summaryrefslogtreecommitdiffstatshomepage
path: root/src/mess/machine/lviv.c
blob: c29cb41a4f43a45d77344de3a11e8faec014f5c1 (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
// license:???
// copyright-holders:???
/***************************************************************************

  machine.c

  Functions to emulate general aspects of PK-01 Lviv (RAM, ROM, interrupts,
  I/O ports)

  Krzysztof Strzecha

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

#include "emu.h"
#include "imagedev/cassette.h"
#include "imagedev/snapquik.h"
#include "cpu/i8085/i8085.h"
#include "machine/i8255.h"
#include "includes/lviv.h"
#include "sound/speaker.h"
#include "machine/ram.h"

#define LVIV_SNAPSHOT_SIZE  82219





void lviv_state::lviv_update_memory ()
{
	UINT8 *ram = m_ram->pointer();

	if (m_ppi_port_outputs[0][2] & 0x02)
	{
		membank("bank1")->set_base(ram);
		membank("bank2")->set_base(ram + 0x4000);
	}
	else
	{
		membank("bank1")->set_base(ram + 0x8000);
		membank("bank2")->set_base(ram + 0xc000);
	}
}

INPUT_CHANGED_MEMBER(lviv_state::lviv_reset)
{
	machine().schedule_soft_reset();
}

READ8_MEMBER(lviv_state::lviv_ppi_0_porta_r)
{
	return 0xff;
}

READ8_MEMBER(lviv_state::lviv_ppi_0_portb_r)
{
	return 0xff;
}

READ8_MEMBER(lviv_state::lviv_ppi_0_portc_r)
{
	UINT8 data = m_ppi_port_outputs[0][2] & 0x0f;
	if (m_cassette->input() > 0.038)
		data |= 0x10;
	if (m_ppi_port_outputs[0][0] & ioport("JOY")->read())
		data |= 0x80;
	return data;
}

WRITE8_MEMBER(lviv_state::lviv_ppi_0_porta_w)
{
	m_ppi_port_outputs[0][0] = data;
}

WRITE8_MEMBER(lviv_state::lviv_ppi_0_portb_w)
{
	m_ppi_port_outputs[0][1] = data;
	lviv_update_palette(data&0x7f);
}

WRITE8_MEMBER(lviv_state::lviv_ppi_0_portc_w)/* tape in/out, video memory on/off */
{
	m_ppi_port_outputs[0][2] = data;
	if (m_ppi_port_outputs[0][1]&0x80)
		m_speaker->level_w(data & 0x01);
	m_cassette->output((data & 0x01) ? -1.0 : 1.0);
	lviv_update_memory();
}

READ8_MEMBER(lviv_state::lviv_ppi_1_porta_r)
{
	return 0xff;
}

READ8_MEMBER(lviv_state::lviv_ppi_1_portb_r)/* keyboard reading */
{
	return  ((m_ppi_port_outputs[1][0] & 0x01) ? 0xff : ioport("KEY0")->read()) &
		((m_ppi_port_outputs[1][0] & 0x02) ? 0xff : ioport("KEY1")->read()) &
		((m_ppi_port_outputs[1][0] & 0x04) ? 0xff : ioport("KEY2")->read()) &
		((m_ppi_port_outputs[1][0] & 0x08) ? 0xff : ioport("KEY3")->read()) &
		((m_ppi_port_outputs[1][0] & 0x10) ? 0xff : ioport("KEY4")->read()) &
		((m_ppi_port_outputs[1][0] & 0x20) ? 0xff : ioport("KEY5")->read()) &
		((m_ppi_port_outputs[1][0] & 0x40) ? 0xff : ioport("KEY6")->read()) &
		((m_ppi_port_outputs[1][0] & 0x80) ? 0xff : ioport("KEY7")->read());
}

