summaryrefslogtreecommitdiffstatshomepage
path: root/src/mame/includes/electron.h
blob: 589e79d15547158682348d3a346c9dd34a12fed1 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
// license:BSD-3-Clause
// copyright-holders:Wilbert Pol
/*****************************************************************************
 *
 * includes/electron.h
 *
 * Acorn Electron
 *
 * Driver by Wilbert Pol
 *
 ****************************************************************************/

#ifndef ELECTRON_H_
#define ELECTRON_H_

#include "machine/ram.h"
#include "imagedev/cassette.h"
#include "sound/beep.h"

#include "bus/electron/exp.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

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_keybd(*this, "LINE.%u", 0),
		m_exp(*this, "exp"),
		m_ram(*this, RAM_TAG)
	{ }

	/* ULA context */

	struct ULA
	{
		uint8_t interrupt_status;
		uint8_t interrupt_control;
		uint8_t rompage;
		uint16_t screen_start;
		uint16_t screen_base;
		int screen_size;
		uint16_t screen_addr;
		uint8_t *vram;
		int current_pal[16];
		int communication_mode;
		int screen_mode;
		int cassette_motor_mode;
		int capslock_mode;
		//  int scanline;
		/* tape reading related */
		uint32_t tape_value;
		int tape_steps;
		int bit_count;
		int high_tone_set;
		int start_bit;
		int stop_bit;
		int tape_running;
		uint8_t tape_byte;
	};

	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_mem_r);
	DECLARE_WRITE8_MEMBER(electron_mem_w);
	DECLARE_READ8_MEMBER(electron_paged_r);
	DECLARE_WRITE8_MEMBER(electron_paged_w);
	DECLARE_READ8_MEMBER(electron_fred_r);
	DECLARE_WRITE8_MEMBER(electron_fred_w);
	DECLARE_READ8_MEMBER(electron_jim_r);
	DECLARE_WRITE8_MEMBER(electron_jim_w);
	DECLARE_READ8_MEMBER(electron_sheila_r);
	DECLARE_WRITE8_MEMBER(electron_sheila_w);
	void waitforramsync();
	void electron_tape_start();
	void electron_tape_stop();
	virtual void machine_start() override;
	virtual void machine_reset() override;
	virtual void video_start() override;
	DECLARE_PALETTE_INIT(electron);
	uint32_t 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_ioport_array<14> m_keybd;
	required_device<electron_expansion_slot_device> m_exp;
	required_device<ram_device> m_ram;
	inline uint8_t read_vram( uint16_t addr );
	inline void electron_plot_pixel(bitmap_ind16 &bitmap, int x, int y, uint32_t color);
	void electron_interrupt_handler(int mode, int interrupt);
	DECLARE_INPUT_CHANGED_MEMBER( trigger_reset );

	void electron(machine_config &config);
	void btm2105(machine_config &config);
protected:
	virtual void device_timer(emu_timer &timer, device_timer_id id, int param, void *ptr) override;
};


#endif /* ELECTRON_H_ */