mirror of
https://github.com/holub/mame
synced 2025-06-04 20:06:28 +03:00
149 lines
4.0 KiB
C
149 lines
4.0 KiB
C
/*********************************************************************
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a2alfsm2.c
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Implementation of the ALF Apple Music II card (originally marketed as the "MC1")
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*********************************************************************/
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#include "a2alfam2.h"
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#include "includes/apple2.h"
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#include "sound/sn76496.h"
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/***************************************************************************
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PARAMETERS
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***************************************************************************/
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//**************************************************************************
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// GLOBAL VARIABLES
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//**************************************************************************
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const device_type A2BUS_ALFAM2 = &device_creator<a2bus_alfam2_device>;
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#define SN1_TAG "sn76489_1" // left
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#define SN2_TAG "sn76489_2" // center
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#define SN3_TAG "sn76489_3" // right
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//-------------------------------------------------
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// sn76496_config psg_intf
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//-------------------------------------------------
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static const sn76496_config psg_intf =
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{
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DEVCB_NULL
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};
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MACHINE_CONFIG_FRAGMENT( a2alfam2 )
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MCFG_SPEAKER_STANDARD_STEREO("alf_l", "alf_r")
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MCFG_SOUND_ADD(SN1_TAG, SN76489, 1020484)
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MCFG_SOUND_CONFIG(psg_intf)
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MCFG_SOUND_ROUTE(ALL_OUTPUTS, "alf_l", 0.50)
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MCFG_SOUND_ADD(SN2_TAG, SN76489, 1020484)
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MCFG_SOUND_CONFIG(psg_intf)
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MCFG_SOUND_ROUTE(ALL_OUTPUTS, "alf_l", 0.50)
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MCFG_SOUND_ROUTE(ALL_OUTPUTS, "alf_r", 0.50)
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MCFG_SOUND_ADD(SN3_TAG, SN76489, 1020484)
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MCFG_SOUND_CONFIG(psg_intf)
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MCFG_SOUND_ROUTE(ALL_OUTPUTS, "alf_r", 0.50)
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MACHINE_CONFIG_END
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/***************************************************************************
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FUNCTION PROTOTYPES
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***************************************************************************/
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//-------------------------------------------------
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// machine_config_additions - device-specific
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// machine configurations
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//-------------------------------------------------
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machine_config_constructor a2bus_alfam2_device::device_mconfig_additions() const
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{
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return MACHINE_CONFIG_NAME( a2alfam2 );
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}
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//**************************************************************************
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// LIVE DEVICE
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//**************************************************************************
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a2bus_alfam2_device::a2bus_alfam2_device(const machine_config &mconfig, device_type type, const char *name, const char *tag, device_t *owner, UINT32 clock, const char *shortname, const char *source) :
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device_t(mconfig, type, name, tag, owner, clock, shortname, source),
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device_a2bus_card_interface(mconfig, *this),
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m_sn1(*this, SN1_TAG),
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m_sn2(*this, SN2_TAG),
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m_sn3(*this, SN3_TAG)
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{
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}
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a2bus_alfam2_device::a2bus_alfam2_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock) :
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device_t(mconfig, A2BUS_ALFAM2, "ALF MC1 / Apple Music II", tag, owner, clock, "a2alfam2", __FILE__),
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device_a2bus_card_interface(mconfig, *this),
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m_sn1(*this, SN1_TAG),
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m_sn2(*this, SN2_TAG),
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m_sn3(*this, SN3_TAG)
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{
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}
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//-------------------------------------------------
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// device_start - device-specific startup
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//-------------------------------------------------
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void a2bus_alfam2_device::device_start()
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{
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// set_a2bus_device makes m_slot valid
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set_a2bus_device();
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m_latch0 = m_latch1 = m_latch2 = 0;
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save_item(NAME(m_latch0));
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save_item(NAME(m_latch1));
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save_item(NAME(m_latch2));
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}
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void a2bus_alfam2_device::device_reset()
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{
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m_latch0 = m_latch1 = m_latch2 = 0;
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}
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UINT8 a2bus_alfam2_device::read_c0nx(address_space &space, UINT8 offset)
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{
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// SN76489 can't be read, it appears from the schematics this is what happens
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switch (offset)
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{
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case 0:
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return m_latch0;
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case 1:
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return m_latch1;
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case 2:
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return m_latch2;
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}
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return 0xff;
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}
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void a2bus_alfam2_device::write_c0nx(address_space &space, UINT8 offset, UINT8 data)
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{
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switch (offset)
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{
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case 0:
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m_sn1->write(space, 0, data);
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m_latch0 = data;
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break;
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case 1:
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m_sn2->write(space, 0, data);
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m_latch1 = data;
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break;
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case 2:
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m_sn3->write(space, 0, data);
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m_latch2 = data;
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break;
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}
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}
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bool a2bus_alfam2_device::take_c800()
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{
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return false;
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}
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