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-rw-r--r--src/devices/bus/a2bus/a2alfam2.c181
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;
+}