summaryrefslogtreecommitdiffstatshomepage
path: root/src/mame/machine/tatsumi.c
blob: f261a96abf7b7f0f7b08b6bf7d1255467c3019ec (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
#include "driver.h"
#include "tatsumi.h"
#include "sound/2151intf.h"
#include "sound/okim6295.h"

/*static*/ UINT16 tatsumi_control_word=0;
static UINT16 tatsumi_last_control=0;
static UINT16 tatsumi_last_irq=0;
static UINT8 apache3_adc;

UINT16 *tatsumi_68k_ram;
UINT8 *apache3_z80_ram;

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

void tatsumi_reset(void)
{
	tatsumi_last_irq=0;
	tatsumi_last_control=0;
	tatsumi_control_word=0;
	apache3_adc=0;

	state_save_register_global(tatsumi_last_irq);
	state_save_register_global(tatsumi_last_control);
	state_save_register_global(tatsumi_control_word);
	state_save_register_global(apache3_adc);
}

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

READ16_HANDLER( apache3_bank_r )
{
	return tatsumi_control_word;
}

WRITE16_HANDLER( apache3_bank_w )
{
	/*
        0x8000  - Set when accessing palette ram (not implemented, perhaps blank screen?)
        0x0080  - Set when accessing IO cpu RAM/ROM (implemented as halt cpu)
        0x0060  - IOP bank to access from main cpu (0x0 = RAM, 0x20 = lower ROM, 0x60 = upper ROM)
        0x0010  - Set when accessing OBJ cpu RAM/ROM (implemented as halt cpu)
        0x000f  - OBJ bank to access from main cpu (0x8 = RAM, 0x0 to 0x7 = ROM)
    */

	COMBINE_DATA(&tatsumi_control_word);

	if (tatsumi_control_word&0x7f00)
	{
		logerror("Unknown control Word: %04x\n",tatsumi_control_word);
		cpunum_set_input_line(3, INPUT_LINE_HALT, CLEAR_LINE); // ?
	}
	if ((tatsumi_control_word&0x8)==0 && !(tatsumi_last_control&0x8))
		cpunum_set_input_line(1, INPUT_LINE_IRQ4, ASSERT_LINE);

	if (tatsumi_control_word&0x10)
		cpunum_set_input_line(1, INPUT_LINE_HALT, ASSERT_LINE);
	else
		cpunum_set_input_line(1, INPUT_LINE_HALT, CLEAR_LINE);

	if (tatsumi_control_word&0x80)
		cpunum_set_input_line(2, INPUT_LINE_HALT, ASSERT_LINE);
	else
		cpunum_set_input_line(2, INPUT_LINE_HALT, CLEAR_LINE);

	tatsumi_last_control=tatsumi_control_word;
}

WRITE16_HANDLER( apache3_irq_ack_w )
{
	cpunum_set_input_line(1, INPUT_LINE_IRQ4, CLEAR_LINE);

	if ((data&2) && (tatsumi_last_irq&2)==0)
	{
		cpunum_set_input_line(3, INPUT_LINE_HALT, ASSERT_LINE);
	}

	if ((tatsumi_last_irq&2) && (data&2)==0)
	{
		cpunum_set_input_line(3, INPUT_LINE_HALT, CLEAR_LINE);
		cpunum_set_input_line_and_vector(3, 0, HOLD_LINE, 0xc7 | 0x10);
	}

	tatsumi_last_irq=data;
}

READ16_HANDLER( apache3_v30_v20_r )
{
	UINT8 value;

	/* Each V20 byte maps to a V30 word */
	if ((tatsumi_control_word&0xe0)==0xe0)
		offset+=0xf8000; /* Upper half */
	else if ((tatsumi_control_word&0xe0)==0xc0)
		offset+=0xf0000;
	else if ((tatsumi_control_word&0xe0)==0x80)
		offset+=0x00000; // main ram
	else
		logerror("%08x: unmapped read z80 rom %08x\n",activecpu_get_pc(),offset);

	cpuintrf_push_context(2);
	value = program_read_byte(offset);
	cpuintrf_pop_context();
	return value | 0xff00;
}

WRITE16_HANDLER( apache3_v30_v20_w )
{
	if ((tatsumi_control_word&0xe0)!=0x80)
		logerror("%08x: write unmapped v30 rom %08x\n",activecpu_get_pc(),offset);

