt);
	pclog_ex(fmt, ap);
	va_end(ap);
    }
}
#else
#define pas16_log(fmt, ...)
#endif


static uint8_t pas16_in(uint16_t port, void *p)
{
        pas16_t *pas16 = (pas16_t *)p;
        uint8_t temp = 0xff;
        switch ((port - pas16->base) + 0x388)
        {
                case 0x388: case 0x389: case 0x38a: case 0x38b:
                temp = opl3_read((port - pas16->base) + 0x388, &pas16->opl);
                break;
                
                case 0xb88:
                temp = pas16->audio_mixer;
                break;
                
                case 0xb89:
                temp = pas16->irq_stat;
                break;
        
                case 0xb8a:
                temp = pas16->audiofilt;
                break;
                        
                case 0xb8b:
                temp = (pas16->irq_ena & ~0xe0) | 0x20;
                break;
                
                case 0xf8a:
                temp = pas16->pcm_ctrl;
                break;
                                
                case 0x1388: case 0x1389: case 0x138a: case 0x138b:
                temp = pas16_pit_in(port, pas16);
                break;

                case 0x2789: /*Board revision*/
                temp = 0;
                break;
                
                case 0x7f89:
                temp = pas16->enhancedscsi & ~1;
                break;
                
                case 0x8388:
                temp = pas16->sys_conf_1;
                break;
                case 0x8389:
                temp = pas16->sys_conf_2;
                break;
                case 0x838b:
                temp = pas16->sys_conf_3;
                break;
                case 0x838c:
                temp = pas16->sys_conf_4;
                break;
                
                case 0xef8b:
                temp = 0x0c;
                break;

                case 0xf388:
                temp = pas16->io_conf_1;
                break;
                case 0xf389:
                temp = pas16->io_conf_2;
                break;
                case 0xf38b:
                temp = pas16->io_conf_3;
                break;
                case 0xf38c:
                temp = pas16->io_conf_4;
                break;

                case 0xf788:
                temp = pas16->compat;
                break;
                case 0xf789:
                temp = pas16->compat_base;
                break;
                
                case 0xfb8a:
                temp = pas16->sb_irqdma;
                break;

                case 0xff88: /*Board model*/
                temp = 4; /*PAS16*/
                break;
                case 0xff8b: /*Master mode read*/
                temp = 0x20 | 0x10 | 0x01; /*AT bus, XT/AT timing*/
                break;
        }
	pas16_log("pas16_in : port %04X return %02X  %04X:%04X\n", port, temp, CS,cpu_state.pc);
        return temp;
}

static void pas16_out(uint16_t port, uint8_t val, void *p)
{
        pas16_t *pas16 = (pas16_t *)p;
	pas16_log("pas16_out : port %04X val %02X  %04X:%04X\n", port, val, CS,cpu_state.pc);
        switch ((port - pas16->base) + 0x388)
        {
                case 0x388: case 0x389: case 0x38a: case 0x38b:
                opl3_write((port - pas16->base) + 0x388, val, &pas16->opl);
                break;
                
                case 0xb88:
                pas16->audio_mixer = val;
                break;

                case 0xb89:
                pas16->irq_stat &= ~val;
                break;

                case 0xb8a:
                pas16_update(pas16);
                pas16->audiofilt = val;
                break;

                case 0xb8b:
                pas16->irq_ena = val;
                break;

                case 0xf88:
                pas16_update(pas16);
                pas16->pcm_dat = (pas16->pcm_dat & 0xff00) | val;
                break;
                case 0xf89:
                pas16_update(pas16);
                pas16->pcm_dat = (pas16->pcm_dat & 0x00ff) | (val << 8);
                break;               
                case 0xf8a:
                if ((val & PAS16_PCM_ENA) && !(pas16->pcm_ctrl & PAS16_PCM_ENA)) /*Guess*/
                        pas16->stereo_lr = 0;
                pas16->pcm_ctrl = val;
                break;
                
