summaryrefslogtreecommitdiffstatshomepage
path: root/src/mess/machine/pce_slot.c
blob: a4286622710c80d577ec2859697f3982da6771dc (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
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
/***********************************************************************************************************


    PC-Engine / Turbografx-16 cart emulation
    (through slot devices)

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


#include "emu.h"
#include "machine/pce_slot.h"

//**************************************************************************
//  GLOBAL VARIABLES
//**************************************************************************

const device_type PCE_CART_SLOT = &device_creator<pce_cart_slot_device>;

//**************************************************************************
//    PCE cartridges Interface
//**************************************************************************

//-------------------------------------------------
//  device_pce_cart_interface - constructor
//-------------------------------------------------

device_pce_cart_interface::device_pce_cart_interface(const machine_config &mconfig, device_t &device)
	: device_slot_card_interface(mconfig, device),
		m_rom(NULL),
		m_ram(NULL),
		m_rom_size(0),
		m_ram_size(0)
{
}


//-------------------------------------------------
//  ~device_pce_cart_interface - destructor
//-------------------------------------------------

device_pce_cart_interface::~device_pce_cart_interface()
{
}

//-------------------------------------------------
//  rom_alloc - alloc the space for the cart
//-------------------------------------------------

void device_pce_cart_interface::rom_alloc(running_machine &machine, UINT32 size)
{
	if (m_rom == NULL)
	{
		m_rom = auto_alloc_array_clear(machine, UINT8, size);
		m_rom_size = size;
	}
}


//-------------------------------------------------
//  ram_alloc - alloc the space for the ram
//-------------------------------------------------

void device_pce_cart_interface::ram_alloc(running_machine &machine, UINT32 size)
{
	if (m_ram == NULL)
	{
		m_ram = auto_alloc_array_clear(machine, UINT8, size);
		m_ram_size = size;
		state_save_register_item_pointer(machine, "PCE_CART", this->device().tag(), 0, m_ram, m_ram_size);
	}
}

//-------------------------------------------------
//  rom_map_setup - setup map of rom banks in 128K
//  blocks, so to simplify ROM access to mirror
//-------------------------------------------------

void device_pce_cart_interface::rom_map_setup(UINT32 size)
{
	int i;

	if (size == 0x60000)
	{
		// HuCard 384K are mapped with mirrored pieces
		rom_bank_map[0] = 0;
		rom_bank_map[1] = 1;
		rom_bank_map[2] = 0;
		rom_bank_map[3] = 1;
		rom_bank_map[4] = 2;
		rom_bank_map[5] = 2;
		rom_bank_map[6] = 2;
		rom_bank_map[7] = 2;
	}
	else
	{
		// setup the rom_bank_map array to faster ROM read
		for (i = 0; i < size / 0x20000 && i < 8; i++)
			rom_bank_map[i] = i;
		
		// fill up remaining blocks with mirrors
		while (i % 8)
		{
			int j = 0, repeat_banks;
			while ((i % (8 >> j)) && j < 3)
				j++;
			repeat_banks = i % (8 >> (j - 1));
			for (int k = 0; k < repeat_banks; k++)
				rom_bank_map[i + k] = rom_bank_map[i + k - repeat_banks];
			i += repeat_banks;
		}
	}
	// check bank map!
//	for (i = 0; i < 8; i++)
//	{
//		printf("bank %3d = %3d\t", i, rom_bank_map[i]);
//	}
}


//**************************************************************************
//  LIVE DEVICE
//**************************************************************************

//-------------------------------------------------
//  pce_cart_slot_device - constructor
//-------------------------------------------------
pce_cart_slot_device::pce_cart_slot_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock) :
						device_t(mconfig, PCE_CART_SLOT, "PCE & TG16 Cartridge Slot", tag, owner, clock),
						device_image_interface(mconfig, *this),
						device_slot_interface(mconfig, *this),
						m_interface("pce_cart"),
						m_type(PCE_STD)
{
}


//-------------------------------------------------
//  pce_cart_slot_device - destructor
//-------------------------------------------------

pce_cart_slot_device::~pce_cart_slot_device()
{
}

//-------------------------------------------------
//  device_start - device-specific startup
//-------------------------------------------------

void pce_cart_slot_device::device_start()
{
	m_cart = dynamic_cast<device_pce_cart_interface *>(get_card_device());
}

//-------------------------------------------------
//  device_config_complete - perform any
//  operations now that the configuration is
//  complete
//-------------------------------------------------

void pce_cart_slot_device::device_config_complete()
{
	// set brief and instance name
	update_names();
}


//-------------------------------------------------
//  PCE PCB
//-------------------------------------------------

struct pce_slot
{
	int                     pcb_id;
	const char              *slot_option;
};

