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// license:BSD-3-Clause
// copyright-holders:Curt Coder
/**********************************************************************
Commodore PET 64KB RAM Expansion emulation
**********************************************************************/
#ifndef MAME_BUS_PET_64K_H
#define MAME_BUS_PET_64K_H
#pragma once
#include "exp.h"
//**************************************************************************
// TYPE DEFINITIONS
//**************************************************************************
// ======================> pet_64k_expansion_device
class pet_64k_expansion_device : public device_t, public device_pet_expansion_card_interface
{
public:
// construction/destruction
pet_64k_expansion_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock);
protected:
// device-level overrides
virtual void device_start() override;
virtual void device_reset() override;
// device_pet_expansion_card_interface overrides
virtual int pet_norom_r(offs_t offset, int sel) override;
virtual uint8_t pet_bd_r(offs_t offset, uint8_t data, int &sel) override;
virtual void pet_bd_w(offs_t offset, uint8_t data, int &sel) override;
private:
inline uint8_t read_ram(offs_t offset);
inline void write_ram(offs_t offset, uint8_t data);
optional_shared_ptr<uint8_t> m_ram;
uint8_t m_ctrl;
};
// device type definition
DECLARE_DEVICE_TYPE(PET_64K, pet_64k_expansion_device)
#endif // MAME_BUS_PET_64K_H
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