summaryrefslogtreecommitdiffstatshomepage
path: root/src/mame/drivers/beta.cpp
blob: 48504cb85bca004b7b0233e2759173ea5c8a3c53 (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
// license:BSD-3-Clause
// copyright-holders:Curt Coder
/***************************************************************************

    Beta Computer

    http://retro.hansotten.nl/index.php?page=beta-computer

    When first started, press G to begin.

    Pasting:
        0-F : as is
        M (inc) : ^
        AD : -
        DA : =
        GO : X

    Test Paste:
        X-0011=11^22^33^44^55^66^77^88^99^-0011
        Now press M to confirm the data has been entered.

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

/*

    TODO:

    - verify whether feeding a 0xff-filled 2K binary file as cart allows
      to write back correctly EPROM or not

*/

#include "emu.h"
#include "cpu/m6502/m6502.h"
#include "machine/mos6530n.h"
#include "machine/ram.h"
#include "sound/speaker.h"

#include "bus/generic/slot.h"
#include "bus/generic/carts.h"

#include "beta.lh"

#define SCREEN_TAG      "screen"
#define M6502_TAG       "m6502"
#define M6532_TAG       "m6532"
#define EPROM_TAG       "eprom"
//#define SPEAKER_TAG       "b237"

class beta_state : public driver_device
{
public:
	beta_state(const machine_config &mconfig, device_type type, const char *tag)
		: driver_device(mconfig, type, tag),
		m_maincpu(*this, M6502_TAG),
		m_speaker(*this, "speaker"),
		m_eprom(*this, EPROM_TAG),
		m_q6(*this, "Q6"),
		m_q7(*this, "Q7"),
		m_q8(*this, "Q8"),
		m_q9(*this, "Q9")
	{ }

	required_device<cpu_device> m_maincpu;
	required_device<speaker_sound_device> m_speaker;
	required_device<generic_slot_device> m_eprom;
	required_ioport m_q6;
	required_ioport m_q7;
	required_ioport m_q8;
	required_ioport m_q9;

	virtual void machine_start() override;

	DECLARE_READ8_MEMBER( riot_pa_r );
	DECLARE_WRITE8_MEMBER( riot_pa_w );
	DECLARE_READ8_MEMBER( riot_pb_r );
	DECLARE_WRITE8_MEMBER( riot_pb_w );
	DECLARE_INPUT_CHANGED_MEMBER( trigger_reset );

	DECLARE_DEVICE_IMAGE_LOAD_MEMBER( beta_eprom );
	DECLARE_DEVICE_IMAGE_UNLOAD_MEMBER( beta_eprom );

	/* EPROM state */
	int m_eprom_oe;
	int m_eprom_ce;
	UINT16 m_eprom_addr;
	UINT8 m_eprom_data;
	UINT8 m_old_data;
	dynamic_buffer m_eprom_rom;

	/* display state */
	UINT8 m_ls145_p;
	UINT8 m_segment;

	emu_timer *m_led_refresh_timer;
	TIMER_CALLBACK_MEMBER(led_refresh);
};


/* Memory Maps */

static ADDRESS_MAP_START( beta_mem, AS_PROGRAM, 8, beta_state )
	AM_RANGE(0x0000, 0x007f) AM_MIRROR(0x7f00) AM_DEVICE(M6532_TAG, mos6532_t, ram_map)
	AM_RANGE(0x0080, 0x00ff) AM_MIRROR(0x7f00) AM_DEVICE(M6532_TAG, mos6532_t, io_map)
	AM_RANGE(0x8000, 0x87ff) AM_MIRROR(0x7800) AM_ROM
ADDRESS_MAP_END

/* Input Ports */

INPUT_CHANGED_MEMBER( beta_state::trigger_reset )
{
	m_maincpu->set_input_line(INPUT_LINE_RESET, newval ? CLEAR_LINE : ASSERT_LINE);
}

static INPUT_PORTS_START( beta )
	PORT_START("Q6")
	PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_A) PORT_CHAR('A')
	PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_1) PORT_CHAR('1')
	PORT_BIT( 0x04, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_4) PORT_CHAR('4')
	PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_7) PORT_CHAR('7')
	PORT_BIT( 0x10, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("GO") PORT_CODE(KEYCODE_G) PORT_CODE(KEYCODE_X) PORT_CHAR('X')
	PORT_BIT( 0xe0, IP_ACTIVE_LOW, IPT_UNUSED )

	PORT_START("Q7")
	PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_0) PORT_CHAR('0')
	PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_2) PORT_CHAR('2')
	PORT_BIT( 0x04, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_5) PORT_CHAR('5')
	PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_8) PORT_CHAR('8')
	PORT_BIT( 0x10, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_M) PORT_CODE(KEYCODE_UP) PORT_CHAR('^')
	PORT_BIT( 0xe0, IP_ACTIVE_LOW, IPT_UNUSED )

