diff options
Diffstat (limited to 'src/devices/bus/c64/vizastar.cpp')
-rw-r--r-- | src/devices/bus/c64/vizastar.cpp | 89 |
1 files changed, 89 insertions, 0 deletions
diff --git a/src/devices/bus/c64/vizastar.cpp b/src/devices/bus/c64/vizastar.cpp new file mode 100644 index 00000000000..d635ffec656 --- /dev/null +++ b/src/devices/bus/c64/vizastar.cpp @@ -0,0 +1,89 @@ +// license:BSD-3-Clause +// copyright-holders:Curt Coder +/********************************************************************** + + VizaStar 64 XL4 cartridge emulation + +**********************************************************************/ + +/* + + PCB Layout + ---------- + RB84 (C) MICROPORT + |===========================| + |=| | + |=| | + |=| | + |=| | + |=| ROM | + |=| | + |=| | + |=| | + |===========================| + + ROM - Hitachi HN462732G 4Kx8 EPROM "V" + +*/ + +#include "vizastar.h" + + + +//************************************************************************** +// MACROS/CONSTANTS +//************************************************************************** + +#define UNSCRAMBLE_ADDRESS(_offset) \ + BITSWAP16(_offset,15,14,13,12,5,0,7,10,11,9,8,6,4,3,2,1) + +#define UNSCRAMBLE_DATA(_data) \ + BITSWAP8(_data,7,6,0,5,1,4,2,3) + + + +//************************************************************************** +// DEVICE DEFINITIONS +//************************************************************************** + +const device_type C64_VIZASTAR = &device_creator<c64_vizastar_cartridge_device>; + + + +//************************************************************************** +// LIVE DEVICE +//************************************************************************** + +//------------------------------------------------- +// c64_vizastar_cartridge_device - constructor +//------------------------------------------------- + +c64_vizastar_cartridge_device::c64_vizastar_cartridge_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock) : + device_t(mconfig, C64_VIZASTAR, "VizaStar 64 XL4", tag, owner, clock, "c64_vizastar", __FILE__), + device_c64_expansion_card_interface(mconfig, *this) +{ +} + + +//------------------------------------------------- +// device_start - device-specific startup +//------------------------------------------------- + +void c64_vizastar_cartridge_device::device_start() +{ +} + + +//------------------------------------------------- +// c64_cd_r - cartridge data read +//------------------------------------------------- + +UINT8 c64_vizastar_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) + { + data = UNSCRAMBLE_DATA(m_roml[UNSCRAMBLE_ADDRESS(offset & 0xfff)]); + } + + return data; +} |