summaryrefslogtreecommitdiffstatshomepage
path: root/src/mame/includes/slapstic.h
blob: eb476a02422c47361d562de8b0149c3397220f1d (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
156
157
158
159
160
161
162
163
// license:BSD-3-Clause
// copyright-holders:Aaron Giles
/*************************************************************************

    Atari Slapstic decoding helper

**************************************************************************

    For more information on the slapstic, see slapstic.html, or go to
    http://www.aarongiles.com/slapstic.html

*************************************************************************/

#ifndef MAME_INCLUDES_SLAPSTIC_H
#define MAME_INCLUDES_SLAPSTIC_H

#pragma once


DECLARE_DEVICE_TYPE(SLAPSTIC, atari_slapstic_device)

#define MCFG_SLAPSTIC_ADD(_tag, _chip) \
	MCFG_DEVICE_ADD(_tag, SLAPSTIC, 0) \
	MCFG_SLAPSTIC_NUM(_chip)


/*************************************
 *
 *  Structure of slapstic params
 *
 *************************************/

struct mask_value
{
	int mask, value;
};


struct slapstic_data
{
	int bankstart;
	int bank[4];

	struct mask_value alt1;
	struct mask_value alt2;
	struct mask_value alt3;
	struct mask_value alt4;
	int altshift;

	struct mask_value bit1;
	struct mask_value bit2c0;
	struct mask_value bit2s0;
	struct mask_value bit2c1;
	struct mask_value bit2s1;
	struct mask_value bit3;

	struct mask_value add1;
	struct mask_value add2;
	struct mask_value addplus1;
	struct mask_value addplus2;
	struct mask_value add3;
};



/*************************************
 *
 *  Shorthand
 *
 *************************************/

#define UNKNOWN 0xffff
#define NO_BITWISE          \
	{ UNKNOWN,UNKNOWN },    \
	{ UNKNOWN,UNKNOWN },    \
	{ UNKNOWN,UNKNOWN },    \
	{ UNKNOWN,UNKNOWN },    \
	{ UNKNOWN,UNKNOWN },    \
	{ UNKNOWN,UNKNOWN }
#define NO_ADDITIVE         \
	{ UNKNOWN,UNKNOWN },    \
	{ UNKNOWN,UNKNOWN },    \
	{ UNKNOWN,UNKNOWN },    \
	{ UNKNOWN,UNKNOWN },    \
	{ UNKNOWN,UNKNOWN }

#define MATCHES_MASK_VALUE(val, maskval)    (((val) & (maskval).mask) == (maskval).value)



/*************************************
 *
 *  Constants
 *
 *************************************/

enum
{
	DISABLED,
	ENABLED,
	ALTERNATE1,
	ALTERNATE2,
	ALTERNATE3,
	BITWISE1,
	BITWISE2,
	BITWISE3,
	ADDITIVE1,
	ADDITIVE2,
	ADDITIVE3
};


#define MCFG_SLAPSTIC_NUM(_chipnum) \
	downcast<atari_slapstic_device &>(*device).set_chipnum(_chipnum);

#define MCFG_SLAPSTIC_68K_ACCESS(_type) \
	downcast<atari_slapstic_device &>(*device).set_access68k(_type);



class atari_slapstic_device :  public device_t
{
public:
	// construction/destruction
	atari_slapstic_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock);

	void slapstic_init();
	void slapstic_reset();

	int slapstic_bank();
	int slapstic_tweak(address_space &space, offs_t offset);

	int alt2_kludge(address_space &space, offs_t offset);

	void set_access68k(int type) { access_68k = type; }

	void set_chipnum(int chipnum) { m_chipnum = chipnum; }

	int m_chipnum;

	uint8_t state;
	uint8_t current_bank;
	int access_68k;

	uint8_t alt_bank;
	uint8_t bit_bank;
	uint8_t add_bank;
	uint8_t bit_xor;

	struct slapstic_data slapstic;


	void slapstic_log(running_machine &machine, offs_t offset);
	FILE *slapsticlog;


protected:
	virtual void device_start() override;
	virtual void device_reset() override;
	virtual void device_validity_check(validity_checker &valid) const override;
};

#endif // MAME_INCLUDES_SLAPSTIC_H