// license:BSD-3-Clause // copyright-holders:Curt Coder /********************************************************************** Scanntronik Pagefox cartridge emulation **********************************************************************/ /* PCB Layout ---------- |===========================| |=| | |=| RAM LS11 | |=| | |=| LS139 | |=| ROM0 | |=| LS273 | |=| | |=| ROM1 LS00 | |===========================| RAM - NEC D43256-12L 32Kx8 RAM ROM0 - SGS M27256-2FI 32Kx8 EPROM ROM1 - National Instruments NMC27C256Q 32Kx8 EPROM */ #include "emu.h" #include "pagefox.h" //************************************************************************** // DEVICE DEFINITIONS //************************************************************************** DEFINE_DEVICE_TYPE(C64_PAGEFOX, c64_pagefox_cartridge_device, "c64_pagefox", "C64 Pagefox cartridge") //************************************************************************** // LIVE DEVICE //************************************************************************** //------------------------------------------------- // c64_pagefox_cartridge_device - constructor //------------------------------------------------- c64_pagefox_cartridge_device::c64_pagefox_cartridge_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) : device_t(mconfig, C64_PAGEFOX, tag, owner, clock), device_c64_expansion_card_interface(mconfig, *this), m_ram(*this, "ram", 0x8000, ENDIANNESS_LITTLE), m_bank(0) { } //------------------------------------------------- // device_start - device-specific startup //------------------------------------------------- void c64_pagefox_cartridge_device::device_start() { // state saving save_item(NAME(m_bank)); } //------------------------------------------------- // device_reset - device-specific reset //------------------------------------------------- void c64_pagefox_cartridge_device::device_reset() { m_bank = 0; } //------------------------------------------------- // c64_cd_r - cartridge data read //------------------------------------------------- uint8_t c64_pagefox_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 || !romh) { if (BIT(m_bank, 3)) { offs_t addr = (BIT(m_bank, 1) << 14) | (offset & 0x3fff); data = m_ram[addr]; } else { int bank = (m_bank >> 1) & 0x07; offs_t addr = (bank << 14) | (offset & 0x3fff); data = m_roml[addr]; } } return data; } //------------------------------------------------- // c64_cd_w - cartridge data write //------------------------------------------------- void c64_pagefox_cartridge_device::c64_cd_w(offs_t offset, uint8_t data, int sphi2, int ba, int roml, int romh, int io1, int io2) { if (offset >= 0x8000 && offset < 0xc000) { if (BIT(m_bank, 3)) { offs_t addr = (BIT(m_bank, 1) << 14) | (offset & 0x3fff); m_ram[addr] = data; } } else if (!io1 && BIT(offset, 7)) { if (data == 0xff) { m_game = 1; m_exrom = 1; } else { m_game = 0; m_exrom = 0; } m_bank = data; } }