	/* Only 8 bits of the V30 data bus are connected - ignore writes to the other half */
	if (ACCESSING_LSB)
	{
		cpuintrf_push_context(2);
		program_write_byte(offset, data&0xff);
		cpuintrf_pop_context();
	}
}

READ16_HANDLER(apache3_z80_r)
{
	return apache3_z80_ram[offset];
}

WRITE16_HANDLER(apache3_z80_w)
{
	apache3_z80_ram[offset]=data&0xff;
}

READ8_HANDLER( apache3_adc_r )
{
	if (apache3_adc==0)
		return readinputport(1);
	return readinputport(2);
}

WRITE8_HANDLER( apache3_adc_w )
{
	apache3_adc=offset;
}

UINT16 apache3_a0000[16]; // TODO
static int a3counter=0; // TODO

WRITE16_HANDLER( apache3_a0000_w )
{
	if (a3counter>15) // TODO
		return;
	apache3_a0000[a3counter++]=data;
}

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

READ16_HANDLER( roundup_v30_z80_r )
{
	UINT8 value;

	/* Each Z80 byte maps to a V30 word */
	if (tatsumi_control_word&0x20)
		offset+=0x8000; /* Upper half */

	cpuintrf_push_context(2);
	value = program_read_byte(offset);
	cpuintrf_pop_context();
	return value | 0xff00;
}

WRITE16_HANDLER( roundup_v30_z80_w )
{
	/* Only 8 bits of the V30 data bus are connected - ignore writes to the other half */
	if (ACCESSING_LSB)
	{
		if (tatsumi_control_word&0x20)
			offset+=0x8000; /* Upper half of Z80 address space */

		cpuintrf_push_context(2);
		program_write_byte(offset, data&0xff);
		cpuintrf_pop_context();
	}
}


WRITE16_HANDLER( roundup5_control_w )
{
	COMBINE_DATA(&tatsumi_control_word);

	if (tatsumi_control_word&0x10)
		cpunum_set_input_line(1, INPUT_LINE_HALT, ASSERT_LINE);
	else
		cpunum_set_input_line(1, INPUT_LINE_HALT, CLEAR_LINE);

	if (tatsumi_control_word&0x4)
		cpunum_set_input_line(2, INPUT_LINE_HALT, ASSERT_LINE);
	else
		cpunum_set_input_line(2, INPUT_LINE_HALT, CLEAR_LINE);

//  if (offset==1 && (tatsumi_control_w&0xfeff)!=(last_bank&0xfeff))
//      logerror("%08x:  Changed bank to %04x (%d)\n",activecpu_get_pc(),tatsumi_control_w,offset);

//todo - watchdog

	/* Bank:

        0x0017  :   OBJ banks
        0x0018  :   68000 RAM       mask 0x0380 used to save bits when writing
        0x0c10  :   68000 ROM

        0x0040  :   Z80 rom (lower half) mapped to 0x10000
        0x0060  :   Z80 rom (upper half) mapped to 0x10000

        0x0100  :   watchdog.

        0x0c00  :   vram bank (bits 0x7000 also set when writing vram)

        0x8000  :   set whenever writing to palette ram?

        Changed bank to 0060 (0)
    */

	if ((tatsumi_control_word&0x8)==0 && !(tatsumi_last_control&0x8))
		cpunum_set_input_line(1, INPUT_LINE_IRQ4, ASSERT_LINE);
//  if (tatsumi_control_w&0x200)
//      cpu_set_reset_line(1, CLEAR_LINE);
//  else
//      cpu_set_reset_line(1, ASSERT_LINE);

//  if ((tatsumi_control_w&0x200) && (last_bank&0x200)==0)
//      logerror("68k irq\n");
//  if ((tatsumi_control_w&0x200)==0 && (last_bank&0x200)==0x200)
//      logerror("68k reset\n");

	if (tatsumi_control_word==0x3a00) {
//      cpu_set_reset_line(1, CLEAR_LINE);
	//  logerror("68k on\n");

	}

	tatsumi_last_control=tatsumi_control_word;
}

WRITE16_HANDLER( roundup5_d0000_w )
{
	COMBINE_DATA(&roundup5_d0000_ram[offset]);
//  logerror("d_68k_d0000_w %06x %04x\n",activecpu_get_pc(),data);
}

WRITE16_HANDLER( roundup5_e0000_w )
{
	/*  Bit 0x10 is road bank select,
        Bit 0x100 is used, but unknown
    */

