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// license:BSD-3-Clause
// copyright-holders:Aaron Giles
/***************************************************************************
74181
4-Bit Arithmetic Logic Unit
***************************************************************************/
#ifndef MAME_MACHINE_74181_H
#define MAME_MACHINE_74181_H
#pragma once
//**************************************************************************
// 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_t clock = 0);
// inputs
void input_a_w(uint8_t data);
void input_b_w(uint8_t data);
void select_w(uint8_t data);
DECLARE_WRITE_LINE_MEMBER( mode_w );
DECLARE_WRITE_LINE_MEMBER( carry_w );
// outputs
uint8_t 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() override;
virtual void device_post_load() override;
private:
void update();
// inputs
uint8_t m_a;
uint8_t m_b;
uint8_t m_s;
int m_m;
int m_c;
// outputs
uint8_t m_f;
int m_cn;
int m_g;
int m_p;
int m_equals;
};
// device type definition
DECLARE_DEVICE_TYPE(TTL74181, ttl74181_device)
#endif // MAME_MACHINE_74181_H
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