protected ay8910_device(machine_config mconfig, device_type type, string tag, device_t owner, u32 clock,
psg_type_t psg_type, int streams, int ioports)
: base(mconfig, type, tag, owner, clock)
{
m_class_interfaces.Add(new device_sound_interface_ay8910(mconfig, this)); // device_sound_interface(mconfig, *this);
m_type = psg_type;
m_streams = streams;
m_ioports = ioports;
m_ready = 0;
m_channel = null;
m_active = false;
m_register_latch = 0;
m_last_enable = 0;
m_prescale_noise = 0;
m_count_noise = 0;
m_count_env = 0;
m_env_step = 0;
m_env_volume = 0;
m_hold = 0;
m_alternate = 0;
m_attack = 0;
m_holding = 0;
m_rng = 0;
m_env_step_mask = psg_type == psg_type_t.PSG_TYPE_AY ? (byte)0x0f : (byte)0x1f;
m_step = psg_type == psg_type_t.PSG_TYPE_AY ? 2 : 1;
m_zero_is_off = psg_type == psg_type_t.PSG_TYPE_AY ? 1 : 0;
m_par = psg_type == psg_type_t.PSG_TYPE_AY ? ay8910_param : ym2149_param;
m_par_env = psg_type == psg_type_t.PSG_TYPE_AY ? ay8910_param : ym2149_param_env;
m_flags = AY8910_LEGACY_OUTPUT;
m_port_a_read_cb = new devcb_read8(this);
m_port_b_read_cb = new devcb_read8(this);
m_port_a_write_cb = new devcb_write8(this);
m_port_b_write_cb = new devcb_write8(this);
memset(m_regs, (byte)0);
memset(m_count, 0);
memset(m_output, (byte)0);
memset(m_vol_enabled, (byte)0);
memset(m_vol_table, 0);
memset(m_env_table, 0);
m_res_load[0] = m_res_load[1] = m_res_load[2] = 1000; //Default values for resistor loads
set_type(psg_type);
}
// device_sound_interface - sound stream update overrides
//virtual void sound_stream_update(sound_stream &stream, stream_sample_t **inputs, stream_sample_t **outputs, int samples);
// trampolines for callbacks from fm.cpp
//static void psg_set_clock(device_t *device, int clock) { downcast<ay8910_device *>(device)->ay_set_clock(clock); }
//static void psg_write(device_t *device, int address, int data) { downcast<ay8910_device *>(device)->ay8910_write_ym(address, data); }
//static int psg_read(device_t *device) { return downcast<ay8910_device *>(device)->ay8910_read_ym(); }
//static void psg_reset(device_t *device) { downcast<ay8910_device *>(device)->ay8910_reset_ym(); }
// internal helpers
void set_type(psg_type_t psg_type)
{
m_type = psg_type;
if (psg_type == psg_type_t.PSG_TYPE_AY)
{
m_env_step_mask = 0x0f;
m_step = 2;
m_zero_is_off = 1;
m_par = ay8910_param;
m_par_env = ay8910_param;
}
else
{
m_env_step_mask = 0x1f;
m_step = 1;
m_zero_is_off = 0;
m_par = ym2149_param;
m_par_env = ym2149_param_env;
}
}