	COMBINE_DATA(&roundup5_e0000_ram[offset]);
	cpunum_set_input_line(1, INPUT_LINE_IRQ4, CLEAR_LINE); // guess, probably wrong

//  logerror("d_68k_e0000_w %06x %04x\n",activecpu_get_pc(),data);
}

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

READ16_HANDLER(cyclwarr_control_r)
{
//  logerror("%08x:  control_r\n",activecpu_get_pc());
	return tatsumi_control_word;
}

WRITE16_HANDLER(cyclwarr_control_w)
{
	COMBINE_DATA(&tatsumi_control_word);

//  if ((tatsumi_control_word&0xfe)!=(tatsumi_last_control&0xfe))
//      logerror("%08x:  control_w %04x\n",activecpu_get_pc(),data);

/*

0x1 - watchdog
0x4 - cpu bus lock



*/

	if ((tatsumi_control_word&4)==4 && (tatsumi_last_control&4)==0) {
//      logerror("68k 2 halt\n");
		cpunum_set_input_line(1, INPUT_LINE_HALT, ASSERT_LINE);
	}

	if ((tatsumi_control_word&4)==0 && (tatsumi_last_control&4)==4) {
//      logerror("68k 2 irq go\n");
		cpunum_set_input_line(1, INPUT_LINE_HALT, CLEAR_LINE);
	}


	// hack
	if (activecpu_get_pc()==0x2c3c34) {
//      cpu_set_reset_line(1, CLEAR_LINE);
	//  logerror("hack 68k2 on\n");
	}

	tatsumi_last_control=tatsumi_control_word;
}

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

READ16_HANDLER( tatsumi_v30_68000_r )
{
	const UINT16* rom=(UINT16*)memory_region(REGION_CPU2);

logerror("%05X:68000_r(%04X),cw=%04X\n", activecpu_get_pc(), offset*2, tatsumi_control_word);
	/* Read from 68k RAM */
	if ((tatsumi_control_word&0x1f)==0x18)
	{
		// hack to make roundup 5 boot
		if (activecpu_get_pc()==0xec575)
		{
			UINT8 *dst = memory_region(REGION_CPU1);
			dst[BYTE_XOR_LE(0xec57a)]=0x46;
			dst[BYTE_XOR_LE(0xec57b)]=0x46;

			dst[BYTE_XOR_LE(0xfc520)]=0x46; //code that stops cpu after coin counter goes mad..
			dst[BYTE_XOR_LE(0xfc521)]=0x46;
			dst[BYTE_XOR_LE(0xfc522)]=0x46;
			dst[BYTE_XOR_LE(0xfc523)]=0x46;
			dst[BYTE_XOR_LE(0xfc524)]=0x46;
			dst[BYTE_XOR_LE(0xfc525)]=0x46;
		}

		return tatsumi_68k_ram[offset & 0x1fff];
	}

	/* Read from 68k ROM */
	offset+=(tatsumi_control_word&0x7)*0x8000;

	return rom[offset];
}

WRITE16_HANDLER( tatsumi_v30_68000_w )
{
	if ((tatsumi_control_word&0x1f)!=0x18)
		logerror("68k write in bank %05x\n",tatsumi_control_word);

	COMBINE_DATA(&tatsumi_68k_ram[offset]);
}

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

// Todo:  Current YM2151 doesn't seem to raise the busy flag quickly enough for the
// self-test in Tatsumi games.  Needs fixed, but hack it here for now.
READ8_HANDLER(tatsumi_hack_ym2151_r)
{
	int r=YM2151_status_port_0_r(0);

	if (activecpu_get_pc()==0x2aca || activecpu_get_pc()==0x29fe
		|| activecpu_get_pc()==0xf9721)
		return 0x80;
	return r;
}

// Todo:  Tatsumi self-test fails if OKI doesn't respond (when sound off).
// Mame really should emulate the OKI status reads even with Mame sound off.
READ8_HANDLER(tatsumi_hack_oki_r)
{
	int r=OKIM6295_status_0_r(0);

	if (activecpu_get_pc()==0x2b70 || activecpu_get_pc()==0x2bb5
		|| activecpu_get_pc()==0x2acc
		|| activecpu_get_pc()==0xf9881)
		return 0xf;
	if (activecpu_get_pc()==0x2ba3 || activecpu_get_pc()==0x2a9b || activecpu_get_pc()==0x2adc)
		return 0;
	return r;
}