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/*
Manchester Small-Scale Experimental Machine (SSEM) emulator
Written by MooglyGuy
*/
#pragma once
#ifndef __SSEM_H__
#define __SSEM_H__
//**************************************************************************
// TYPE DEFINITIONS
//**************************************************************************
// ======================> ssem_device
// Used by core CPU interface
class ssem_device : public cpu_device
{
public:
// construction/destruction
ssem_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock);
// device-level overrides
virtual void device_start();
virtual void device_reset();
virtual void device_stop();
// device_execute_interface overrides
virtual UINT32 execute_min_cycles() const;
virtual UINT32 execute_max_cycles() const;
virtual UINT32 execute_input_lines() const;
virtual void execute_run();
virtual void execute_set_input(int inputnum, int state);
// device_memory_interface overrides
virtual const address_space_config *memory_space_config(address_spacenum spacenum = AS_0) const;
// device_disasm_interface overrides
virtual UINT32 disasm_min_opcode_bytes() const;
virtual UINT32 disasm_max_opcode_bytes() const;
virtual offs_t disasm_disassemble(char *buffer, offs_t pc, const UINT8 *oprom, const UINT8 *opram, UINT32 options);
// device_state_interface overrides
virtual void state_string_export(const device_state_entry &entry, astring &string);
// address spaces
const address_space_config m_program_config;
// memory access
inline UINT32 program_read32(UINT32 addr);
inline void program_write32(UINT32 addr, UINT32 data);
// CPU registers
UINT32 m_pc;
UINT32 m_shifted_pc;
UINT32 m_a;
UINT32 m_halt;
// other internal states
int m_icount;
// address spaces
address_space *m_program;
};
// device type definition
extern const device_type SSEMCPU;
/***************************************************************************
REGISTER ENUMERATION
***************************************************************************/
enum
{
SSEM_PC = 1,
SSEM_A,
SSEM_HALT,
};
CPU_DISASSEMBLE( ssem );
#endif /* __SSEM_H__ */
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