	PORT_START("Q8")
	PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_B) PORT_CHAR('B')
	PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_3) PORT_CHAR('3')
	PORT_BIT( 0x04, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_6) PORT_CHAR('6')
	PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_9) PORT_CHAR('9')
	PORT_BIT( 0x10, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("DA") PORT_CODE(KEYCODE_EQUALS) PORT_CHAR('=')
	PORT_BIT( 0xe0, IP_ACTIVE_LOW, IPT_UNUSED )

	PORT_START("Q9")
	PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_C) PORT_CHAR('C')
	PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_D) PORT_CHAR('D')
	PORT_BIT( 0x04, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_E) PORT_CHAR('E')
	PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_CODE(KEYCODE_F) PORT_CHAR('F')
	PORT_BIT( 0x10, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("AD") PORT_CODE(KEYCODE_MINUS) PORT_CHAR('-')
	PORT_BIT( 0xe0, IP_ACTIVE_LOW, IPT_UNUSED )

	PORT_START("SPECIAL")
	PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_KEYBOARD ) PORT_NAME("RESET") PORT_CODE(KEYCODE_R) PORT_CHANGED_MEMBER(DEVICE_SELF, beta_state, trigger_reset, 0)
INPUT_PORTS_END

/* M6532 Interface */

TIMER_CALLBACK_MEMBER(beta_state::led_refresh)
{
	if (m_ls145_p < 6)
	{
		machine().output().set_digit_value(m_ls145_p, m_segment);
	}
}

READ8_MEMBER( beta_state::riot_pa_r )
{
	/*

	    bit     description

	    PA0     2716 D0, segment D, key bit 0
	    PA1     2716 D1, segment E, key bit 1
	    PA2     2716 D2, segment C, key bit 2
	    PA3     2716 D3, segment G, key bit 3
	    PA4     2716 D4, segment F, key bit 4
	    PA5     2716 D5, segment B
	    PA6     2716 D6, segment A
	    PA7     2716 D7

	*/

	UINT8 data = 0xff;

	switch (m_ls145_p)
	{
	case 6: data &= m_q6->read(); break;
	case 7: data &= m_q7->read(); break;
	case 8: data &= m_q8->read(); break;
	case 9: data &= m_q9->read(); break;
	default:
		if (!m_eprom_oe && !m_eprom_ce)
		{
			data = m_eprom_rom[m_eprom_addr & 0x7ff];
			popmessage("EPROM read %04x = %02x\n", m_eprom_addr & 0x7ff, data);
		}
	}

	return data;
}

WRITE8_MEMBER( beta_state::riot_pa_w )
{
	/*

	    bit     description

	    PA0     2716 D0, segment D, key bit 0
	    PA1     2716 D1, segment E, key bit 1
	    PA2     2716 D2, segment C, key bit 2
	    PA3     2716 D3, segment G, key bit 3
	    PA4     2716 D4, segment F, key bit 4
	    PA5     2716 D5, segment B
	    PA6     2716 D6, segment A
	    PA7     2716 D7

	*/

//  logerror("PA %02x\n", data);

	/* display */
	m_segment = BITSWAP8(data, 7, 3, 4, 1, 0, 2, 5, 6) & 0x7f;
	m_led_refresh_timer->adjust(attotime::from_usec(70));

	/* EPROM data */
	m_eprom_data = data;
}

READ8_MEMBER( beta_state::riot_pb_r )
{
	return 0;
}

WRITE8_MEMBER( beta_state::riot_pb_w )
{
	/*

	    bit     description

	    PB0     74LS145 P0
	    PB1     74LS145 P1
	    PB2     74LS145 P2
	    PB3     74LS145 P3, 74LS164 D
	    PB4     loudspeaker, data led
	    PB5     address led, 74LS164 CP
	    PB6     2716 _OE
	    PB7     2716 _CE

	*/

	//logerror("PB %02x %02x\n", data, olddata);

	/* display */
	m_ls145_p = data & 0x0f;

	/* speaker */
	m_speaker->level_w(!BIT(data, 4));

	/* address led */
	machine().output().set_led_value(0, BIT(data, 5));

	/* data led */
	machine().output().set_led_value(1, !BIT(data, 5));

	/* EPROM address shift */
	if (!BIT(m_old_data, 5) && BIT(data, 5))
	{
		m_eprom_addr <<= 1;
		m_eprom_addr |= BIT(m_old_data, 3);
	}

	/* EPROM output enable */
	m_eprom_oe = BIT(data, 6);

