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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_ */