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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

    Copyright MESS Team.
    Visit http://mamedev.org for licensing and usage restrictions.

**********************************************************************/

#include "cb2snd.h"

//**************************************************************************
//  DEVICE DEFINITIONS
//**************************************************************************

const device_type PET_USERPORT_CB2_SOUND_DEVICE = &device_creator<pet_userport_cb2_sound_device>;

#define DAC_TAG         "dac"

MACHINE_CONFIG_FRAGMENT( cb2snd )
	MCFG_SPEAKER_STANDARD_MONO("cb2spkr")
	MCFG_SOUND_ADD(DAC_TAG, DAC, 0)
	MCFG_SOUND_ROUTE(ALL_OUTPUTS, "cb2spkr", 1.00)
MACHINE_CONFIG_END

//-------------------------------------------------
//  machine_config_additions - device-specific
//  machine configurations
//-------------------------------------------------

machine_config_constructor pet_userport_cb2_sound_device::device_mconfig_additions() const
{
	return MACHINE_CONFIG_NAME( cb2snd );
}

//**************************************************************************
//  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 clock) :
	device_t(mconfig, PET_USERPORT_CB2_SOUND_DEVICE, "PET Userport 'CB2 Sound' Device", tag, owner, clock, "petucb2", __FILE__),
	device_pet_user_port_interface(mconfig, *this),
	m_dac(*this, DAC_TAG)
{
}


//-------------------------------------------------
//  device_start - device-specific startup
//-------------------------------------------------

void pet_userport_cb2_sound_device::device_start()
{
}

DECLARE_WRITE_LINE_MEMBER( pet_userport_cb2_sound_device::input_m )
{
	m_dac->write_unsigned8(state ? 0xff : 0x00);
}