summaryrefslogtreecommitdiffstatshomepage
path: root/src/mame/drivers/mmd2.cpp
blob: be145348304d4a411518e25276740034a560c0cb (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
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
// license:BSD-3-Clause
// copyright-holders:Miodrag Milanovic, Robbbert
/***************************************************************************

MMD-2 driver by Miodrag Milanovic

2009-05-12 Initial version
2011-01-12 MMD2 working [Robbbert]


http://www.cs.unc.edu/~yakowenk/classiccmp/mmd2/
Memory map:

    * 4K RAM addresses $0000..$0FFF
    * ROM addresses $D800..$E7FF
    * 256 bytes of RAM, ($FC00..$FCFF?)

DIP switches:

    * WE 0 - Write enable for addresses $0000..$03FF
    * WE 1 - Write enable for addresses $0400..$07FF
    * WE 2 - Write enable for addresses $0800..$0BFF
    * WE 3 - Write enable for addresses $0C00..$0FFF
    * SPARE - ???
    * HEX OCT - choose display and entry to be in Hexadecimal or Octal
    * PUP RESET - ???
    * EXEC USER - update binary LED's with data entry? Or not?
      (in either setting, outputs to ports 0,1,2 still show)

Operation:

    * Enter bytes on the keypad of hex digits
    * Set MSByte of address by entering it on the keypad & pressing "HIGH".
    * ... LSByte ... "LOW"
    * Change contents of memory at the selected address by entering the new value & pressing "STORE".
    * Look at adjacent memory locations with "NEXT" and "PREV".
    * Execute the program at the selected address by pressing "GO".

AUX functions:

    * BRL HI # - OFF disables BRL LO
    * BRL LO #
    * STEP #
    * SRC HI # - source for COPY/DUMP - OFF disables "DUMP" function
    * DES HI # - destination for COPY/DUMP
    * LEN HI # - length for COPY/DUMP
    * CLR TST ON - test if PROM is empty
    * POP PRM ON - program a PROM
    * DUP TST ON - test if PROM duplicated okay
    * PROM 2708/2716
    * MEM MAP RAM/ROM
    * BAUD 110/150/300/600/1200

The memory map can be rearranged by the system by using IN5, IN6, IN7.
A pair of undumped proms control what goes where on each map.
Each set of ROMs also has its own pair of PROMs.


I/O ports:
IN0: user expansion
IN1: 0-TTYIN, 1-CASSIN, 3-SW8(binary/ports), 4-SW7(reset/pup), 5-SW6(hex/oct), 6-(pup signal)
IN3: 8279 status
IN4: 8279 key
IN5: set MAP1
IN6: set MAP2
IN7: set MAP3
IN8: read eprom (in the eprom programmer)
OUT0: PORT0 LEDs
OUT1: PORT1 LEDs
OUT2: PORT2 LEDs
OUT3: 8279 control
OUT4: 8279 7-segment LED data
OUT5: TTYOUT, CASSOUT
OUT9: turn pup signal off
OUTA: programming pulse on/off (eprom programmer)

Dips:
SW1-4 hardware control of RAM being writable
SW5 not used
SW6 Control if the 7-segment displays show Octal (low) or Hex (high).
SW7 Reset only causes the cpu to perform a warm start. PUP does a cold start (Power-UP).
SW8 Control if the PORT displays echo the 7-segment displays (high), or just act as normal output ports (low).


ToDo
- Hook up WE0-3
- tty rs232 interface
- Add interrupt module (INTE LED is always on atm)
- Need software
- Probably lots of other things

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

#include "emu.h"
#include "cpu/i8085/i8085.h"
#include "machine/i8279.h"
#include "imagedev/cassette.h"
#include "speaker.h"
#include "mmd2.lh"


class mmd2_state : public driver_device
{
public:
	mmd2_state(const machine_config &mconfig, device_type type, const char *tag)
		: driver_device(mconfig, type, tag)
		, m_maincpu(*this, "maincpu")
		, m_cass(*this, "cassette")
		, m_banks(*this, "bank%u", 1U)
		, m_io_keyboard(*this, "X%u", 0)
		, m_io_dsw(*this, "DSW")
		, m_digits(*this, "digit%u", 0U)
		, m_p(*this, "p%u_%u", 0U, 0U)
		, m_led_halt(*this, "led_halt")
		, m_led_hold(*this, "led_hold")
		, m_led_inte(*this, "led_inte")
	{ }

	void mmd2(machine_config &config);

	void init_mmd2();

