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funtech/supracan.cpp: preliminary cart interface, add NVRAM support f…
…or games requiring it
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,96 @@ | ||
| // license:BSD-3-Clause | ||
| // copyright-holders: | ||
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| #include "emu.h" | ||
| #include "rom.h" | ||
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| //------------------------------------------------- | ||
| // superacan_rom_device - constructor | ||
| //------------------------------------------------- | ||
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| DEFINE_DEVICE_TYPE(SUPERACAN_ROM_STD, superacan_rom_device, "superacan_rom", "Super A'Can Standard Cart") | ||
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| superacan_rom_device::superacan_rom_device(const machine_config &mconfig, device_type type, const char *tag, device_t *owner, u32 clock) | ||
| : device_t(mconfig, type, tag, owner, clock), device_superacan_cart_interface(mconfig, *this) | ||
| , m_rom_base(nullptr) | ||
| , m_nvram_base(nullptr) | ||
| , m_rom_size(0) | ||
| , m_nvram_size(0) | ||
| { | ||
| } | ||
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| superacan_rom_device::superacan_rom_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock) | ||
| : superacan_rom_device(mconfig, SUPERACAN_ROM_STD, tag, owner, clock) | ||
| { | ||
| } | ||
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| void superacan_rom_device::device_start() | ||
| { | ||
| } | ||
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| void superacan_rom_device::device_add_mconfig(machine_config &config) | ||
| { | ||
| // TODO: move UM6650 from funtech folder | ||
| } | ||
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| std::error_condition superacan_rom_device::load() | ||
| { | ||
| memory_region *const romregion = memregion("^rom"); | ||
| m_rom_base = reinterpret_cast<const u16 *>(romregion->base()); | ||
| m_rom_size = romregion->bytes() / 2; | ||
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| // if (m_rom_size > 0x40'0000) | ||
| // return std::make_pair(image_error::INVALIDLENGTH, "Unsupported cartridge size (must be no larger than 4M)"); | ||
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| memory_region *const nvramregion = memregion("^nvram"); | ||
| if (nvramregion) | ||
| { | ||
| m_nvram_base = reinterpret_cast<u8 *>(nvramregion->base()); | ||
| m_nvram_size = nvramregion->bytes(); | ||
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| if (m_nvram_size & (m_nvram_size - 1)) | ||
| return image_error::BADSOFTWARE; | ||
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| save_pointer(NAME(m_nvram_base), m_nvram_size); | ||
| battery_load(m_nvram_base, m_nvram_size, 0xff); | ||
| } | ||
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| return std::error_condition(); | ||
| } | ||
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| void superacan_rom_device::unload() | ||
| { | ||
| if (m_nvram_base) | ||
| battery_save(m_nvram_base, m_nvram_size); | ||
| } | ||
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| /*------------------------------------------------- | ||
| read/write | ||
| -------------------------------------------------*/ | ||
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| u16 superacan_rom_device::rom_r(offs_t offset) | ||
| { | ||
| if (offset < m_rom_size) | ||
| return m_rom_base[offset]; | ||
| else | ||
| return 0xffff; | ||
| } | ||
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| u8 superacan_rom_device::nvram_r(offs_t offset) | ||
| { | ||
| if (m_nvram_base) | ||
| return m_nvram_base[offset & (m_nvram_size - 1)]; | ||
| else | ||
| return 0xff; | ||
| } | ||
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| void superacan_rom_device::nvram_w(offs_t offset, u8 data) | ||
| { | ||
| if (m_nvram_base) | ||
| m_nvram_base[offset & (m_nvram_size - 1)] = data; | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,46 @@ | ||
| // license:BSD-3-Clause | ||
| // copyright-holders: | ||
| #ifndef MAME_BUS_SUPERACAN_ROM_H | ||
| #define MAME_BUS_SUPERACAN_ROM_H | ||
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| #pragma once | ||
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| #include "slot.h" | ||
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| // ======================> superacan_rom_device | ||
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| class superacan_rom_device : public device_t, | ||
| public device_superacan_cart_interface | ||
| { | ||
| public: | ||
| // construction/destruction | ||
| superacan_rom_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock); | ||
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| // load/unload | ||
| virtual std::error_condition load() override; | ||
| virtual void unload() override; | ||
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| // read/write | ||
| virtual u16 rom_r(offs_t offset) override; | ||
| virtual u8 nvram_r(offs_t offset) override; | ||
| virtual void nvram_w(offs_t offset, u8 data) override; | ||
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| protected: | ||
| superacan_rom_device(const machine_config &mconfig, device_type type, const char *tag, device_t *owner, u32 clock); | ||
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| virtual void device_start() override; | ||
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| virtual void device_add_mconfig(machine_config &config) override; | ||
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| private: | ||
| const u16 *m_rom_base; | ||
| u8 *m_nvram_base; | ||
| u32 m_rom_size; | ||
| u32 m_nvram_size; | ||
| }; | ||
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| DECLARE_DEVICE_TYPE(SUPERACAN_ROM_STD, superacan_rom_device) | ||
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| #endif // MAME_BUS_SUPERACAN_ROM_H |
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