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// license:BSD-3-Clause
// copyright-holders:R. Belmont
/*********************************************************************
a2dx1.c
Implementation of the Decillionix DX-1 sampler card
*********************************************************************/
#include "emu.h"
#include "a2dx1.h"
#include "sound/volt_reg.h"
#include "speaker.h"
/***************************************************************************
PARAMETERS
***************************************************************************/
//**************************************************************************
// GLOBAL VARIABLES
//**************************************************************************
DEFINE_DEVICE_TYPE(A2BUS_DX1, a2bus_dx1_device, "a2dx1", "Decillonix DX-1")
/***************************************************************************
FUNCTION PROTOTYPES
***************************************************************************/
//-------------------------------------------------
// device_add_mconfig - add device configuration
//-------------------------------------------------
void a2bus_dx1_device::device_add_mconfig(machine_config &config)
{
SPEAKER(config, "speaker").front_center();
DAC_8BIT_R2R(config, m_dac, 0).add_route(ALL_OUTPUTS, "speaker", 0.5); // unknown DAC
DAC_8BIT_R2R(config, m_dacvol, 0).add_route(0, "dac", 1.0, DAC_VREF_POS_INPUT).add_route(0, "dac", -1.0, DAC_VREF_NEG_INPUT); // unknown DAC
voltage_regulator_device &vref(VOLTAGE_REGULATOR(config, "vref"));
vref.add_route(0, "dacvol", 1.0, DAC_VREF_POS_INPUT);
}
//**************************************************************************
// LIVE DEVICE
//**************************************************************************
a2bus_dx1_device::a2bus_dx1_device(const machine_config &mconfig, device_type type, const char *tag, device_t *owner, uint32_t clock) :
device_t(mconfig, type, tag, owner, clock),
device_a2bus_card_interface(mconfig, *this),
m_dac(*this, "dac"),
m_dacvol(*this, "dacvol")
{
}
a2bus_dx1_device::a2bus_dx1_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) :
a2bus_dx1_device(mconfig, A2BUS_DX1, tag, owner, clock)
{
}
//-------------------------------------------------
// device_start - device-specific startup
//-------------------------------------------------
void a2bus_dx1_device::device_start()
{
}
uint8_t a2bus_dx1_device::read_c0nx(uint8_t offset)
{
switch (offset)
{
case 1: // ADC input
return 0;
case 3: // busy flag
return 0x80; // indicate not busy
case 7: // 1-bit ADC input (bit 7 of c0n1, probably)
return 0;
}
return 0xff;
}
void a2bus_dx1_device::write_c0nx(uint8_t offset, uint8_t data)
{
switch (offset)
{
case 5:
m_dacvol->write(data);
break;
case 6:
m_dac->write(data);
break;
}
}
bool a2bus_dx1_device::take_c800()
{
return false;
}
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