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-rw-r--r--src/devices/bus/pet/64k.h56
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diff --git a/src/devices/bus/pet/64k.h b/src/devices/bus/pet/64k.h
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+// license:BSD-3-Clause
+// copyright-holders:Curt Coder
+/**********************************************************************
+
+ Commodore PET 64KB RAM Expansion emulation
+
+**********************************************************************/
+
+#pragma once
+
+#ifndef __PET_64K__
+#define __PET_64K__
+
+#include "emu.h"
+#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 clock);
+
+protected:
+ // device-level overrides
+ virtual void device_start();
+ virtual void device_reset();
+
+ // device_pet_expansion_card_interface overrides
+ virtual int pet_norom_r(address_space &space, offs_t offset, int sel);
+ virtual UINT8 pet_bd_r(address_space &space, offs_t offset, UINT8 data, int &sel);
+ virtual void pet_bd_w(address_space &space, offs_t offset, UINT8 data, int &sel);
+
+private:
+ inline UINT8 read_ram(offs_t offset);
+ inline void write_ram(offs_t offset, UINT8 data);
+
+ optional_shared_ptr<UINT8> m_ram;
+
+ UINT8 m_ctrl;
+};
+
+
+// device type definition
+extern const device_type PET_64K;
+
+
+#endif