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/*****************************************************************************
*
* includes/electron.h
*
* Acorn Electron
*
* Driver by Wilbert Pol
*
****************************************************************************/
#ifndef ELECTRON_H_
#define ELECTRON_H_
/* Interrupts */
#define INT_HIGH_TONE 0x40
#define INT_TRANSMIT_EMPTY 0x20
#define INT_RECEIVE_FULL 0x10
#define INT_RTC 0x08
#define INT_DISPLAY_END 0x04
#define INT_SET 0x100
#define INT_CLEAR 0x200
/* ULA context */
struct ULA
{
UINT8 interrupt_status;
UINT8 interrupt_control;
UINT8 rompage;
UINT16 screen_start;
UINT16 screen_base;
int screen_size;
UINT16 screen_addr;
UINT8 *vram;
int current_pal[16];
int communication_mode;
int screen_mode;
int cassette_motor_mode;
int capslock_mode;
// int scanline;
/* tape reading related */
UINT32 tape_value;
int tape_steps;
int bit_count;
int high_tone_set;
int start_bit;
int stop_bit;
int tape_running;
UINT8 tape_byte;
};
class electron_state : public driver_device
{
public:
electron_state(const machine_config &mconfig, device_type type, const char *tag)
: driver_device(mconfig, type, tag) { }
ULA m_ula;
emu_timer *m_tape_timer;
int m_map4[256];
int m_map16[256];
emu_timer *m_scanline_timer;
DECLARE_READ8_MEMBER(electron_read_keyboard);
DECLARE_READ8_MEMBER(electron_jim_r);
DECLARE_WRITE8_MEMBER(electron_jim_w);
DECLARE_READ8_MEMBER(electron_1mhz_r);
DECLARE_WRITE8_MEMBER(electron_1mhz_w);
DECLARE_READ8_MEMBER(electron_ula_r);
DECLARE_WRITE8_MEMBER(electron_ula_w);
void electron_tape_start();
void electron_tape_stop();
virtual void machine_start();
virtual void video_start();
virtual void palette_init();
UINT32 screen_update_electron(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect);
};
/*----------- defined in machine/electron.c -----------*/
void electron_interrupt_handler(running_machine &machine, int mode, int interrupt);
#endif /* ELECTRON_H_ */
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