                case 0x1388: case 0x1389: case 0x138a: case 0x138b:
                pas16_pit_out(port, val, pas16);
                break;

                case 0x7f89:
                pas16->enhancedscsi = val;
                break;

                case 0x8388:
                pas16->sys_conf_1 = val;
                break;
                case 0x8389:
                pas16->sys_conf_2 = val;
                break;
                case 0x838a:
                pas16->sys_conf_3 = val;
                break;
                case 0x838b:
                pas16->sys_conf_4 = val;
                break;

                case 0xf388:
                pas16->io_conf_1 = val;
                break;
                case 0xf389:
                pas16->io_conf_2 = val;
                pas16->dma = pas16_dmas[val & 0x7];
                pas16_log("pas16_out : set PAS DMA %i\n", pas16->dma);
                break;
                case 0xf38a:
                pas16->io_conf_3 = val;
                pas16->irq = pas16_irqs[val & 0xf];
                pas16_log("pas16_out : set PAS IRQ %i\n", pas16->irq);
                break;
                case 0xf38b:
                pas16->io_conf_4 = val;
                break;

                case 0xf788:
                pas16->compat = val;
                if (pas16->compat & 0x02)
                        sb_dsp_setaddr(&pas16->dsp, ((pas16->compat_base & 0xf) << 4) | 0x200);
                else
                        sb_dsp_setaddr(&pas16->dsp, 0);
                break;
                case 0xf789:
                pas16->compat_base = val;
                if (pas16->compat & 0x02)
                        sb_dsp_setaddr(&pas16->dsp, ((pas16->compat_base & 0xf) << 4) | 0x200);
                break;
                
                case 0xfb8a:
                pas16->sb_irqdma = val;
                sb_dsp_setirq(&pas16->dsp, pas16_sb_irqs[(val >> 3) & 7]);
                sb_dsp_setdma8(&pas16->dsp, pas16_sb_dmas[(val >> 6) & 3]);
                pas16_log("pas16_out : set SB IRQ %i DMA %i\n", pas16_sb_irqs[(val >> 3) & 7], pas16_sb_dmas[(val >> 6) & 3]);
                break;
                
                default:
                pas16_log("pas16_out : unknown %04X\n", port);
        }
        if (cpu_state.pc == 0x80048CF3)
        {
                if (output)
                        fatal("here\n");
                output = 3;
        }
}