READ8_MEMBER(lviv_state::lviv_ppi_1_portc_r)/* keyboard reading */
{
	return  ((m_ppi_port_outputs[1][2] & 0x01) ? 0xff : ioport("KEY8")->read()) &
		((m_ppi_port_outputs[1][2] & 0x02) ? 0xff : ioport("KEY9" )->read()) &
		((m_ppi_port_outputs[1][2] & 0x04) ? 0xff : ioport("KEY10")->read()) &
		((m_ppi_port_outputs[1][2] & 0x08) ? 0xff : ioport("KEY11")->read());
}

WRITE8_MEMBER(lviv_state::lviv_ppi_1_porta_w)/* kayboard scaning */
{
	m_ppi_port_outputs[1][0] = data;
}

WRITE8_MEMBER(lviv_state::lviv_ppi_1_portb_w)
{
	m_ppi_port_outputs[1][1] = data;
}

WRITE8_MEMBER(lviv_state::lviv_ppi_1_portc_w)/* kayboard scaning */
{
	m_ppi_port_outputs[1][2] = data;
}


/* I/O */
READ8_MEMBER(lviv_state::lviv_io_r)
{
	if (m_startup_mem_map)
	{
		return 0;   /* ??? */
	}
	else
	{
		switch ((offset >> 4) & 0x3)
		{
		case 0:
			return machine().device<i8255_device>("ppi8255_0")->read(space, offset & 3);

		case 1:
			return machine().device<i8255_device>("ppi8255_1")->read(space, offset & 3);

		case 2:
		case 3:
		default:
			/* reserved for extension? */
			return 0;   /* ??? */
		}
	}
}

WRITE8_MEMBER(lviv_state::lviv_io_w)
{
	address_space &cpuspace = m_maincpu->space(AS_PROGRAM);
	if (m_startup_mem_map)
	{
		UINT8 *ram = m_ram->pointer();

		m_startup_mem_map = 0;

		cpuspace.install_write_bank(0x0000, 0x3fff, "bank1");
		cpuspace.install_write_bank(0x4000, 0x7fff, "bank2");
		cpuspace.install_write_bank(0x8000, 0xbfff, "bank3");
		cpuspace.unmap_write(0xC000, 0xffff);

		membank("bank1")->set_base(ram);
		membank("bank2")->set_base(ram + 0x4000);
		membank("bank3")->set_base(ram + 0x8000);
		membank("bank4")->set_base(memregion("maincpu")->base() + 0x010000);
	}
	else
	{
		switch ((offset >> 4) & 0x3)
		{
		case 0:
			machine().device<i8255_device>("ppi8255_0")->write(space, offset & 3, data);
			break;

		case 1:
			machine().device<i8255_device>("ppi8255_1")->write(space, offset & 3, data);
			break;

		case 2:
		case 3:
			/* reserved for extension? */
			break;
		}
	}
}


void lviv_state::machine_reset()
{
	address_space &space = m_maincpu->space(AS_PROGRAM);
	UINT8 *mem;

	m_video_ram = m_ram->pointer() + 0xc000;

	m_startup_mem_map = 1;

	space.unmap_write(0x0000, 0x3fff);
	space.unmap_write(0x4000, 0x7fff);
	space.unmap_write(0x8000, 0xbfff);
	space.unmap_write(0xC000, 0xffff);

	mem = memregion("maincpu")->base();
	membank("bank1")->set_base(mem + 0x010000);
	membank("bank2")->set_base(mem + 0x010000);
	membank("bank3")->set_base(mem + 0x010000);
	membank("bank4")->set_base(mem + 0x010000);

	/*machine().scheduler().timer_pulse(TIME_IN_NSEC(200), FUNC(lviv_draw_pixel));*/

	/*memset(m_ram->pointer(), 0, sizeof(unsigned char)*0xffff);*/
}


/*******************************************************************************
Lviv snapshot files (SAV)
-------------------------

