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// license:BSD-3-Clause
// copyright-holders:R. Belmont
/**********************************************************************
Commodore PET userport "CB2 sound" audio device emulation
http://zimmers.net/cbmpics/cbm/PETx/petfaq.html
**********************************************************************/
#include "emu.h"
#include "cb2snd.h"
#include "speaker.h"
//**************************************************************************
// DEVICE DEFINITIONS
//**************************************************************************
DEFINE_DEVICE_TYPE(PET_USERPORT_CB2_SOUND_DEVICE, pet_userport_cb2_sound_device, "petucb2", "PET Userport 'CB2 Sound' Device")
//-------------------------------------------------
// device_add_mconfig - add device configuration
//-------------------------------------------------
void pet_userport_cb2_sound_device::device_add_mconfig(machine_config &config)
{
SPEAKER(config, "speaker").front_center();
DAC_1BIT(config, m_dac, 0).add_route(ALL_OUTPUTS, "speaker", 0.99);
}
//**************************************************************************
// LIVE DEVICE
//**************************************************************************
//-------------------------------------------------
// pet_userport_cb2_sound_device - constructor
//-------------------------------------------------
pet_userport_cb2_sound_device::pet_userport_cb2_sound_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) :
device_t(mconfig, PET_USERPORT_CB2_SOUND_DEVICE, tag, owner, clock),
device_pet_user_port_interface(mconfig, *this),
m_dac(*this, "dac")
{
}
//-------------------------------------------------
// device_start - device-specific startup
//-------------------------------------------------
void pet_userport_cb2_sound_device::device_start()
{
}
void pet_userport_cb2_sound_device::input_m(int state)
{
m_dac->write(state);
}
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