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// license:BSD-3-Clause
// copyright-holders:Aaron Giles
/***************************************************************************
74181
4-Bit Arithmetic Logic Unit
***************************************************************************/
#pragma once
#ifndef __74181_H__
#define __74181_H__
#include "emu.h"
//**************************************************************************
// INTERFACE CONFIGURATION MACROS
//**************************************************************************
#define MCFG_TTL74181_ADD(_tag) \
MCFG_DEVICE_ADD(_tag, TTL74181, 0)
//**************************************************************************
// TYPE DEFINITIONS
//**************************************************************************
// ======================> ttl74181_device
class ttl74181_device : public device_t
{
public:
// construction/destruction
ttl74181_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock);
// inputs
void input_a_w(UINT8 data);
void input_b_w(UINT8 data);
void select_w(UINT8 data);
DECLARE_WRITE_LINE_MEMBER( mode_w );
DECLARE_WRITE_LINE_MEMBER( carry_w );
// outputs
UINT8 function_r() { return m_f; }
DECLARE_READ_LINE_MEMBER( carry_r ) { return m_cn; }
DECLARE_READ_LINE_MEMBER( generate_r ) { return m_g; }
DECLARE_READ_LINE_MEMBER( propagate_r ) { return m_p; }
DECLARE_READ_LINE_MEMBER( equals_r ) { return m_equals; }
protected:
// device-level overrides
virtual void device_start();
virtual void device_post_load();
private:
void update();
// inputs
UINT8 m_a;
UINT8 m_b;
UINT8 m_s;
int m_m;
int m_c;
// outputs
UINT8 m_f;
int m_cn;
int m_g;
int m_p;
int m_equals;
};
// device type definition
extern const device_type TTL74181;
#endif /* __74181_H__ */
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