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/**********************************************************************
C64 switchable 8K cartridge emulation
Copyright MESS Team.
Visit http://mamedev.org for licensing and usage restrictions.
**********************************************************************/
/*
4040 + Fast Hack'em
PCB Layout
----------
|===========================|
|=| |
|=| SW1 |
|=| ROM0 |
|=| |
|=| |
|=| ROM1 |
|=| |
|=| |
|===========================|
ROM0,1 - National Semiconductor NMC27C64Q 8Kx8 EPROM
SW1 - ROM selection switch
*/
#include "sw8k.h"
//**************************************************************************
// DEVICE DEFINITIONS
//**************************************************************************
const device_type C64_SW8K = &device_creator<c64_switchable_8k_cartridge_device>;
//-------------------------------------------------
// INPUT_PORTS( c64_easyflash )
//-------------------------------------------------
static INPUT_PORTS_START( c64_switchable_8k )
PORT_START("SW")
PORT_DIPNAME( 0x01, 0x00, "ROM Select" )
PORT_DIPSETTING( 0x00, "ROM 0" )
PORT_DIPSETTING( 0x01, "ROM 1" )
INPUT_PORTS_END
//-------------------------------------------------
// input_ports - device-specific input ports
//-------------------------------------------------
ioport_constructor c64_switchable_8k_cartridge_device::device_input_ports() const
{
return INPUT_PORTS_NAME( c64_switchable_8k );
}
//**************************************************************************
// LIVE DEVICE
//**************************************************************************
//-------------------------------------------------
// c64_switchable_8k_cartridge_device - constructor
//-------------------------------------------------
c64_switchable_8k_cartridge_device::c64_switchable_8k_cartridge_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock) :
device_t(mconfig, C64_SW8K, "C64 Switchable 8K cartridge", tag, owner, clock, "c64_sw8k", __FILE__),
device_c64_expansion_card_interface(mconfig, *this),
m_sw(*this, "SW")
{
}
//-------------------------------------------------
// device_start - device-specific startup
//-------------------------------------------------
void c64_switchable_8k_cartridge_device::device_start()
{
}
//-------------------------------------------------
// device_reset - device-specific reset
//-------------------------------------------------
void c64_switchable_8k_cartridge_device::device_reset()
{
m_bank = m_sw->read();
}
//-------------------------------------------------
// c64_cd_r - cartridge data read
//-------------------------------------------------
UINT8 c64_switchable_8k_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)
{
offs_t addr = (m_bank << 13) | (offset & 0x1fff);
data = m_roml[addr];
}
return data;
}
|