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author | 2013-02-10 19:58:50 +0000 | |
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committer | 2013-02-10 19:58:50 +0000 | |
commit | ae951920f0504d8d42e70ebf5344f836d591f3ce (patch) | |
tree | 79a79e587d31d1dedd619ca2289b26fa7eadafd4 /src/mess/machine/c64_vizastar.c | |
parent | 11607bf28e9b2b7699eb586ffd9321021bd6620d (diff) |
(MESS) c64: Added support for the VizaStar cartridge. [Curt Coder]
Diffstat (limited to 'src/mess/machine/c64_vizastar.c')
-rw-r--r-- | src/mess/machine/c64_vizastar.c | 90 |
1 files changed, 90 insertions, 0 deletions
diff --git a/src/mess/machine/c64_vizastar.c b/src/mess/machine/c64_vizastar.c new file mode 100644 index 00000000000..b90eeb81db1 --- /dev/null +++ b/src/mess/machine/c64_vizastar.c @@ -0,0 +1,90 @@ +/********************************************************************** + + VizaWrite 64 cartridge emulation + + Copyright MESS Team. + Visit http://mamedev.org for licensing and usage restrictions. + +**********************************************************************/ + +/* + + PCB Layout + ---------- + RB84 (C) MICROPORT + |===========================| + |=| | + |=| | + |=| | + |=| | + |=| ROM | + |=| | + |=| | + |=| | + |===========================| + + ROM - Hitachi HN462732G EPROM "V" + +*/ + +#include "c64_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", tag, owner, clock), + 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; +} |