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// license:BSD-3-Clause
// copyright-holders:Curt Coder
/**********************************************************************
Structured Basic cartridge emulation
**********************************************************************/
#include "emu.h"
#include "structured_basic.h"
//**************************************************************************
// DEVICE DEFINITIONS
//**************************************************************************
DEFINE_DEVICE_TYPE(C64_STRUCTURED_BASIC, c64_structured_basic_cartridge_device, "c64_structured_basic", "C64 Structured Basic cartridge")
//**************************************************************************
// LIVE DEVICE
//**************************************************************************
//-------------------------------------------------
// c64_structured_basic_cartridge_device - constructor
//-------------------------------------------------
c64_structured_basic_cartridge_device::c64_structured_basic_cartridge_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) :
device_t(mconfig, C64_STRUCTURED_BASIC, tag, owner, clock),
device_c64_expansion_card_interface(mconfig, *this),
m_bank(0)
{
}
//-------------------------------------------------
// device_start - device-specific startup
//-------------------------------------------------
void c64_structured_basic_cartridge_device::device_start()
{
// state saving
save_item(NAME(m_bank));
}
//-------------------------------------------------
// device_reset - device-specific reset
//-------------------------------------------------
void c64_structured_basic_cartridge_device::device_reset()
{
m_exrom = 0;
m_bank = 0;
}
//-------------------------------------------------
// c64_cd_r - cartridge data read
//-------------------------------------------------
uint8_t c64_structured_basic_cartridge_device::c64_cd_r(address_space &space, offs_t offset, uint8_t 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;
}
//-------------------------------------------------
// c64_cd_w - cartridge data write
//-------------------------------------------------
void c64_structured_basic_cartridge_device::c64_cd_w(address_space &space, offs_t offset, uint8_t data, int sphi2, int ba, int roml, int romh, int io1, int io2)
{
if (!io1)
{
switch (data & 0x03)
{
case 0:
case 1:
m_exrom = 0;
m_bank = 0;
break;
case 2:
m_exrom = 0;
m_bank = 1;
break;
case 3:
m_exrom = 1;
m_bank = 0;
break;
}
}
}
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