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// license:BSD-3-Clause
// copyright-holders:Dirk Best
/***************************************************************************
PMI DAC-76 COMDAC
Companding D/A Converter
___ ___
E/D 1 |* u | 10 VLC
SB 2 | | 11 VR+
B1 3 | | 12 VR-
B2 4 | | 13 V-
B3 5 | | 14 IOE+
B4 6 | | 15 IOE-
B5 7 | | 16 IOD+
B6 8 | | 17 IOD-
B7 9 |_______| 18 V+
***************************************************************************/
#ifndef MAME_SOUND_DAC76_H
#define MAME_SOUND_DAC76_H
#pragma once
//**************************************************************************
// TYPE DEFINITIONS
//**************************************************************************
class dac76_device : public device_t, public device_sound_interface
{
public:
// construction/destruction
dac76_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock);
// chord
DECLARE_WRITE_LINE_MEMBER(b1_w) { m_chord &= ~(1 << 2); m_chord |= (state << 2); };
DECLARE_WRITE_LINE_MEMBER(b2_w) { m_chord &= ~(1 << 1); m_chord |= (state << 1); };
DECLARE_WRITE_LINE_MEMBER(b3_w) { m_chord &= ~(1 << 0); m_chord |= (state << 0); };
// step
DECLARE_WRITE_LINE_MEMBER(b4_w) { m_step &= ~(1 << 3); m_step |= (state << 3); };
DECLARE_WRITE_LINE_MEMBER(b5_w) { m_step &= ~(1 << 2); m_step |= (state << 2); };
DECLARE_WRITE_LINE_MEMBER(b6_w) { m_step &= ~(1 << 1); m_step |= (state << 1); };
DECLARE_WRITE_LINE_MEMBER(b7_w) { m_step &= ~(1 << 0); m_step |= (state << 0); };
// sign bit
DECLARE_WRITE_LINE_MEMBER(sb_w) { m_sb = bool(state); };
void update() { m_stream->update(); }
protected:
// device-level overrides
virtual void device_start() override;
virtual void device_reset() override;
virtual void sound_stream_update(sound_stream &stream, stream_sample_t **inputs, stream_sample_t **outputs, int samples) override;
private:
static constexpr int m_level[8] = { 0, 33, 99, 231, 495, 1023, 2079, 4191 };
sound_stream *m_stream;
uint8_t m_chord; // 4-bit
uint8_t m_step; // 3-bit
bool m_sb;
};
// device type definition
DECLARE_DEVICE_TYPE(DAC76, dac76_device)
#endif // MAME_SOUND_DAC76_H
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