summaryrefslogtreecommitdiffstatshomepage
path: root/src/mess/includes/abc80.h
blob: 6ee641ab7e5168cc9adb4b49550c941f492cf051 (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
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
/*****************************************************************************
 *
 * includes/abc80.h
 *
 ****************************************************************************/

#ifndef __ABC80__
#define __ABC80__


#include "emu.h"
#include "cpu/z80/z80.h"
#include "cpu/z80/z80daisy.h"
#include "imagedev/flopdrv.h"
#include "imagedev/printer.h"
#include "imagedev/cassette.h"
#include "machine/abcbus.h"
#include "machine/abc80kb.h"
#include "machine/abc830.h"
#include "machine/ram.h"
#include "machine/serial.h"
#include "machine/z80pio.h"
#include "sound/sn76477.h"

#define ABC80_HTOTAL	384
#define ABC80_HBEND		35
#define ABC80_HBSTART	384
#define ABC80_VTOTAL	312
#define ABC80_VBEND		15
#define ABC80_VBSTART	312

#define ABC80_K5_HSYNC			0x01
#define ABC80_K5_DH				0x02
#define ABC80_K5_LINE_END		0x04
#define ABC80_K5_ROW_START		0x08

#define ABC80_K2_VSYNC			0x01
#define ABC80_K2_DV				0x02
#define ABC80_K2_FRAME_END		0x04
#define ABC80_K2_FRAME_RESET	0x08

#define ABC80_J3_BLANK			0x01
#define ABC80_J3_TEXT			0x02
#define ABC80_J3_GRAPHICS		0x04
#define ABC80_J3_VERSAL			0x08

#define ABC80_E7_VIDEO_RAM		0x01
#define ABC80_E7_INT_RAM		0x02
#define ABC80_E7_31K_EXT_RAM	0x04
#define ABC80_E7_16K_INT_RAM	0x08

#define ABC80_CHAR_CURSOR		0x80

#define SCREEN_TAG			"screen"
#define Z80_TAG				"ab67"
#define Z80PIO_TAG			"cd67"
#define SN76477_TAG			"g8"
#define RS232_TAG			"ser"
#define TIMER_CASSETTE_TAG	"cass"

class abc80_state : public driver_device
{
public:
	abc80_state(const machine_config &mconfig, device_type type, const char *tag)
		: driver_device(mconfig, type, tag),
		  m_maincpu(*this, Z80_TAG),
		  m_pio(*this, Z80PIO_TAG),
		  m_psg(*this, SN76477_TAG),
		  m_cassette(*this, CASSETTE_TAG),
		  m_bus(*this, ABCBUS_TAG),
		  m_kb(*this, ABC80_KEYBOARD_TAG),
		  m_ram(*this, RAM_TAG),
		  m_rs232(*this, RS232_TAG),
		  m_tape_in(1),
		  m_tape_in_latch(1)
	{ }

	required_device<cpu_device> m_maincpu;
	required_device<z80pio_device> m_pio;
	required_device<device_t> m_psg;
	required_device<cassette_image_device> m_cassette;
	required_device<abcbus_slot_device> m_bus;
	required_device<abc80_keyboard_device> m_kb;
	required_device<ram_device> m_ram;
	required_device<rs232_port_device> m_rs232;

	enum
	{
		TIMER_ID_PIO,
		TIMER_ID_CASSETTE,
		TIMER_ID_BLINK,
		TIMER_ID_VSYNC_ON,
		TIMER_ID_VSYNC_OFF,
		TIMER_ID_FAKE_KEYBOARD_SCAN,
		TIMER_ID_FAKE_KEYBOARD_CLEAR
	};

	virtual void device_timer(emu_timer &timer, device_timer_id id, int param, void *ptr);

	virtual void machine_start();

	virtual void video_start();
	UINT32 screen_update(screen_device &screen, bitmap_rgb32 &bitmap, const rectangle &cliprect);

	void update_screen(bitmap_rgb32 &bitmap, const rectangle &cliprect);

	void scan_keyboard();

	DECLARE_READ8_MEMBER( read );
	DECLARE_WRITE8_MEMBER( write );

	DECLARE_WRITE_LINE_MEMBER( vco_voltage_w );

	DECLARE_READ8_MEMBER( pio_pa_r );
	DECLARE_READ8_MEMBER( pio_pb_r );
	DECLARE_WRITE8_MEMBER( pio_pb_w );

	DECLARE_WRITE_LINE_MEMBER( keydown_w );

	// keyboard state
	int m_key_data;
	int m_key_strobe;
	int m_pio_astb;

	// video state
	UINT8 *m_video_ram;
	UINT8 m_latch;
	int m_blink;

	// cassette state
	int m_tape_in;
	int m_tape_in_latch;

	// memory regions
	const UINT8 *m_mmu_rom;			// memory mapping ROM
	const UINT8 *m_char_rom;		// character generator ROM
	const UINT8 *m_hsync_prom;		// horizontal sync PROM
	const UINT8 *m_vsync_prom;		// horizontal sync PROM
	const UINT8 *m_line_prom;		// line address PROM
	const UINT8 *m_attr_prom;		// character attribute PROM

	// timers
	emu_timer *m_pio_timer;
	emu_timer *m_cassette_timer;
	emu_timer *m_blink_timer;
	emu_timer *m_vsync_on_timer;
	emu_timer *m_vsync_off_timer;
	emu_timer *m_kb_timer;
};

//----------- defined in video/abc80.c -----------

MACHINE_CONFIG_EXTERN( abc80_video );

#endif