static void pas16_pit_out(uint16_t port, uint8_t val, void *p)
{
        pas16_t *pas16 = (pas16_t *)p;
        int t;
        switch (port & 3)
        {
                case 3: /*CTRL*/
                if ((val & 0xC0) == 0xC0)
                {
                        if (!(val & 0x20))
                        {
                                if (val & 2) pas16->pit.rl[0] = timer_get_remaining_u64(&pit.timer[0]) / PITCONST;;
                                if (val & 4) pas16->pit.rl[1] = pas16->pit.c[1];
                                if (val & 8) pas16->pit.rl[2] = pas16->pit.c[2];
                        }
                        return;
                }
                t = val >> 6;
                pas16->pit.ctrls[t] = pas16->pit.ctrl = val;
                if (t == 3)
                {
                        printf("Bad PIT reg select\n");
                        return;
                }
                if (!(pas16->pit.ctrl & 0x30))
                {
			if (!t)
                                pas16->pit.rl[t] = timer_get_remaining_u64(&pit.timer[t]) / PITCONST;
			else
			{
	                        pas16->pit.rl[t] = pas16->pit.c[t];
	                        if (pas16->pit.c[t] < 0)
	                                pas16->pit.rl[t] = 0;
			}
                        pas16->pit.ctrl |= 0x30;
                        pas16->pit.rereadlatch[t] = 0;
                        pas16->pit.rm[t] = 3;
                }
                else
                {
                        pas16->pit.rm[t] = pas16->pit.wm[t] = (pas16->pit.ctrl >> 4) & 3;
                        pas16->pit.m[t] = (val >> 1) & 7;
                        if (pas16->pit.m[t] > 5)
                                pas16->pit.m[t] &= 3;
                        if (!pas16->pit.rm[t])
                        {
                                pas16->pit.rm[t] = 3;
				if (!t)
                                        pas16->pit.rl[t] = timer_get_remaining_u64(&pit.timer[t]) / PITCONST;
				else
	                                pas16->pit.rl[t] = pas16->pit.c[t];
                        }
                        pas16->pit.rereadlatch[t] = 1;
                }
                pas16->pit.wp = 0;
                pas16->pit.thit[t] = 0;
                break;
                case 0: case 1: case 2: /*Timers*/
                t = port & 3;
                switch (pas16->pit.wm[t])
                {
                        case 1:
                        pas16->pit.l[t] = val;
                        pas16->pit.thit[t] = 0;
                        pas16->pit.c[t] = pas16->pit.l[t];
                        if (!t)
                                timer_set_delay_u64(&pas16->pit.timer[t], pas16->pit.c[t] * PITCONST);
                        pas16->pit.enable[t] = 1;
                        break;
                        case 2:
                        pas16->pit.l[t] = val << 8;
                        pas16->pit.thit[t] = 0;
                        pas16->pit.c[t] = pas16->pit.l[t];
                        if (!t)
                                timer_set_delay_u64(&pas16->pit.timer[t], pas16->pit.c[t] * PITCONST);
                        pas16->pit.enable[t] = 1;
                        break;
                        case 0:
                        pas16->pit.l[t] &= 0xFF;
                        pas16->pit.l[t] |= (val << 8);
                        pas16->pit.c[t] = pas16->pit.l[t];
                        if (!t)
                                timer_set_delay_u64(&pas16->pit.timer[t], pas16->pit.c[t] * PITCONST);
                        pas16->pit.thit[t] = 0;
                        pas16->pit.wm[t] = 3;
                        pas16->pit.enable[t] = 1;
                        break;
                        case 3:
                        pas16->pit.l[t] &= 0xFF00;
                        pas16->pit.l[t] |= val;
                        pas16->pit.wm[t] = 0;                        
                        break;
                }
                if (!pas16->pit.l[t])
                {
                        pas16->pit.l[t] |= 0x10000;
                        pas16->pit.c[t] = pas16->pit.l[t];
                        if (!t)
                                timer_set_delay_u64(&pas16->pit.timer[t], pas16->pit.c[t] * PITCONST);
                }
                break;
        }
}

static uint8_t pas16_pit_in(uint16_t port, void *p)
{
        pas16_t *pas16 = (pas16_t *)p;
        uint8_t temp = 0xff;
        int t = port & 3;
        switch (port & 3)
        {
                case 0: case 1: case 2: /*Timers*/
                if (pas16->pit.rereadlatch[t])
                {
                        pas16->pit.rereadlatch[t] = 0;
                        if (!t)
                        {
                                pas16->pit.rl[t] = timer_get_remaining_u64(&pit.timer[t]) / PITCONST;
                                if ((timer_get_remaining_u64(&pit.timer[t]) / PITCONST) > 65536) 
                                        pas16->pit.rl[t] = 0xFFFF;
                        }
                        else
                        {
                                pas16->pit.rl[t] = pas16->pit.c[t];
                                if (pas16->pit.c[t] > 65536) 
                                        pas16->pit.rl[t] = 0xFFFF;
                        }
                }
                switch (pas16->pit.rm[t])
                {
                        case 0:
                        temp = pas16->pit.rl[t] >> 8;
                        pas16->pit.rm[t] = 3;
                        pas16->pit.rereadlatch[t] = 1;
                        break;
                        case 1:
                        temp = (pas16->pit.rl[t]) & 0xFF;
                        pas16->pit.rereadlatch[t] = 1;
                        break;
                        case 2:
                        temp = (pas16->pit.rl[t]) >> 8;
                        pas16->pit.rereadlatch[t] = 1;
                        break;
                        case 3:
                        temp = (pas16->pit.rl[t]) & 0xFF;
                        if (pas16->pit.m[t] & 0x80) pas16->pit.m[t] &= 7;
                        else pas16->pit.rm[t] = 0;
                        break;
                }
                break;
                case 3: /*Control*/
                temp = pas16->pit.ctrl;
                break;
        }
        return temp;
}

