// license:BSD-3-Clause // copyright-holders:Curt Coder /********************************************************************** Rex Datentechnik 256KB EPROM cartridge emulation **********************************************************************/ #include "emu.h" #include "rex_ep256.h" //************************************************************************** // DEVICE DEFINITIONS //************************************************************************** DEFINE_DEVICE_TYPE(C64_REX_EP256, c64_rex_ep256_cartridge_device, "c64_rex_ep256", "C64 Rex 256KB EPROM cartridge") //------------------------------------------------- // device_add_mconfig - add device configuration //------------------------------------------------- void c64_rex_ep256_cartridge_device::device_add_mconfig(machine_config &config) { for (auto &eprom : m_eproms) GENERIC_SOCKET(config, eprom, generic_linear_slot, nullptr, "bin,rom"); } //************************************************************************** // LIVE DEVICE //************************************************************************** //------------------------------------------------- // c64_rex_ep256_cartridge_device - constructor //------------------------------------------------- c64_rex_ep256_cartridge_device::c64_rex_ep256_cartridge_device(const machine_config &mconfig, const char *tag, device_t *owner, const XTAL &clock) : device_t(mconfig, C64_REX_EP256, tag, owner, clock), device_c64_expansion_card_interface(mconfig, *this), m_eproms(*this, "rom%u", 1U) { } //------------------------------------------------- // device_start - device-specific startup //------------------------------------------------- void c64_rex_ep256_cartridge_device::device_start() { // state saving save_item(NAME(m_bank)); save_item(NAME(m_reset)); save_item(NAME(m_socket)); } //------------------------------------------------- // device_reset - device-specific reset //------------------------------------------------- void c64_rex_ep256_cartridge_device::device_reset() { m_exrom = 0; m_reset = 1; m_bank = 0; m_socket = 0; } //------------------------------------------------- // c64_cd_r - cartridge data read //------------------------------------------------- uint8_t c64_rex_ep256_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) { if (m_reset) { data = m_roml[offset & 0x1fff]; } else { offs_t addr = (m_bank << 13) | (offset & 0x1fff); data = m_eproms[m_socket]->read_rom(addr); } } else if (!io2) { if ((offset & 0xf0) == 0xc0) { m_exrom = 1; } else if ((offset & 0xf0) == 0xe0) { m_exrom = 0; } } return data; } //------------------------------------------------- // c64_cd_w - cartridge data write //------------------------------------------------- void c64_rex_ep256_cartridge_device::c64_cd_w(offs_t offset, uint8_t data, int sphi2, int ba, int roml, int romh, int io1, int io2) { if (!io2 && ((offset & 0xf0) == 0xa0)) { /* bit description 0 socket selection bit 0 1 socket selection bit 1 2 socket selection bit 2 3 4 5 bank selection bit 0 6 bank selection bit 1 7 */ m_reset = 0; m_socket = data & 0x07; m_bank = (data >> 5) & 0x03; } }