// license:BSD-3-Clause // copyright-holders:Nigel Barnes /********************************************************************** GCC (Cambridge) Romex 13 http://chrisacorns.computinghistory.org.uk/8bit_Upgrades/GCC_Romex13.html **********************************************************************/ #include "emu.h" #include "romex.h" //************************************************************************** // DEVICE DEFINITIONS //************************************************************************** DEFINE_DEVICE_TYPE(BBC_ROMEX13, bbc_romex13_device, "bbc_romex13", "GCC Romex13 ROM Expansion"); //------------------------------------------------- // device_add_mconfig - add device configuration //------------------------------------------------- void bbc_romex13_device::device_add_mconfig(machine_config &config) { /* TODO: romslot2 is unavailable when board is fitted, replaced by socket on board */ //config.device_remove(":romslot2"); /* 13 rom sockets */ BBC_ROMSLOT16(config, m_rom[2], bbc_rom_devices, nullptr); BBC_ROMSLOT16(config, m_rom[4], bbc_rom_devices, nullptr); BBC_ROMSLOT16(config, m_rom[5], bbc_rom_devices, nullptr); BBC_ROMSLOT16(config, m_rom[6], bbc_rom_devices, nullptr); BBC_ROMSLOT16(config, m_rom[7], bbc_rom_devices, nullptr); BBC_ROMSLOT16(config, m_rom[8], bbc_rom_devices, nullptr); BBC_ROMSLOT16(config, m_rom[9], bbc_rom_devices, nullptr); BBC_ROMSLOT16(config, m_rom[10], bbc_rom_devices, nullptr); BBC_ROMSLOT16(config, m_rom[11], bbc_rom_devices, nullptr); BBC_ROMSLOT16(config, m_rom[12], bbc_rom_devices, nullptr); BBC_ROMSLOT16(config, m_rom[13], bbc_rom_devices, nullptr); BBC_ROMSLOT16(config, m_rom[14], bbc_rom_devices, nullptr); BBC_ROMSLOT16(config, m_rom[15], bbc_rom_devices, nullptr); } //************************************************************************** // LIVE DEVICE //************************************************************************** //------------------------------------------------- // bbc_romex13_device - constructor //------------------------------------------------- bbc_romex13_device::bbc_romex13_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) : device_t(mconfig, BBC_ROMEX13, tag, owner, clock) , device_bbc_internal_interface(mconfig, *this) , m_rom(*this, "romslot%u", 0U) { } //------------------------------------------------- // device_start - device-specific startup //------------------------------------------------- void bbc_romex13_device::device_start() { /* move internal roms to board */ memmove(m_region_swr->base() + 0x30000, m_region_swr->base(), 0x10000); memset(m_region_swr->base(), 0xff, 0x10000); /* register for save states */ save_item(NAME(m_romsel)); } //************************************************************************** // IMPLEMENTATION //************************************************************************** uint8_t bbc_romex13_device::paged_r(offs_t offset) { uint8_t data = 0xff; switch (m_romsel) { case 0: case 1: case 3: /* motherboard rom sockets */ if (m_mb_rom[m_romsel] && m_mb_rom[m_romsel]->present()) { data = m_mb_rom[m_romsel]->read(offset); } else { data = m_region_swr->base()[offset + (m_romsel << 14)]; } break; default: /* expansion board sockets */ if (m_rom[m_romsel] && m_rom[m_romsel]->present()) { data = m_rom[m_romsel]->read(offset); } else { data = m_region_swr->base()[offset + (m_romsel << 14)]; } break; } return data; } void bbc_romex13_device::paged_w(offs_t offset, uint8_t data) { switch (m_romsel) { case 0: case 1: case 3: /* motherboard rom sockets */ if (m_mb_rom[m_romsel]) { m_mb_rom[m_romsel]->write(offset, data); } break; default: /* expansion board sockets */ if (m_rom[m_romsel]) { m_rom[m_romsel]->write(offset, data); } break; } }