static uint8_t pas16_readdma(pas16_t *pas16)
{
        return dma_channel_read(pas16->dma);
}

static void pas16_pcm_poll(void *p)
{
        pas16_t *pas16 = (pas16_t *)p;
        
        pas16_update(pas16);
        if (pas16->pit.m[0] & 2)
        {
                if (pas16->pit.l[0]) 
                        timer_advance_u64(&pas16->pit.timer[0], pas16->pit.l[0] * PITCONST);
                else                
                        timer_advance_u64(&pas16->pit.timer[0], 0x10000 * PITCONST);
        }
        else
        {
                pas16->pit.enable[0] = 0;
        }

        pas16->irq_stat |= PAS16_INT_SAMP;
        if (pas16->irq_ena & PAS16_INT_SAMP)
                picint(1 << pas16->irq);
        
        /*Update sample rate counter*/
        if (pas16->pit.enable[1])
        {               
                if (pas16->pcm_ctrl & PAS16_PCM_ENA)
                {
                        uint16_t temp;
                        
                        if (pas16->sys_conf_2 & PAS16_SC2_16BIT)
                        {
                                temp = pas16_readdma(pas16) << 8;
                                temp |= pas16_readdma(pas16);
                        }
                        else
                                temp = (pas16_readdma(pas16) ^ 0x80) << 8;
                        
                        if (pas16->sys_conf_2 & PAS16_SC2_MSBINV)
                                temp ^= 0x8000;
                        if (pas16->pcm_ctrl & PAS16_PCM_MONO)
                                pas16->pcm_dat_l = pas16->pcm_dat_r = temp;
                        else
                        {
                                if (pas16->stereo_lr)
                                        pas16->pcm_dat_r = temp;
                                else
                                        pas16->pcm_dat_l = temp;
                                        
                                pas16->stereo_lr = !pas16->stereo_lr;
                        }
                }
                if (pas16->sys_conf_2 & PAS16_SC2_16BIT)
                        pas16->pit.c[1] -= 2;
                else
                        pas16->pit.c[1]--;
                if (pas16->pit.c[1] == 0)
                {
                        if (pas16->pit.m[1] & 2)
                        {
                                if (pas16->pit.l[1]) 
                                        pas16->pit.c[1] += pas16->pit.l[1];
                                else                
                                        pas16->pit.c[1] += 0x10000;
                        }
                        else
                        {
                                pas16->pit.c[1] = -1;
                                pas16->pit.enable[1] = 0;
                        }
                
                        pas16->irq_stat |= PAS16_INT_PCM;
                        if (pas16->irq_ena & PAS16_INT_PCM)
                        {
                                pas16_log("pas16_pcm_poll : cause IRQ %i %02X\n", pas16->irq, 1 << pas16->irq);
                                picint(1 << pas16->irq);
                        }
                }
        }
}

static void pas16_out_base(uint16_t port, uint8_t val, void *p)
{
        pas16_t *pas16 = (pas16_t *)p;

