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-rw-r--r--src/devices/bus/a2bus/a2arcadebd.c149
1 files changed, 149 insertions, 0 deletions
diff --git a/src/devices/bus/a2bus/a2arcadebd.c b/src/devices/bus/a2bus/a2arcadebd.c
new file mode 100644
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+++ b/src/devices/bus/a2bus/a2arcadebd.c
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+// license:BSD-3-Clause
+// copyright-holders:R. Belmont
+/*********************************************************************
+
+ a2arcadeboard.c
+
+ Implementation of the Third Millenium Engineering Arcade Board
+
+ TODO:
+ - VDPTEST program seems to want more than 16K of RAM, but docs/ads/press releases say 16k, period
+ - MLDEMO program needs vsync IRQ from the TMS but doesn't program the registers the way our emulation
+ wants to enable IRQs
+
+*********************************************************************/
+
+#include "emu.h"
+#include "a2arcadebd.h"
+
+
+/***************************************************************************
+ PARAMETERS
+***************************************************************************/
+
+#define TMS_TAG "arcbd_tms"
+#define AY_TAG "arcbd_ay"
+#define SCREEN_TAG "screen"
+
+//**************************************************************************
+// GLOBAL VARIABLES
+//**************************************************************************
+
+const device_type A2BUS_ARCADEBOARD = &device_creator<a2bus_arcboard_device>;
+
+MACHINE_CONFIG_FRAGMENT( arcadeboard )
+ MCFG_DEVICE_ADD( TMS_TAG, TMS9918A, XTAL_10_738635MHz / 2 )
+ MCFG_TMS9928A_VRAM_SIZE(0x4000) // 16k of VRAM
+ MCFG_TMS9928A_OUT_INT_LINE_CB(WRITELINE(a2bus_arcboard_device, tms_irq_w))
+ MCFG_TMS9928A_SCREEN_ADD_NTSC( SCREEN_TAG )
+ MCFG_SCREEN_UPDATE_DEVICE( TMS_TAG, tms9918a_device, screen_update )
+
+ MCFG_SPEAKER_STANDARD_MONO("mono")
+ MCFG_SOUND_ADD(AY_TAG, AY8910, 1022727)
+ MCFG_SOUND_ROUTE(ALL_OUTPUTS, "mono", 1.0)
+MACHINE_CONFIG_END
+
+//-------------------------------------------------
+// machine_config_additions - device-specific
+// machine configurations
+//-------------------------------------------------
+
+machine_config_constructor a2bus_arcboard_device::device_mconfig_additions() const
+{
+ return MACHINE_CONFIG_NAME( arcadeboard );
+}
+
+//**************************************************************************
+// LIVE DEVICE
+//**************************************************************************
+
+a2bus_arcboard_device::a2bus_arcboard_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock) :
+ device_t(mconfig, A2BUS_ARCADEBOARD, "Third Millenium Engineering Arcade Board", tag, owner, clock, "a2arcbd", __FILE__),
+ device_a2bus_card_interface(mconfig, *this),
+ m_tms(*this, TMS_TAG),
+ m_ay(*this, AY_TAG)
+{
+}
+
+a2bus_arcboard_device::a2bus_arcboard_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_tms(*this, TMS_TAG),
+ m_ay(*this, AY_TAG)
+{
+}
+
+//-------------------------------------------------
+// device_start - device-specific startup
+//-------------------------------------------------
+
+void a2bus_arcboard_device::device_start()
+{
+ // set_a2bus_device makes m_slot valid
+ set_a2bus_device();
+}
+
+void a2bus_arcboard_device::device_reset()
+{
+}
+
+/*
+ C0nx map:
+ 0 - TMS read vram
+ 1 - TMS read status
+ 2 - TMS write vram
+ 3 - TMS write register
+ 5 - AY register select
+ 6 - AY data
+*/
+
+UINT8 a2bus_arcboard_device::read_c0nx(address_space &space, UINT8 offset)
+{
+ switch (offset)
+ {
+ case 0:
+ return m_tms->vram_read(space, 0);
+
+ case 1:
+ return m_tms->register_read(space, 0);
+
+ case 6:
+ return m_ay->data_r(space, 0);
+ }
+
+ return 0xff;
+}
+
+void a2bus_arcboard_device::write_c0nx(address_space &space, UINT8 offset, UINT8 data)
+{
+ switch (offset)
+ {
+ case 2:
+ m_tms->vram_write(space, 0, data);
+ break;
+
+ case 3:
+ m_tms->register_write(space, 0, data);
+ break;
+
+ case 5:
+ m_ay->address_w(space, 0, data);
+ break;
+
+ case 6:
+ m_ay->data_w(space, 0, data);
+ break;
+ }
+}
+
+WRITE_LINE_MEMBER( a2bus_arcboard_device::tms_irq_w )
+{
+ if (state)
+ {
+ raise_slot_irq();
+ }
+ else
+ {
+ lower_slot_irq();
+ }
+}