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// license:BSD-3-Clause
// copyright-holders:R. Belmont
/*********************************************************************
a2midi.c
Apple II 6850 MIDI card, as made by Passport, Yamaha, and others.
*********************************************************************/
#include "emu.h"
#include "a2midi.h"
#include "bus/midi/midi.h"
#include "machine/6840ptm.h"
#include "machine/6850acia.h"
#include "machine/clock.h"
namespace {
/***************************************************************************
PARAMETERS
***************************************************************************/
#define MIDI_PTM_TAG "midi_ptm"
#define MIDI_ACIA_TAG "midi_acia"
//**************************************************************************
// TYPE DEFINITIONS
//**************************************************************************
class a2bus_midi_device:
public device_t,
public device_a2bus_card_interface
{
public:
// construction/destruction
a2bus_midi_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock);
protected:
a2bus_midi_device(const machine_config &mconfig, device_type type, const char *tag, device_t *owner, uint32_t clock);
virtual void device_start() override;
virtual void device_reset() override;
virtual void device_add_mconfig(machine_config &config) override;
virtual uint8_t read_c0nx(uint8_t offset) override;
virtual void write_c0nx(uint8_t offset, uint8_t data) override;
required_device<ptm6840_device> m_ptm;
required_device<acia6850_device> m_acia;
private:
DECLARE_WRITE_LINE_MEMBER( acia_irq_w );
DECLARE_WRITE_LINE_MEMBER( ptm_irq_w );
DECLARE_WRITE_LINE_MEMBER( write_acia_clock );
bool m_acia_irq, m_ptm_irq;
};
//-------------------------------------------------
// device_add_mconfig - add device configuration
//-------------------------------------------------
void a2bus_midi_device::device_add_mconfig(machine_config &config)
{
PTM6840(config, m_ptm, 1021800);
m_ptm->set_external_clocks(1021800.0f, 1021800.0f, 1021800.0f);
m_ptm->irq_callback().set(FUNC(a2bus_midi_device::ptm_irq_w));
ACIA6850(config, m_acia, 0);
m_acia->txd_handler().set("mdout", FUNC(midi_port_device::write_txd));
m_acia->irq_handler().set(FUNC(a2bus_midi_device::acia_irq_w));
MIDI_PORT(config, "mdin", midiin_slot, "midiin").rxd_handler().set(m_acia, FUNC(acia6850_device::write_rxd));
MIDI_PORT(config, "mdout", midiout_slot, "midiout");
clock_device &acia_clock(CLOCK(config, "acia_clock", 31250*16));
acia_clock.signal_handler().set(FUNC(a2bus_midi_device::write_acia_clock));
}
//**************************************************************************
// LIVE DEVICE
//**************************************************************************
a2bus_midi_device::a2bus_midi_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) :
a2bus_midi_device(mconfig, A2BUS_MIDI, tag, owner, clock)
{
}
a2bus_midi_device::a2bus_midi_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_ptm(*this, MIDI_PTM_TAG),
m_acia(*this, MIDI_ACIA_TAG), m_acia_irq(false),
m_ptm_irq(false)
{
}
//-------------------------------------------------
// device_start - device-specific startup
//-------------------------------------------------
void a2bus_midi_device::device_start()
{
}
void a2bus_midi_device::device_reset()
{
m_acia_irq = m_ptm_irq = false;
}
/*-------------------------------------------------
read_c0nx - called for reads from this card's c0nx space
-------------------------------------------------*/
uint8_t a2bus_midi_device::read_c0nx(uint8_t offset)
{
// PTM at C0n0-C0n7, ACIA at C0n8-C0n9, drum sync (?) at C0nA-C0nB
if (offset < 8)
{
return m_ptm->read(offset & 7);
}
else if (offset == 8 || offset == 9)
{
return m_acia->read(offset & 1);
}
return 0;
}
/*-------------------------------------------------
write_c0nx - called for writes to this card's c0nx space
-------------------------------------------------*/
void a2bus_midi_device::write_c0nx(uint8_t offset, uint8_t data)
{
if (offset < 8)
{
m_ptm->write(offset & 7, data);
}
else if (offset == 8 || offset == 9)
{
m_acia->write(offset & 1, data);
}
}
WRITE_LINE_MEMBER( a2bus_midi_device::acia_irq_w )
{
m_acia_irq = state ? true : false;
if (m_acia_irq || m_ptm_irq)
{
raise_slot_irq();
}
else
{
lower_slot_irq();
}
}
WRITE_LINE_MEMBER( a2bus_midi_device::ptm_irq_w )
{
m_acia_irq = state ? true : false;
if (m_acia_irq || m_ptm_irq)
{
raise_slot_irq();
}
else
{
lower_slot_irq();
}
}
WRITE_LINE_MEMBER( a2bus_midi_device::write_acia_clock )
{
m_acia->write_txc(state);
m_acia->write_rxc(state);
}
} // anonymous namespace
//**************************************************************************
// GLOBAL VARIABLES
//**************************************************************************
DEFINE_DEVICE_TYPE_PRIVATE(A2BUS_MIDI, device_a2bus_card_interface, a2bus_midi_device, "a2midi", "6850 MIDI card")
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