        io_removehandler((pas16->base - 0x388) + 0x0388, 0x0004, pas16_in, NULL, NULL, pas16_out, NULL, NULL,  pas16);
        io_removehandler((pas16->base - 0x388) + 0x0788, 0x0004, pas16_in, NULL, NULL, pas16_out, NULL, NULL,  pas16);
        io_removehandler((pas16->base - 0x388) + 0x0b88, 0x0004, pas16_in, NULL, NULL, pas16_out, NULL, NULL,  pas16);
        io_removehandler((pas16->base - 0x388) + 0x0f88, 0x0004, pas16_in, NULL, NULL, pas16_out, NULL, NULL,  pas16);
        io_removehandler((pas16->base - 0x388) + 0x1388, 0x0004, pas16_in, NULL, NULL, pas16_out, NULL, NULL,  pas16);
        io_removehandler((pas16->base - 0x388) + 0x1788, 0x0004, pas16_in, NULL, NULL, pas16_out, NULL, NULL,  pas16);
        io_removehandler((pas16->base - 0x388) + 0x2788, 0x0004, pas16_in, NULL, NULL, pas16_out, NULL, NULL,  pas16);
        io_removehandler((pas16->base - 0x388) + 0x7f88, 0x0004, pas16_in, NULL, NULL, pas16_out, NULL, NULL,  pas16);
        io_removehandler((pas16->base - 0x388) + 0x8388, 0x0004, pas16_in, NULL, NULL, pas16_out, NULL, NULL,  pas16);
        io_removehandler((pas16->base - 0x388) + 0xbf88, 0x0004, pas16_in, NULL, NULL, pas16_out, NULL, NULL,  pas16);
        io_removehandler((pas16->base - 0x388) + 0xe388, 0x0004, pas16_in, NULL, NULL, pas16_out, NULL, NULL,  pas16);
        io_removehandler((pas16->base - 0x388) + 0xe788, 0x0004, pas16_in, NULL, NULL, pas16_out, NULL, NULL,  pas16);
        io_removehandler((pas16->base - 0x388) + 0xeb88, 0x0004, pas16_in, NULL, NULL, pas16_out, NULL, NULL,  pas16);
        io_removehandler((pas16->base - 0x388) + 0xef88, 0x0004, pas16_in, NULL, NULL, pas16_out, NULL, NULL,  pas16);
        io_removehandler((pas16->base - 0x388) + 0xf388, 0x0004, pas16_in, NULL, NULL, pas16_out, NULL, NULL,  pas16);
        io_removehandler((pas16->base - 0x388) + 0xf788, 0x0004, pas16_in, NULL, NULL, pas16_out, NULL, NULL,  pas16);
        io_removehandler((pas16->base - 0x388) + 0xfb88, 0x0004, pas16_in, NULL, NULL, pas16_out, NULL, NULL,  pas16);
        io_removehandler((pas16->base - 0x388) + 0xff88, 0x0004, pas16_in, NULL, NULL, pas16_out, NULL, NULL,  pas16);
        
        pas16->base = val << 2;
        pas16_log("pas16_write_base : PAS16 base now at %04X\n", pas16->base);

