// license:BSD-3-Clause // copyright-holders:Curt Coder /********************************************************************** C64 switchable 8K cartridge emulation **********************************************************************/ /* 4040 + Fast Hack'em PCB Layout ---------- |===========================| |=| | |=| SW1 | |=| ROM0 | |=| | |=| | |=| ROM1 | |=| | |=| | |===========================| ROM0,1 - National Semiconductor NMC27C64Q 8Kx8 EPROM SW1 - ROM selection switch */ #include "emu.h" #include "sw8k.h" //************************************************************************** // DEVICE DEFINITIONS //************************************************************************** DEFINE_DEVICE_TYPE(C64_SW8K, c64_switchable_8k_cartridge_device, "c64_sw8k", "C64 Switchable 8K cartridge") //------------------------------------------------- // INPUT_PORTS( c64_easyflash ) //------------------------------------------------- static INPUT_PORTS_START( c64_switchable_8k ) PORT_START("SW") PORT_DIPNAME( 0x01, 0x00, "ROM Select" ) PORT_DIPSETTING( 0x00, "ROM 0" ) PORT_DIPSETTING( 0x01, "ROM 1" ) INPUT_PORTS_END //------------------------------------------------- // input_ports - device-specific input ports //------------------------------------------------- ioport_constructor c64_switchable_8k_cartridge_device::device_input_ports() const { return INPUT_PORTS_NAME( c64_switchable_8k ); } //************************************************************************** // LIVE DEVICE //************************************************************************** //------------------------------------------------- // c64_switchable_8k_cartridge_device - constructor //------------------------------------------------- c64_switchable_8k_cartridge_device::c64_switchable_8k_cartridge_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) : device_t(mconfig, C64_SW8K, tag, owner, clock), device_c64_expansion_card_interface(mconfig, *this), m_sw(*this, "SW"), m_bank(0) { } //------------------------------------------------- // device_start - device-specific startup //------------------------------------------------- void c64_switchable_8k_cartridge_device::device_start() { } //------------------------------------------------- // device_reset - device-specific reset //------------------------------------------------- void c64_switchable_8k_cartridge_device::device_reset() { m_bank = m_sw->read(); } //------------------------------------------------- // c64_cd_r - cartridge data read //------------------------------------------------- uint8_t c64_switchable_8k_cartridge_device::c64_cd_r(offs_t offset, uint8_t data, int sphi2, int ba, int roml, int romh, int io1, int io2) { if (!roml) { offs_t addr = (m_bank << 13) | (offset & 0x1fff); data = m_roml[addr]; } return data; }