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Diffstat (limited to 'src/devices/bus/a2bus/prodosromdrive.cpp')
-rw-r--r-- | src/devices/bus/a2bus/prodosromdrive.cpp | 119 |
1 files changed, 119 insertions, 0 deletions
diff --git a/src/devices/bus/a2bus/prodosromdrive.cpp b/src/devices/bus/a2bus/prodosromdrive.cpp new file mode 100644 index 00000000000..d9275384a00 --- /dev/null +++ b/src/devices/bus/a2bus/prodosromdrive.cpp @@ -0,0 +1,119 @@ +// license:BSD-3-Clause +// copyright-holders:R. Belmont +/********************************************************************* + + prodosromdrive.cpp + + Implementation of the ProDOS ROM Drive card + + This is a hobbyist board which provides a minimal SmartPort API + interface to boot from a 1 MiB disk image stored in a 27C080 or + compatible EPROM. + + Board and firmware by Terence J. Boldt + http://apple2.ca/ + https://github.com/tjboldt/ProDOS-ROM-Drive + + The firmware requires a IIe or better, and some of the games + included require a 65C02 (enhanced IIe). + +*********************************************************************/ + +#include "emu.h" +#include "prodosromdrive.h" + +namespace { + +//************************************************************************** +// TYPE DEFINITIONS +//************************************************************************** + +class a2bus_pdromdrive_device : public device_t, + public device_a2bus_card_interface +{ +public: + // construction/destruction + a2bus_pdromdrive_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock); + +protected: + a2bus_pdromdrive_device(const machine_config &mconfig, device_type type, const char *tag, device_t *owner, uint32_t clock); + + virtual void device_start() override; + virtual const tiny_rom_entry *device_rom_region() const override; + + // overrides of standard a2bus slot functions + virtual uint8_t read_c0nx(uint8_t offset) override; + virtual void write_c0nx(uint8_t offset, uint8_t data) override; + virtual uint8_t read_cnxx(uint8_t offset) override; + +private: + required_region_ptr<u8> m_rom; + + u16 m_latch; +}; + +//************************************************************************** +// LIVE DEVICE +//************************************************************************** + +a2bus_pdromdrive_device::a2bus_pdromdrive_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) : + a2bus_pdromdrive_device(mconfig, A2BUS_PRODOSROMDRIVE, tag, owner, clock) +{ +} + +a2bus_pdromdrive_device::a2bus_pdromdrive_device(const machine_config &mconfig, device_type type, const char *tag, device_t *owner, uint32_t clock) : + device_t(mconfig, type, tag, owner, clock), + device_a2bus_card_interface(mconfig, *this), + m_rom(*this, "romdrive") +{ +} + +void a2bus_pdromdrive_device::device_start() +{ + save_item(NAME(m_latch)); +} + +ROM_START( pdromdrive ) + ROM_REGION(0x100000, "romdrive", 0) + ROM_LOAD( "gameswithfirmware.bin", 0x000000, 0x100000, CRC(a1efd23b) SHA1(f0733b7a68126adc5247a1008de2ea4f65ad645a) ) +ROM_END + +const tiny_rom_entry *a2bus_pdromdrive_device::device_rom_region() const +{ + return ROM_NAME(pdromdrive); +} + +uint8_t a2bus_pdromdrive_device::read_c0nx(uint8_t offset) +{ + return m_rom[(m_latch << 4) | (offset & 0xf)]; +} + +void a2bus_pdromdrive_device::write_c0nx(uint8_t offset, uint8_t data) +{ + switch (offset) + { + case 0: + m_latch &= 0xff00; + m_latch |= data; + break; + + case 1: + m_latch &= 0x00ff; + m_latch |= (data << 8); + break; + } +} + +uint8_t a2bus_pdromdrive_device::read_cnxx(uint8_t offset) +{ + return m_rom[offset + 0x300]; +} + +} // anonymous namespace + + +//************************************************************************** +// GLOBAL VARIABLES +//************************************************************************** + +DEFINE_DEVICE_TYPE_PRIVATE(A2BUS_PRODOSROMDRIVE, device_a2bus_card_interface, a2bus_pdromdrive_device, "a2pdromdr", "ProDOS ROM Drive") |