diff options
Diffstat (limited to 'src/devices/bus/msx_cart/halnote.cpp')
-rw-r--r-- | src/devices/bus/msx_cart/halnote.cpp | 159 |
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; + } +} |