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Diffstat (limited to 'src/devices/bus/msx_cart/fmpac.cpp')
-rw-r--r--src/devices/bus/msx_cart/fmpac.cpp173
1 files changed, 173 insertions, 0 deletions
diff --git a/src/devices/bus/msx_cart/fmpac.cpp b/src/devices/bus/msx_cart/fmpac.cpp
new file mode 100644
index 00000000000..c4222094c1a
--- /dev/null
+++ b/src/devices/bus/msx_cart/fmpac.cpp
@@ -0,0 +1,173 @@
+// license:BSD-3-Clause
+// copyright-holders:Wilbert Pol
+/**********************************************************************************
+
+When backing up the SRAM from an FM-PAC the file seems to be prefixed
+with: PAC2 BACKUP DATA. We only store the raw sram contents.
+
+**********************************************************************************/
+
+#include "emu.h"
+#include "fmpac.h"
+
+const device_type MSX_CART_FMPAC = &device_creator<msx_cart_fmpac>;
+
+
+msx_cart_fmpac::msx_cart_fmpac(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock)
+ : device_t(mconfig, MSX_CART_FMPAC, "MSX Cartridge - FM-PAC", tag, owner, clock, "msx_cart_fmpac", __FILE__)
+ , msx_cart_interface(mconfig, *this)
+ , m_ym2413(*this, "ym2413")
+ , m_selected_bank(0)
+ , m_bank_base(NULL)
+ , m_sram_active(false)
+ , m_opll_active(false)
+ , m_1ffe(0)
+ , m_1fff(0)
+ , m_7ff6(0)
+{
+}
+
+
+static MACHINE_CONFIG_FRAGMENT( fmpac )
+ // This is actually incorrect. The sound output is passed back into the MSX machine where it is mixed internally and output through the system 'speaker'.
+ MCFG_SPEAKER_STANDARD_MONO("mono")
+ MCFG_SOUND_ADD("ym2413", YM2413, XTAL_10_738635MHz/3)
+ MCFG_SOUND_ROUTE(ALL_OUTPUTS, "mono", 0.40)
+MACHINE_CONFIG_END
+
+
+machine_config_constructor msx_cart_fmpac::device_mconfig_additions() const
+{
+ return MACHINE_CONFIG_NAME( fmpac );
+}
+
+
+void msx_cart_fmpac::device_start()
+{
+ save_item(NAME(m_selected_bank));
+ save_item(NAME(m_sram_active));
+ save_item(NAME(m_opll_active));
+ save_item(NAME(m_1ffe));
+ save_item(NAME(m_1fff));
+ save_item(NAME(m_7ff6));
+
+ machine().save().register_postload(save_prepost_delegate(FUNC(msx_cart_fmpac::restore_banks), this));
+
+ // Install IO read/write handlers
+ address_space &space = machine().device<cpu_device>("maincpu")->space(AS_IO);
+ space.install_write_handler(0x7c, 0x7d, write8_delegate(FUNC(msx_cart_fmpac::write_ym2413), this));
+}
+
+
+void msx_cart_fmpac::restore_banks()
+{
+ m_bank_base = get_rom_base() + ( m_selected_bank & 0x03 ) * 0x4000;
+}
+
+
+void msx_cart_fmpac::device_reset()
+{
+ m_selected_bank = 0;
+ m_sram_active = false;
+ m_opll_active = false;
+ m_1ffe = 0;
+ m_1fff = 0;
+ m_7ff6 = 0;
+}
+
+
+void msx_cart_fmpac::initialize_cartridge()
+{
+ if ( get_rom_size() != 0x10000 )
+ {
+ fatalerror("fmpac: Invalid ROM size\n");
+ }
+
+ if ( get_sram_size() != 0x2000 )
+ {
+ fatalerror("fmpac: Invalid SRAM size\n");
+ }
+
+ restore_banks();
+}
+
+
+READ8_MEMBER(msx_cart_fmpac::read_cart)
+{
+ if (offset >= 0x4000 && offset < 0x8000)
+ {
+ if (offset == 0x7ff6)
+ {
+ return m_7ff6;
+ }
+ if (offset == 0x7ff7)
+ {
+ return m_selected_bank & 0x03;
+ }
+ if (m_sram_active)
+ {
+ if (offset & 0x2000)
+ {
+ return 0xff;
+ }
+ return get_sram_base()[offset & 0x1fff];
+ }
+ else
+ {
+ return m_bank_base[offset & 0x3fff];
+ }
+ }
+ return 0xff;
+}
+
+
+WRITE8_MEMBER(msx_cart_fmpac::write_cart)
+{
+ if (offset >= 0x4000 && offset < 0x6000)
+ {
+ if (m_sram_active)
+ {
+ get_sram_base()[offset & 0x1fff] = data;
+ }
+ if (offset == 0x5ffe)
+ {
+ m_1ffe = data;
+ }
+ if (offset == 0x5fff)
+ {
+ m_1fff = data;
+ }
+ m_sram_active = (m_1ffe == 0x4d) && (m_1fff == 0x69);
+ }
+
+ switch (offset)
+ {
+ case 0x7ff4:
+ case 0x7ff5:
+ if (m_opll_active)
+ {
+ m_ym2413->write(space, offset & 1, data);
+ }
+ break;
+
+ case 0x7ff6:
+ m_7ff6 = data & 0x11;
+ m_opll_active = (m_7ff6 & 0x01);
+ break;
+
+ case 0x7ff7:
+ m_selected_bank = data;
+ restore_banks();
+ break;
+ }
+
+}
+
+
+WRITE8_MEMBER(msx_cart_fmpac::write_ym2413)
+{
+ if (m_opll_active)
+ {
+ m_ym2413->write(space, offset & 1, data);
+ }
+}