00000 - 0000D:  'LVOV/DUMP/2.0/' (like LVT-header)
0000E - 0000F:  'H+' (something additional)
00010           00h
00011 - 0C010:  RAM (0000 - BFFF)
0C011 - 10010:  ROM (C000 - FFFF)
10011 - 14010:  Video RAM (4000 - 7FFF)
14011 - 14110:  Ports map (00 - FF)
14111 - 1411C:  Registers (B,C,D,E,H,L,A,F,SP,PC)
1411D - 1412A:  ??? (something additional)
*******************************************************************************/

void lviv_state::lviv_setup_snapshot (UINT8 * data)
{
	unsigned char lo,hi;

	/* Set registers */
	lo = data[0x14112] & 0x0ff;
	hi = data[0x14111] & 0x0ff;
	m_maincpu->set_state_int(I8085_BC, (hi << 8) | lo);
	lo = data[0x14114] & 0x0ff;
	hi = data[0x14113] & 0x0ff;
	m_maincpu->set_state_int(I8085_DE, (hi << 8) | lo);
	lo = data[0x14116] & 0x0ff;
	hi = data[0x14115] & 0x0ff;
	m_maincpu->set_state_int(I8085_HL, (hi << 8) | lo);
	lo = data[0x14118] & 0x0ff;
	hi = data[0x14117] & 0x0ff;
	m_maincpu->set_state_int(I8085_AF, (hi << 8) | lo);
	lo = data[0x14119] & 0x0ff;
	hi = data[0x1411a] & 0x0ff;
	m_maincpu->set_state_int(I8085_SP, (hi << 8) | lo);
	lo = data[0x1411b] & 0x0ff;
	hi = data[0x1411c] & 0x0ff;
	m_maincpu->set_state_int(I8085_PC, (hi << 8) | lo);

	/* Memory dump */
	memcpy (m_ram->pointer(), data+0x0011, 0xc000);
	memcpy (m_ram->pointer()+0xc000, data+0x10011, 0x4000);

	/* Ports */
	m_ppi_port_outputs[0][0] = data[0x14011+0xc0];
	m_ppi_port_outputs[0][1] = data[0x14011+0xc1];
	lviv_update_palette(m_ppi_port_outputs[0][1]&0x7f);
	m_ppi_port_outputs[0][2] = data[0x14011+0xc2];
	lviv_update_memory();
}

void lviv_state::dump_registers()
{
	logerror("PC   = %04x\n", (unsigned) m_maincpu->state_int(I8085_PC));
	logerror("SP   = %04x\n", (unsigned) m_maincpu->state_int(I8085_SP));
	logerror("AF   = %04x\n", (unsigned) m_maincpu->state_int(I8085_AF));
	logerror("BC   = %04x\n", (unsigned) m_maincpu->state_int(I8085_BC));
	logerror("DE   = %04x\n", (unsigned) m_maincpu->state_int(I8085_DE));
	logerror("HL   = %04x\n", (unsigned) m_maincpu->state_int(I8085_HL));
}

int lviv_state::lviv_verify_snapshot (UINT8 * data, UINT32 size)
{
	const char* tag = "LVOV/DUMP/2.0/";

	if( strncmp( tag, (char*)data, strlen(tag) ) )
	{
		logerror("Not a Lviv snapshot\n");
		return IMAGE_VERIFY_FAIL;
	}

	if (size != LVIV_SNAPSHOT_SIZE)
	{
		logerror ("Incomplete snapshot file\n");
		return IMAGE_VERIFY_FAIL;
	}

	logerror("returning ID_OK\n");
	return IMAGE_VERIFY_PASS;
}

SNAPSHOT_LOAD_MEMBER( lviv_state, lviv )
{
	dynamic_buffer lviv_snapshot_data(LVIV_SNAPSHOT_SIZE);

	image.fread( &lviv_snapshot_data[0], LVIV_SNAPSHOT_SIZE);

	if(lviv_verify_snapshot(&lviv_snapshot_data[0], snapshot_size) == IMAGE_VERIFY_FAIL)
	{
		return IMAGE_INIT_FAIL;
	}

	lviv_setup_snapshot (&lviv_snapshot_data[0]);

	dump_registers();

	logerror("Snapshot file loaded\n");
	return IMAGE_INIT_PASS;
}