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/**********************************************************************
VizaStar 64 XL4 cartridge emulation
Copyright MESS Team.
Visit http://mamedev.org for licensing and usage restrictions.
**********************************************************************/
/*
PCB Layout
----------
RB84 (C) MICROPORT
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ROM - Hitachi HN462732G 4Kx8 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 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;
}
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