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// license:BSD-3-Clause
// copyright-holders:Wilbert Pol
/***************************************************************************
ef9340_1.h
Thomson EF9340 + EF9341 teletext graphics chips with 1KB external
character ram.
***************************************************************************/
#pragma once
#ifndef __EF9340_1_H__
#define __EF9340_1_H__
#include "emu.h"
#define MCFG_EF9340_1_ADD(_tag, _clock, _screen_tag) \
MCFG_DEVICE_ADD(_tag, EF9340_1, _clock) \
MCFG_VIDEO_SET_SCREEN(_screen_tag)
class ef9340_1_device : public device_t,
public device_video_interface
{
public:
// construction/destruction
ef9340_1_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock);
inline bitmap_ind16 *get_bitmap() { return &m_tmp_bitmap; }
void ef9341_write( UINT8 command, UINT8 b, UINT8 data );
UINT8 ef9341_read( UINT8 command, UINT8 b );
protected:
// device-level overrides
virtual void device_start();
virtual void device_reset();
virtual void device_timer(emu_timer &timer, device_timer_id id, int param, void *ptr);
inline UINT16 ef9340_get_c_addr(UINT8 x, UINT8 y);
inline void ef9340_inc_c();
// Calculate the external chargen address for a character and slice
inline UINT16 external_chargen_address(UINT8 b, UINT8 slice);
void ef9340_scanline(int vpos);
/* timers */
static const device_timer_id TIMER_LINE = 0;
emu_timer *m_line_timer;
bitmap_ind16 m_tmp_bitmap;
struct
{
UINT8 TA;
UINT8 TB;
UINT8 busy;
} m_ef9341;
struct
{
UINT8 X;
UINT8 Y;
UINT8 Y0;
UINT8 R;
UINT8 M;
int max_vpos;
} m_ef9340;
UINT8 m_ef934x_ram_a[1024];
UINT8 m_ef934x_ram_b[1024];
UINT8 m_ef934x_ext_char_ram[2048]; /* The G7400 has 2KB of external ram hooked up. The datasheet only describes how to hookup 1KB. */
};
// device type definition
extern const device_type EF9340_1;
#endif /* __EF9340_1_H__ */
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