	/* EPROM chip enable */
	m_eprom_ce = BIT(data, 7);

	if (BIT(data, 6) && (!BIT(m_old_data, 7) && BIT(data, 7)))
	{
		popmessage("EPROM write %04x = %02x\n", m_eprom_addr & 0x7ff, m_eprom_data);
		m_eprom_rom[m_eprom_addr & 0x7ff] &= m_eprom_data;
	}

	m_old_data = data;
}

/* EPROM socket */

DEVICE_IMAGE_LOAD_MEMBER( beta_state, beta_eprom )
{
	UINT32 size = m_eprom->common_get_size("rom");

	if (size != 0x800)
	{
		image.seterror(IMAGE_ERROR_UNSPECIFIED, "Unsupported cartridge size");
		return IMAGE_INIT_FAIL;
	}

	m_eprom->rom_alloc(size, GENERIC_ROM8_WIDTH, ENDIANNESS_LITTLE);
	m_eprom->common_load_rom(m_eprom->get_rom_base(), size, "rom");

	return IMAGE_INIT_PASS;
}

DEVICE_IMAGE_UNLOAD_MEMBER( beta_state, beta_eprom )
{
	if (image.software_entry() == nullptr)
		image.fwrite(&m_eprom_rom[0], 0x800);
}

/* Machine Initialization */

void beta_state::machine_start()
{
	m_led_refresh_timer = machine().scheduler().timer_alloc(timer_expired_delegate(FUNC(beta_state::led_refresh),this));

	m_eprom_rom.resize(0x800);

	if (!m_eprom->exists())
		memset(&m_eprom_rom[0], 0xff, 0x800);
	else
	{
		std::string region_tag;
		memcpy(&m_eprom_rom[0], memregion(region_tag.assign(m_eprom->tag()).append(GENERIC_ROM_REGION_TAG).c_str())->base(), 0x800);
	}

	// state saving
	save_item(NAME(m_eprom_oe));
	save_item(NAME(m_eprom_ce));
	save_item(NAME(m_eprom_addr));
	save_item(NAME(m_eprom_data));
	save_item(NAME(m_old_data));
	save_item(NAME(m_eprom_rom));
	save_item(NAME(m_ls145_p));
	save_item(NAME(m_segment));
}

/* Machine Driver */

static MACHINE_CONFIG_START( beta, beta_state )
	/* basic machine hardware */
	MCFG_CPU_ADD(M6502_TAG, M6502, XTAL_4MHz/4)
	MCFG_CPU_PROGRAM_MAP(beta_mem)

	/* video hardware */
	MCFG_DEFAULT_LAYOUT( layout_beta )

	/* sound hardware */
	MCFG_SPEAKER_STANDARD_MONO("mono")
	MCFG_SOUND_ADD("speaker", SPEAKER_SOUND, 0)
	MCFG_SOUND_ROUTE(ALL_OUTPUTS, "mono", 0.25)

	/* devices */
	MCFG_DEVICE_ADD(M6532_TAG, MOS6532n, XTAL_4MHz/4)
	MCFG_MOS6530n_IN_PA_CB(READ8(beta_state, riot_pa_r))
	MCFG_MOS6530n_OUT_PA_CB(WRITE8(beta_state, riot_pa_w))
	MCFG_MOS6530n_IN_PB_CB(READ8(beta_state, riot_pb_r))
	MCFG_MOS6530n_OUT_PB_CB(WRITE8(beta_state, riot_pb_w))
	MCFG_MOS6530n_IRQ_CB(INPUTLINE(M6502_TAG, M6502_IRQ_LINE))

	/* EPROM socket */
	MCFG_GENERIC_CARTSLOT_ADD(EPROM_TAG, generic_plain_slot, nullptr)
	MCFG_GENERIC_EXTENSIONS("bin,rom")
	MCFG_GENERIC_LOAD(beta_state, beta_eprom)
	MCFG_GENERIC_UNLOAD(beta_state, beta_eprom)

	/* internal ram */
	MCFG_RAM_ADD(RAM_TAG)
	MCFG_RAM_DEFAULT_SIZE("256")
MACHINE_CONFIG_END

/* ROMs */

ROM_START( beta )
	ROM_REGION( 0x10000, M6502_TAG, 0 )
	ROM_LOAD( "beta.rom", 0x8000, 0x0800, CRC(d42fdb17) SHA1(595225a0cd43dd76c46b2aff6c0f27d5991cc4f0))
ROM_END

/* System Drivers */

/*    YEAR  NAME    PARENT  COMPAT  MACHINE INPUT   INIT    COMPANY    FULLNAME    FLAGS */
COMP( 1984, beta,   0,      0,      beta,   beta, driver_device,   0,    "Pitronics", "Beta", MACHINE_SUPPORTS_SAVE )