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Diffstat (limited to 'src/emu/bus/msx_cart/rtype.c')
-rw-r--r--src/emu/bus/msx_cart/rtype.c77
1 files changed, 77 insertions, 0 deletions
diff --git a/src/emu/bus/msx_cart/rtype.c b/src/emu/bus/msx_cart/rtype.c
new file mode 100644
index 00000000000..25c1ec18f89
--- /dev/null
+++ b/src/emu/bus/msx_cart/rtype.c
@@ -0,0 +1,77 @@
+#include "emu.h"
+#include "rtype.h"
+
+const device_type MSX_CART_RTYPE = &device_creator<msx_cart_rtype>;
+
+
+msx_cart_rtype::msx_cart_rtype(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock)
+ : device_t(mconfig, MSX_CART_RTYPE, "MSX Cartridge - R-Type", tag, owner, clock, "msx_cart_rtype", __FILE__)
+ , msx_cart_interface(mconfig, *this)
+ , m_selected_bank(0)
+{
+ for (int i = 0; i < 2; i++)
+ {
+ m_bank_base[i] = NULL;
+ }
+}
+
+
+void msx_cart_rtype::device_start()
+{
+ save_item(NAME(m_selected_bank));
+
+ machine().save().register_postload(save_prepost_delegate(FUNC(msx_cart_rtype::restore_banks), this));
+}
+
+
+void msx_cart_rtype::restore_banks()
+{
+ m_bank_base[0] = get_rom_base() + 15 * 0x4000;
+ if (m_selected_bank & 0x10)
+ {
+ m_selected_bank &= 0x17;
+ }
+ m_bank_base[1] = get_rom_base() + m_selected_bank * 0x4000;
+}
+
+
+void msx_cart_rtype::device_reset()
+{
+ m_selected_bank = 15;
+}
+
+
+void msx_cart_rtype::initialize_cartridge()
+{
+ if ( get_rom_size() != 0x80000 && get_rom_size() != 0x60000 )
+ {
+ fatalerror("rtype: Invalid ROM size\n");
+ }
+
+ restore_banks();
+}
+
+
+READ8_MEMBER(msx_cart_rtype::read_cart)
+{
+ if (offset >= 0x4000 && offset < 0xc000)
+ {
+ return m_bank_base[offset >> 15][offset & 0x3fff];
+ }
+ return 0xff;
+}
+
+
+WRITE8_MEMBER(msx_cart_rtype::write_cart)
+{
+ if (offset >= 0x7000 && offset < 0x8000)
+ {
+ m_selected_bank = data & 0x1f;
+ if (m_selected_bank & 0x10)
+ {
+ m_selected_bank &= 0x17;
+ }
+ m_bank_base[1] = get_rom_base() + m_selected_bank * 0x4000;
+ }
+}
+