        io_sethandler((pas16->base - 0x388) + 0x0388, 0x0004, pas16_in, NULL, NULL, pas16_out, NULL, NULL,  pas16);
        io_sethandler((pas16->base - 0x388) + 0x0788, 0x0004, pas16_in, NULL, NULL, pas16_out, NULL, NULL,  pas16);
        io_sethandler((pas16->base - 0x388) + 0x0b88, 0x0004, pas16_in, NULL, NULL, pas16_out, NULL, NULL,  pas16);
        io_sethandler((pas16->base - 0x388) + 0x0f88, 0x0004, pas16_in, NULL, NULL, pas16_out, NULL, NULL,  pas16);
        io_sethandler((pas16->base - 0x388) + 0x1388, 0x0004, pas16_in, NULL, NULL, pas16_out, NULL, NULL,  pas16);
        io_sethandler((pas16->base - 0x388) + 0x1788, 0x0004, pas16_in, NULL, NULL, pas16_out, NULL, NULL,  pas16);
        io_sethandler((pas16->base - 0x388) + 0x2788, 0x0004, pas16_in, NULL, NULL, pas16_out, NULL, NULL,  pas16);
        io_sethandler((pas16->base - 0x388) + 0x7f88, 0x0004, pas16_in, NULL, NULL, pas16_out, NULL, NULL,  pas16);
        io_sethandler((pas16->base - 0x388) + 0x8388, 0x0004, pas16_in, NULL, NULL, pas16_out, NULL, NULL,  pas16);
        io_sethandler((pas16->base - 0x388) + 0xbf88, 0x0004, pas16_in, NULL, NULL, pas16_out, NULL, NULL,  pas16);
        io_sethandler((pas16->base - 0x388) + 0xe388, 0x0004, pas16_in, NULL, NULL, pas16_out, NULL, NULL,  pas16);
        io_sethandler((pas16->base - 0x388) + 0xe788, 0x0004, pas16_in, NULL, NULL, pas16_out, NULL, NULL,  pas16);
        io_sethandler((pas16->base - 0x388) + 0xeb88, 0x0004, pas16_in, NULL, NULL, pas16_out, NULL, NULL,  pas16);
        io_sethandler((pas16->base - 0x388) + 0xef88, 0x0004, pas16_in, NULL, NULL, pas16_out, NULL, NULL,  pas16);
        io_sethandler((pas16->base - 0x388) + 0xf388, 0x0004, pas16_in, NULL, NULL, pas16_out, NULL, NULL,  pas16);
        io_sethandler((pas16->base - 0x388) + 0xf788, 0x0004, pas16_in, NULL, NULL, pas16_out, NULL, NULL,  pas16);
        io_sethandler((pas16->base - 0x388) + 0xfb88, 0x0004, pas16_in, NULL, NULL, pas16_out, NULL, NULL,  pas16);
        io_sethandler((pas16->base - 0x388) + 0xff88, 0x0004, pas16_in, NULL, NULL, pas16_out, NULL, NULL,  pas16);
}


static void pas16_update(pas16_t *pas16)
{
        if (!(pas16->audiofilt & PAS16_FILT_MUTE))
        {
                for (; pas16->pos < sound_pos_global; pas16->pos++)
                {
                        pas16->pcm_buffer[0][pas16->pos] = 0;
                        pas16->pcm_buffer[1][pas16->pos] = 0;
                }
        }
        else
        {
                for (; pas16->pos < sound_pos_global; pas16->pos++)
                {
                        pas16->pcm_buffer[0][pas16->pos] = (int16_t)pas16->pcm_dat_l;
                        pas16->pcm_buffer[1][pas16->pos] = (int16_t)pas16->pcm_dat_r;
                }
        }
}

void pas16_get_buffer(int32_t *buffer, int len, void *p)
{
        pas16_t *pas16 = (pas16_t *)p;
        int c;

        opl3_update2(&pas16->opl);
        sb_dsp_update(&pas16->dsp);
        pas16_update(pas16);
        for (c = 0; c < len * 2; c++)
        {
                buffer[c] += pas16->opl.buffer[c];
                buffer[c] += (int16_t)(sb_iir(c & 1, (float)pas16->dsp.buffer[c]) / 1.3) / 2;
                buffer[c] += (pas16->pcm_buffer[c & 1][c >> 1] / 2);
        }

        pas16->pos = 0;
        pas16->opl.pos = 0;
        pas16->dsp.pos = 0;
}


static void *pas16_init(const device_t *info)
{
        pas16_t *pas16 = malloc(sizeof(pas16_t));
        memset(pas16, 0, sizeof(pas16_t));

        opl3_init(&pas16->opl);
        sb_dsp_init(&pas16->dsp, SB2);

        io_sethandler(0x9a01, 0x0001, NULL, NULL, NULL, pas16_out_base, NULL, NULL,  pas16);
        
        timer_add(&pas16->pit.timer[0], pas16_pcm_poll, pas16, 0);
        
        sound_add_handler(pas16_get_buffer, pas16);
        
        return pas16;
}

static void pas16_close(void *p)
{
        pas16_t *pas16 = (pas16_t *)p;
        
        free(pas16);
}

const device_t pas16_device =
{
        "Pro Audio Spectrum 16",
        DEVICE_ISA | DEVICE_NOT_WORKING,
	0,
        pas16_init, pas16_close, NULL,
        NULL, NULL, NULL,
	NULL
};