diff options
Diffstat (limited to 'src/mess/machine/c64/pagefox.c')
-rw-r--r-- | src/mess/machine/c64/pagefox.c | 134 |
1 files changed, 134 insertions, 0 deletions
diff --git a/src/mess/machine/c64/pagefox.c b/src/mess/machine/c64/pagefox.c new file mode 100644 index 00000000000..4d22263be4d --- /dev/null +++ b/src/mess/machine/c64/pagefox.c @@ -0,0 +1,134 @@ +/********************************************************************** + + Scanntronik Pagefox cartridge emulation + + Copyright MESS Team. + Visit http://mamedev.org for licensing and usage restrictions. + +**********************************************************************/ + +/* + + 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 "pagefox.h" + + + +//************************************************************************** +// DEVICE DEFINITIONS +//************************************************************************** + +const device_type C64_PAGEFOX = &device_creator<c64_pagefox_cartridge_device>; + + + +//************************************************************************** +// 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 clock) : + device_t(mconfig, C64_PAGEFOX, "C64 Pagefox cartridge", tag, owner, clock, "c64_pagefox", __FILE__), + device_c64_expansion_card_interface(mconfig, *this) +{ +} + + +//------------------------------------------------- +// 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 c64_pagefox_cartridge_device::c64_cd_r(address_space &space, offs_t offset, UINT8 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(address_space &space, offs_t offset, UINT8 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; + } +} |