enum
{
        SN76496,
        NCR8496,
        PSSJ
};

extern const device_t sn76489_device;
extern const device_t ncr8496_device;

extern int sn76489_mute;

typedef struct sn76489_t
{
        int stat[4];
        int latch[4], count[4];
        int freqlo[4], freqhi[4];
        int vol[4];
        uint32_t shift;
        uint8_t noise;
        int lasttone;
        uint8_t firstdat;
        int type;
        int extra_divide;
        
        int16_t buffer[SOUNDBUFLEN];
        int pos;
        
        double psgconst;
} sn76489_t;

void sn76489_init(sn76489_t *sn76489, uint16_t base, uint16_t size, int type, int freq);
void sn74689_set_extra_divide(sn76489_t *sn76489, int enable);