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// license:BSD-3-Clause
// copyright-holders:Wilbert Pol
/*****************************************************************************
*
* includes/electron.h
*
* Acorn Electron
*
* Driver by Wilbert Pol
*
****************************************************************************/
#ifndef ELECTRON_H_
#define ELECTRON_H_
#include "imagedev/cassette.h"
#include "sound/beep.h"
#include "bus/generic/slot.h"
#include "bus/generic/carts.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:
enum
{
TIMER_TAPE_HANDLER,
TIMER_SETUP_BEEP,
TIMER_SCANLINE_INTERRUPT
};
electron_state(const machine_config &mconfig, device_type type, const char *tag)
: driver_device(mconfig, type, tag),
m_maincpu(*this, "maincpu"),
m_cassette(*this, "cassette"),
m_beeper(*this, "beeper"),
m_cart(*this, "cartslot"),
m_keybd(*this, "LINE")
{ }
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 machine_reset();
virtual void video_start();
DECLARE_PALETTE_INIT(electron);
UINT32 screen_update_electron(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect);
TIMER_CALLBACK_MEMBER(electron_tape_timer_handler);
TIMER_CALLBACK_MEMBER(setup_beep);
TIMER_CALLBACK_MEMBER(electron_scanline_interrupt);
required_device<cpu_device> m_maincpu;
required_device<cassette_image_device> m_cassette;
required_device<beep_device> m_beeper;
required_device<generic_slot_device> m_cart;
required_ioport_array<14> m_keybd;
inline UINT8 read_vram( UINT16 addr );
inline void electron_plot_pixel(bitmap_ind16 &bitmap, int x, int y, UINT32 color);
void electron_interrupt_handler(int mode, int interrupt);
DECLARE_DEVICE_IMAGE_LOAD_MEMBER( electron_cart );
protected:
virtual void device_timer(emu_timer &timer, device_timer_id id, int param, void *ptr);
};
#endif /* ELECTRON_H_ */
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