diff options
Diffstat (limited to 'src/devices/bus/a2bus/a2alfam2.c')
-rw-r--r-- | src/devices/bus/a2bus/a2alfam2.c | 181 |
1 files changed, 181 insertions, 0 deletions
diff --git a/src/devices/bus/a2bus/a2alfam2.c b/src/devices/bus/a2bus/a2alfam2.c new file mode 100644 index 00000000000..3a35c8ab253 --- /dev/null +++ b/src/devices/bus/a2bus/a2alfam2.c @@ -0,0 +1,181 @@ +// license:BSD-3-Clause +// copyright-holders:R. Belmont +/********************************************************************* + + a2alfsm2.c + + Implementation of the ALF Apple Music II card (originally marketed as the "MC1") + The AE Super Music Synthesizer is a superset of this card (4x76489 instead of 3) + +*********************************************************************/ + +#include "a2alfam2.h" +#include "includes/apple2.h" +#include "sound/sn76496.h" + +/*************************************************************************** + PARAMETERS +***************************************************************************/ + +//************************************************************************** +// GLOBAL VARIABLES +//************************************************************************** + +const device_type A2BUS_ALFAM2 = &device_creator<a2bus_alfam2_device>; +const device_type A2BUS_AESMS = &device_creator<a2bus_aesms_device>; + +#define SN1_TAG "sn76489_1" // left +#define SN2_TAG "sn76489_2" // center +#define SN3_TAG "sn76489_3" // right +#define SN4_TAG "sn76489_4" // center? + +MACHINE_CONFIG_FRAGMENT( a2alfam2 ) + MCFG_SPEAKER_STANDARD_STEREO("alf_l", "alf_r") + + MCFG_SOUND_ADD(SN1_TAG, SN76489, 1020484) + MCFG_SOUND_ROUTE(ALL_OUTPUTS, "alf_l", 0.50) + MCFG_SOUND_ADD(SN2_TAG, SN76489, 1020484) + MCFG_SOUND_ROUTE(ALL_OUTPUTS, "alf_l", 0.50) + MCFG_SOUND_ROUTE(ALL_OUTPUTS, "alf_r", 0.50) + MCFG_SOUND_ADD(SN3_TAG, SN76489, 1020484) + MCFG_SOUND_ROUTE(ALL_OUTPUTS, "alf_r", 0.50) +MACHINE_CONFIG_END + +MACHINE_CONFIG_FRAGMENT( a2aesms ) + MCFG_SPEAKER_STANDARD_STEREO("alf_l", "alf_r") + + MCFG_SOUND_ADD(SN1_TAG, SN76489, 1020484) + MCFG_SOUND_ROUTE(ALL_OUTPUTS, "alf_l", 0.50) + + MCFG_SOUND_ADD(SN2_TAG, SN76489, 1020484) + MCFG_SOUND_ROUTE(ALL_OUTPUTS, "alf_l", 0.50) + MCFG_SOUND_ROUTE(ALL_OUTPUTS, "alf_r", 0.50) + + MCFG_SOUND_ADD(SN3_TAG, SN76489, 1020484) + MCFG_SOUND_ROUTE(ALL_OUTPUTS, "alf_r", 0.50) + + MCFG_SOUND_ADD(SN4_TAG, SN76489, 1020484) + MCFG_SOUND_ROUTE(ALL_OUTPUTS, "alf_l", 0.50) + MCFG_SOUND_ROUTE(ALL_OUTPUTS, "alf_r", 0.50) +MACHINE_CONFIG_END + +/*************************************************************************** + FUNCTION PROTOTYPES +***************************************************************************/ + +//------------------------------------------------- +// machine_config_additions - device-specific +// machine configurations +//------------------------------------------------- + +machine_config_constructor a2bus_sn76489_device::device_mconfig_additions() const +{ + return MACHINE_CONFIG_NAME( a2alfam2 ); +} + +machine_config_constructor a2bus_aesms_device::device_mconfig_additions() const +{ + return MACHINE_CONFIG_NAME( a2aesms ); +} + +//************************************************************************** +// LIVE DEVICE +//************************************************************************** + +a2bus_sn76489_device::a2bus_sn76489_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) : + device_t(mconfig, type, name, tag, owner, clock, shortname, source), + device_a2bus_card_interface(mconfig, *this), + m_sn1(*this, SN1_TAG), + m_sn2(*this, SN2_TAG), + m_sn3(*this, SN3_TAG), + m_sn4(*this, SN4_TAG) +{ +} + +a2bus_alfam2_device::a2bus_alfam2_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock) : + a2bus_sn76489_device(mconfig, A2BUS_ALFAM2, "ALF MC1 / Apple Music II", tag, owner, clock, "a2alfam2", __FILE__) +{ + m_has4thsn = false; +} + +a2bus_aesms_device::a2bus_aesms_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock) : + a2bus_sn76489_device(mconfig, A2BUS_ALFAM2, "Applied Engineering Super Music Synthesizer", tag, owner, clock, "a2aesms", __FILE__) +{ + m_has4thsn = true; +} + +//------------------------------------------------- +// device_start - device-specific startup +//------------------------------------------------- + +void a2bus_sn76489_device::device_start() +{ + // set_a2bus_device makes m_slot valid + set_a2bus_device(); + m_latch0 = m_latch1 = m_latch2 = m_latch3 = 0; + + save_item(NAME(m_latch0)); + save_item(NAME(m_latch1)); + save_item(NAME(m_latch2)); + save_item(NAME(m_latch3)); +} + +void a2bus_sn76489_device::device_reset() +{ + m_latch0 = m_latch1 = m_latch2 = m_latch3 = 0; +} + +UINT8 a2bus_sn76489_device::read_c0nx(address_space &space, UINT8 offset) +{ + // SN76489 can't be read, it appears from the schematics this is what happens + switch (offset) + { + case 0: + return m_latch0; + + case 1: + return m_latch1; + + case 2: + return m_latch2; + + case 3: + return m_latch3; + } + + return 0xff; +} + +void a2bus_sn76489_device::write_c0nx(address_space &space, UINT8 offset, UINT8 data) +{ + switch (offset) + { + case 0: + m_sn1->write(space, 0, data); + m_latch0 = data; + break; + + case 1: + m_sn2->write(space, 0, data); + m_latch1 = data; + break; + + case 2: + m_sn3->write(space, 0, data); + m_latch2 = data; + break; + + case 3: + if (m_has4thsn) + { + m_sn4->write(space, 0, data); + m_latch3 = data; + } + break; + } +} + +bool a2bus_sn76489_device::take_c800() +{ + return false; +} |