// license:BSD-3-Clause // copyright-holders:R. Belmont /********************************************************************* a2swyft.c Implementation of the IAI SwyftCard *********************************************************************/ #include "emu.h" #include "a2swyft.h" namespace { /*************************************************************************** PARAMETERS ***************************************************************************/ #define SWYFT_ROM_REGION "swyft_rom" ROM_START( swyft ) ROM_REGION(0x4000, SWYFT_ROM_REGION, 0) ROM_LOAD( "840-003a.bin", 0x000000, 0x004000, CRC(5d6673e9) SHA1(1554bd03c536789f0ff7d1ef6c992265e311935d) ) ROM_REGION(0x1000, "pal16r4", 0) ROM_LOAD( "swyft_pal16r4.jed", 0x0000, 0x08EF, CRC(462a6938) SHA1(38be885539cf91423a246378c411ac8b2f150ec6) ) // swyft3.pal derived by D. Elvey, works as a replacement pal (original is protected?) ROM_END //************************************************************************** // TYPE DEFINITIONS //************************************************************************** class a2bus_swyft_device: public device_t, public device_a2bus_card_interface { public: // construction/destruction a2bus_swyft_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock); virtual const tiny_rom_entry *device_rom_region() const override ATTR_COLD; protected: a2bus_swyft_device(const machine_config &mconfig, device_type type, const char *tag, device_t *owner, uint32_t clock); virtual void device_start() override ATTR_COLD; virtual void device_reset() override ATTR_COLD; virtual uint8_t read_c0nx(uint8_t offset) override; virtual void write_c0nx(uint8_t offset, uint8_t data) override; virtual uint8_t read_inh_rom(uint16_t offset) override; virtual uint16_t inh_start() override { return 0xd000; } virtual uint16_t inh_end() override { return 0xffff; } virtual int inh_type() override; private: required_region_ptr m_rom; int m_rombank = 0; int m_inh_state = 0; }; //------------------------------------------------- // rom_region - device-specific ROM region //------------------------------------------------- const tiny_rom_entry *a2bus_swyft_device::device_rom_region() const { return ROM_NAME( swyft ); } //************************************************************************** // LIVE DEVICE //************************************************************************** a2bus_swyft_device::a2bus_swyft_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) : a2bus_swyft_device(mconfig, A2BUS_SWYFT, tag, owner, clock) { } a2bus_swyft_device::a2bus_swyft_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, SWYFT_ROM_REGION) { } //------------------------------------------------- // device_start - device-specific startup //------------------------------------------------- void a2bus_swyft_device::device_start() { save_item(NAME(m_rombank)); } void a2bus_swyft_device::device_reset() { m_rombank = 0; m_inh_state = INH_READ; // read-enable the ROM recalc_slot_inh(); } uint8_t a2bus_swyft_device::read_c0nx(uint8_t offset) { switch (offset) { case 0: m_rombank = 0; m_inh_state = INH_READ; recalc_slot_inh(); break; case 1: m_rombank = 0; m_inh_state = INH_NONE; recalc_slot_inh(); break; case 2: m_rombank = 0x1000; m_inh_state = INH_READ; recalc_slot_inh(); break; } return 0xff; } void a2bus_swyft_device::write_c0nx(uint8_t offset, uint8_t data) { switch (offset) { case 0: m_rombank = 0; m_inh_state = INH_READ; recalc_slot_inh(); break; case 1: m_rombank = 0; m_inh_state = INH_NONE; recalc_slot_inh(); break; case 2: m_rombank = 0x1000; m_inh_state = INH_READ; recalc_slot_inh(); break; } } uint8_t a2bus_swyft_device::read_inh_rom(uint16_t offset) { offset -= 0xd000; if (offset < 0x1000) // banked area d000-dfff { return m_rom[offset + m_rombank]; } else // fixed area e000-ffff { return m_rom[offset - 0x1000 + 0x2000]; } } int a2bus_swyft_device::inh_type() { return m_inh_state; } } // anonymous namespace //************************************************************************** // GLOBAL VARIABLES //************************************************************************** DEFINE_DEVICE_TYPE_PRIVATE(A2BUS_SWYFT, device_a2bus_card_interface, a2bus_swyft_device, "a2swyft", "IAI SwyftCard")