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// license:BSD-3-Clause
// copyright-holders:hap
/******************************************************************************
Videopac 31/40 cartridge emulation
4KB ROM (program ROM is fixed, data ROM is 'bankswitched' via P11)
Used in:
- #31: Musician
- #40: 4 in 1 Row
******************************************************************************/
#include "emu.h"
#include "4in1.h"
namespace {
//-------------------------------------------------
// initialization
//-------------------------------------------------
class o2_4in1_device : public device_t, public device_o2_cart_interface
{
public:
o2_4in1_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock);
protected:
virtual void device_start() override ATTR_COLD;
virtual void cart_init() override;
virtual u8 read_rom04(offs_t offset) override { return m_rom[offset + 0x400]; }
virtual u8 read_rom0c(offs_t offset) override { return m_rom[offset + 0xc00]; }
virtual void write_p1(u8 data) override { m_control = data; }
virtual void write_p2(u8 data) override { m_bank = data; }
virtual u8 io_read(offs_t offset) override;
private:
u8 m_control = 0;
u8 m_bank = 0;
};
o2_4in1_device::o2_4in1_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock) :
device_t(mconfig, O2_ROM_4IN1, tag, owner, clock),
device_o2_cart_interface(mconfig, *this)
{ }
void o2_4in1_device::device_start()
{
save_item(NAME(m_control));
save_item(NAME(m_bank));
}
void o2_4in1_device::cart_init()
{
if (m_rom_size != 0x1000)
fatalerror("o2_4in1_device: ROM size must be 4KB\n");
}
//-------------------------------------------------
// mapper specific handlers
//-------------------------------------------------
u8 o2_4in1_device::io_read(offs_t offset)
{
if (m_control & 2)
return m_rom[m_bank << 8 | offset];
else
return 0xff;
}
} // anonymous namespace
DEFINE_DEVICE_TYPE_PRIVATE(O2_ROM_4IN1, device_o2_cart_interface, o2_4in1_device, "o2_4in1", "Videopac 40 Cartridge")
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