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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.
***************************************************************************/
#ifndef MAME_VIDEO_EF9340_1_H
#define MAME_VIDEO_EF9340_1_H
#pragma once
class ef9340_1_device : public device_t,
public device_video_interface
{
public:
// construction/destruction
template <typename T>
ef9340_1_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock, T &&screen_tag)
: ef9340_1_device(mconfig, tag, owner, clock)
{
set_screen(std::forward<T>(screen_tag));
}
ef9340_1_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock);
inline bitmap_ind16 *get_bitmap() { return &m_tmp_bitmap; }
void ef9341_write( uint8_t command, uint8_t b, uint8_t data );
uint8_t ef9341_read( uint8_t command, uint8_t b );
protected:
// device-level overrides
virtual void device_start() override;
virtual void device_reset() override;
virtual void device_timer(emu_timer &timer, device_timer_id id, int param, void *ptr) override;
virtual const tiny_rom_entry *device_rom_region() const override;
inline uint16_t ef9340_get_c_addr(uint8_t x, uint8_t y);
inline void ef9340_inc_c();
// Calculate the external chargen address for a character and slice
inline uint16_t external_chargen_address(uint8_t b, uint8_t slice);
void ef9340_scanline(int vpos);
/* timers */
static constexpr device_timer_id TIMER_LINE = 0;
emu_timer *m_line_timer;
required_region_ptr<uint8_t> m_charset;
bitmap_ind16 m_tmp_bitmap;
struct
{
uint8_t TA;
uint8_t TB;
uint8_t busy;
} m_ef9341;
struct
{
uint8_t X;
uint8_t Y;
uint8_t Y0;
uint8_t R;
uint8_t M;
int max_vpos;
} m_ef9340;
uint8_t m_ef934x_ram_a[1024];
uint8_t m_ef934x_ram_b[1024];
uint8_t 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
DECLARE_DEVICE_TYPE(EF9340_1, ef9340_1_device)
#endif // MAME_VIDEO_EF9340_1_H
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