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Diffstat (limited to 'src/devices/bus/msx_cart/halnote.cpp')
-rw-r--r--src/devices/bus/msx_cart/halnote.cpp159
1 files changed, 159 insertions, 0 deletions
diff --git a/src/devices/bus/msx_cart/halnote.cpp b/src/devices/bus/msx_cart/halnote.cpp
new file mode 100644
index 00000000000..35b0582b241
--- /dev/null
+++ b/src/devices/bus/msx_cart/halnote.cpp
@@ -0,0 +1,159 @@
+// license:BSD-3-Clause
+// copyright-holders:Wilbert Pol
+#include "emu.h"
+#include "halnote.h"
+
+
+const device_type MSX_CART_HALNOTE = &device_creator<msx_cart_halnote>;
+
+
+msx_cart_halnote::msx_cart_halnote(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock)
+ : device_t(mconfig, MSX_CART_HALNOTE, "MSX Cartridge - Halnote", tag, owner, clock, "msx_cart_halnote", __FILE__)
+ , msx_cart_interface(mconfig, *this)
+{
+ for (int i = 0; i < 8; i++)
+ {
+ m_selected_bank[i] = 0;
+ m_bank_base[i] = NULL;
+ }
+}
+
+
+void msx_cart_halnote::device_start()
+{
+ save_item(NAME(m_selected_bank));
+
+ machine().save().register_postload(save_prepost_delegate(FUNC(msx_cart_halnote::restore_banks), this));
+}
+
+
+void msx_cart_halnote::map_bank(int bank)
+{
+ if (bank < 2)
+ {
+ return;
+ }
+
+ // Special banks
+ if (bank == 6 || bank == 7)
+ {
+ m_bank_base[bank] = get_rom_base() + 0x80000 + (m_selected_bank[bank] * 0x800);
+ return;
+ }
+
+ m_bank_base[bank] = get_rom_base() + ((m_selected_bank[bank] * 0x2000) & 0xFFFFF);
+ if (bank == 2)
+ {
+ if (m_selected_bank[bank] & 0x80)
+ {
+ m_bank_base[0] = get_sram_base();
+ m_bank_base[1] = get_sram_base() + 0x2000;
+ }
+ else
+ {
+ m_bank_base[0] = NULL;
+ m_bank_base[1] = NULL;
+ }
+ }
+}
+
+
+void msx_cart_halnote::restore_banks()
+{
+ for (int i = 0; i < 8; i++)
+ {
+ map_bank(i);
+ }
+}
+
+
+void msx_cart_halnote::device_reset()
+{
+ for (int i = 0; i < 8; i++)
+ {
+ m_selected_bank[i] = 0;
+ }
+}
+
+
+void msx_cart_halnote::initialize_cartridge()
+{
+ if (get_rom_size() != 0x100000)
+ {
+ fatalerror("halnote: Invalid ROM size\n");
+ }
+
+ restore_banks();
+}
+
+
+READ8_MEMBER(msx_cart_halnote::read_cart)
+{
+ if (offset >= 0xc000)
+ {
+ return 0xFF;
+ }
+
+ if ((offset & 0xf000) == 0x7000 && (m_selected_bank[3] & 0x80))
+ {
+ return m_bank_base[6 + ((offset >> 11) & 0x01)][offset & 0x7ff];
+ }
+
+ const UINT8 *mem = m_bank_base[offset >> 13];
+
+ if (mem)
+ {
+ return mem[offset & 0x1fff];
+ }
+ return 0xff;
+}
+
+
+WRITE8_MEMBER(msx_cart_halnote::write_cart)
+{
+ if (offset < 0x4000)
+ {
+ if (m_bank_base[0] != NULL)
+ {
+ m_sram[offset & 0x3fff] = data;
+ return;
+ }
+ }
+
+ switch (offset)
+ {
+ case 0x4FFF:
+ m_selected_bank[2] = data;
+ map_bank(2);
+ break;
+
+ case 0x6FFF: // 6000-7FFF
+ m_selected_bank[3] = data;
+ map_bank(3);
+ break;
+
+ case 0x77FF:
+ m_selected_bank[6] = data;
+ map_bank(6);
+ break;
+
+ case 0x7FFF:
+ m_selected_bank[7] = data;
+ map_bank(7);
+ break;
+
+ case 0x8FFF:
+ m_selected_bank[4] = data;
+ map_bank(4);
+ break;
+
+ case 0xAFFF:
+ m_selected_bank[5] = data;
+ map_bank(5);
+ break;
+
+ default:
+ logerror("msx_cart_halnote: Unhandled write %02x to %04x\n", data, offset);
+ break;
+ }
+}