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// license:BSD-3-Clause
// copyright-holders:Curt Coder
/**********************************************************************
OKI MSM6255 Dot Matrix LCD Controller implementation
**********************************************************************/
#pragma once
#ifndef __MSM6255__
#define __MSM6255__
#include "emu.h"
///*************************************************************************
// TYPE DEFINITIONS
///*************************************************************************
// ======================> msm6255_device
class msm6255_device : public device_t,
public device_memory_interface,
public device_video_interface
{
public:
// construction/destruction
msm6255_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock);
virtual DECLARE_ADDRESS_MAP(map, 8);
DECLARE_READ8_MEMBER( ir_r );
DECLARE_WRITE8_MEMBER( ir_w );
DECLARE_READ8_MEMBER( dr_r );
DECLARE_WRITE8_MEMBER( dr_w );
UINT32 screen_update(screen_device &device, bitmap_ind16 &bitmap, const rectangle &cliprect);
protected:
// device-level overrides
virtual void device_start() override;
virtual void device_reset() override;
// device_memory_interface overrides
virtual const address_space_config *memory_space_config(address_spacenum spacenum = AS_0) const override;
private:
// registers
enum
{
REGISTER_MOR = 0,
REGISTER_PR,
REGISTER_HNR,
REGISTER_DVR,
REGISTER_CPR,
REGISTER_SLR,
REGISTER_SUR,
REGISTER_CLR,
REGISTER_CUR
};
UINT8 read_byte(UINT16 ma, UINT8 ra);
void update_cursor();
void draw_scanline(bitmap_ind16 &bitmap, const rectangle &cliprect, int y, UINT16 ma, UINT8 ra = 0);
void update_graphics(bitmap_ind16 &bitmap, const rectangle &cliprect);
void update_text(bitmap_ind16 &bitmap, const rectangle &cliprect);
const address_space_config m_space_config;
UINT8 m_ir; // instruction register
UINT8 m_mor; // mode control register
UINT8 m_pr; // character pitch register
UINT8 m_hnr; // horizontal character number register
UINT8 m_dvr; // duty number register
UINT8 m_cpr; // cursor form register
UINT8 m_slr; // start address (lower) register
UINT8 m_sur; // start address (upper) register
UINT8 m_clr; // cursor address (lower) register
UINT8 m_cur; // cursor address (upper) register
int m_cursor; // is cursor displayed
int m_frame; // frame counter
};
// device type definition
extern const device_type MSM6255;
#endif
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