// 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 ATTR_COLD; virtual const tiny_rom_entry *device_rom_region() const override ATTR_COLD; // 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 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")