// Here, we take the feature attribute from .xml (i.e. the PCB name) and we assign a unique ID to it
static const pce_slot slot_list[] =
{
	{ PCE_STD, "rom" },
	{ PCE_CDSYS3U, "cdsys3u" },
	{ PCE_CDSYS3J, "cdsys3j" },
	{ PCE_POPULOUS, "populous" },
	{ PCE_SF2, "sf2" },
};

static int pce_get_pcb_id(const char *slot)
{
	for (int i = 0; i < ARRAY_LENGTH(slot_list); i++)
	{
		if (!mame_stricmp(slot_list[i].slot_option, slot))
			return slot_list[i].pcb_id;
	}

	return 0;
}

static const char *pce_get_slot(int type)
{
	for (int i = 0; i < ARRAY_LENGTH(slot_list); i++)
	{
		if (slot_list[i].pcb_id == type)
			return slot_list[i].slot_option;
	}

	return "rom";
}


/*-------------------------------------------------
 call load
 -------------------------------------------------*/

bool pce_cart_slot_device::call_load()
{
	if (m_cart)
	{
		UINT32 offset = 0;
		UINT32 len = (software_entry() == NULL) ? length() : get_software_region_length("rom");
		UINT8 *ROM;
		
		// From fullpath, check for presence of a header and skip it
		if (software_entry() == NULL && (len % 0x4000) == 512)
		{
			logerror("Rom-header found, skipping\n");
			offset = 512;
			len -= offset;
			fseek(offset, SEEK_SET);
		}
		
		m_cart->rom_alloc(machine(), len);
		ROM = m_cart->get_rom_base();

		if (software_entry() == NULL)
			fread(ROM, len);
		else
			memcpy(ROM, get_software_region("rom"), len);

		// check for encryption (US carts)
		if (ROM[0x1fff] < 0xe0)
		{
			UINT8 decrypted[256];
			
			/* Initialize decryption table */
			for (int i = 0; i < 256; i++)
				decrypted[i] = ((i & 0x01) << 7) | ((i & 0x02) << 5) | ((i & 0x04) << 3) | ((i & 0x08) << 1) | ((i & 0x10) >> 1) | ((i & 0x20 ) >> 3) | ((i & 0x40) >> 5) | ((i & 0x80) >> 7);
			
			/* Decrypt ROM image */
			for (int i = 0; i < len; i++)
				ROM[i] = decrypted[ROM[i]];
		}

		m_cart->rom_map_setup(len);

		if (software_entry() == NULL)
			m_type = get_cart_type(ROM, len);			
		else
		{
			const char *pcb_name = get_feature("slot");
			if (pcb_name)
				m_type = pce_get_pcb_id(pcb_name);
		}	
		//printf("Type: %s\n", pce_get_slot(m_type));

		if (m_type == PCE_POPULOUS)
			m_cart->ram_alloc(machine(), 0x8000);
		if (m_type == PCE_CDSYS3J || m_type == PCE_CDSYS3U)
			m_cart->ram_alloc(machine(), 0x30000);

		return IMAGE_INIT_PASS;
	}

	return IMAGE_INIT_PASS;
}


/*-------------------------------------------------
 call_unload
 -------------------------------------------------*/

void pce_cart_slot_device::call_unload()
{
}


/*-------------------------------------------------
 call softlist load
 -------------------------------------------------*/

bool pce_cart_slot_device::call_softlist_load(char *swlist, char *swname, rom_entry *start_entry)
{
	load_software_part_region(this, swlist, swname, start_entry );
	return TRUE;
}



/*-------------------------------------------------
 get_cart_type - code to detect NVRAM type from 
 fullpath
 -------------------------------------------------*/

int pce_cart_slot_device::get_cart_type(UINT8 *ROM, UINT32 len)
{
	int type = PCE_STD;

	/* Check for Street fighter 2 */
	if (len == 0x280000)
		type = PCE_SF2;
	
	/* Check for Populous */
	if (len >= 0x1f26 + 8 && !memcmp(ROM + 0x1f26, "POPULOUS", 8))
		type = PCE_POPULOUS;
	
	// Check for CD system card v3 which adds on-cart RAM to the system
	if (!memcmp(ROM + 0x3FFB6, "PC Engine CD-ROM SYSTEM", 23))
	{
		/* Check if 192KB additional system card ram should be used */
		if(!memcmp(ROM + 0x29D1, "VER. 3.", 7))         { type = PCE_CDSYS3J; } // JP version
		else if(!memcmp(ROM + 0x29C4, "VER. 3.", 7 ))   { type = PCE_CDSYS3U; } // US version
	}

	return type;
}


/*-------------------------------------------------
 get default card software
 -------------------------------------------------*/

const char * pce_cart_slot_device::get_default_card_software(const machine_config &config, emu_options &options)
{
	if (open_image_file(options))
	{
		const char *slot_string = "rom";
		UINT32 len = core_fsize(m_file);
		UINT8 *ROM = global_alloc_array(UINT8, len);
		int type;

		core_fread(m_file, ROM, len);

		type = get_cart_type(ROM, len);
		slot_string = pce_get_slot(type);

		//printf("type: %s\n", slot_string);
		global_free(ROM);
		clear();

		return slot_string;
	}

	return software_get_default_slot(config, options, this, "rom");
}

/*-------------------------------------------------
 read
 -------------------------------------------------*/

READ8_MEMBER(pce_cart_slot_device::read_cart)
{
	if (m_cart)
		return m_cart->read_cart(space, offset);
	else
		return 0xff;
}

/*-------------------------------------------------
 write
 -------------------------------------------------*/

WRITE8_MEMBER(pce_cart_slot_device::write_cart)
{
	if (m_cart)
		m_cart->write_cart(space, offset, data);
}


/*-------------------------------------------------
 Internal header logging
 -------------------------------------------------*/

void pce_cart_slot_device::internal_header_logging(UINT8 *ROM, UINT32 len)
{
}