	DECLARE_INPUT_CHANGED_MEMBER(reset_button);

protected:
	virtual void machine_start() override;
	virtual void machine_reset() override;

private:
	DECLARE_WRITE8_MEMBER(port00_w);
	DECLARE_WRITE8_MEMBER(port01_w);
	DECLARE_WRITE8_MEMBER(port02_w);
	DECLARE_WRITE8_MEMBER(port05_w);
	DECLARE_READ8_MEMBER(port01_r);
	DECLARE_READ8_MEMBER(port13_r);
	DECLARE_READ8_MEMBER(bank_r);
	DECLARE_READ8_MEMBER(keyboard_r);
	DECLARE_WRITE8_MEMBER(scanlines_w);
	DECLARE_WRITE8_MEMBER(digit_w);
	DECLARE_WRITE8_MEMBER(status_callback);
	DECLARE_WRITE_LINE_MEMBER(inte_callback);
	DECLARE_READ_LINE_MEMBER(si);
	DECLARE_WRITE_LINE_MEMBER(so);
	void io_map(address_map &map);
	void mem_map(address_map &map);
	void reset_banks();

	uint8_t m_digit;
	required_device<i8080_cpu_device> m_maincpu;
	required_device<cassette_image_device> m_cass;
	required_memory_bank_array<8> m_banks;
	required_ioport_array<4> m_io_keyboard;
	required_ioport m_io_dsw;
	output_finder<9> m_digits;
	output_finder<3, 8> m_p;
	output_finder<> m_led_halt;
	output_finder<> m_led_hold;
	output_finder<> m_led_inte;
};


WRITE8_MEMBER( mmd2_state::port00_w )
{
	m_p[0][7] = BIT(data,7) ? 0 : 1;
	m_p[0][6] = BIT(data,6) ? 0 : 1;
	m_p[0][5] = BIT(data,5) ? 0 : 1;
	m_p[0][4] = BIT(data,4) ? 0 : 1;
	m_p[0][3] = BIT(data,3) ? 0 : 1;
	m_p[0][2] = BIT(data,2) ? 0 : 1;
	m_p[0][1] = BIT(data,1) ? 0 : 1;
	m_p[0][0] = BIT(data,0) ? 0 : 1;
}

WRITE8_MEMBER( mmd2_state::port01_w )
{
	m_p[1][7] = BIT(data,7) ? 0 : 1;
	m_p[1][6] = BIT(data,6) ? 0 : 1;
	m_p[1][5] = BIT(data,5) ? 0 : 1;
	m_p[1][4] = BIT(data,4) ? 0 : 1;
	m_p[1][3] = BIT(data,3) ? 0 : 1;
	m_p[1][2] = BIT(data,2) ? 0 : 1;
	m_p[1][1] = BIT(data,1) ? 0 : 1;
	m_p[1][0] = BIT(data,0) ? 0 : 1;
}

WRITE8_MEMBER( mmd2_state::port02_w )
{
	m_p[2][7] = BIT(data,7) ? 0 : 1;
	m_p[2][6] = BIT(data,6) ? 0 : 1;
	m_p[2][5] = BIT(data,5) ? 0 : 1;
	m_p[2][4] = BIT(data,4) ? 0 : 1;
	m_p[2][3] = BIT(data,3) ? 0 : 1;
	m_p[2][2] = BIT(data,2) ? 0 : 1;
	m_p[2][1] = BIT(data,1) ? 0 : 1;
	m_p[2][0] = BIT(data,0) ? 0 : 1;
}

void mmd2_state::mem_map(address_map &map)
{
	map.unmap_value_high();
	map(0x0000, 0x03ff).bankr("bank1").bankw("bank2");
	map(0x0400, 0x0fff).bankr("bank3").bankw("bank4");
	map(0xd800, 0xe3ff).bankr("bank5").bankw("bank6");
	map(0xe400, 0xe7ff).bankr("bank7").bankw("bank8");
	map(0xfc00, 0xfcff).ram(); // Scratchpad
}

void mmd2_state::io_map(address_map &map)
{
	map.unmap_value_high();
	map(0x00, 0x00).w(FUNC(mmd2_state::port00_w));
	map(0x01, 0x01).rw(FUNC(mmd2_state::port01_r), FUNC(mmd2_state::port01_w));
	map(0x02, 0x02).w(FUNC(mmd2_state::port02_w));
	map(0x03, 0x03).rw("i8279", FUNC(i8279_device::status_r), FUNC(i8279_device::cmd_w));
	map(0x04, 0x04).rw("i8279", FUNC(i8279_device::data_r), FUNC(i8279_device::data_w));
	map(0x05, 0x07).r(FUNC(mmd2_state::bank_r));
	map(0x05, 0x05).w(FUNC(mmd2_state::port05_w));
	//map(0x09, 0x09).w  PUP signal
	//map(0x0a, 0x0a).w  Eprom programmer
}


/* Input ports */
static INPUT_PORTS_START( mmd2 )
	PORT_START("DSW")
	PORT_DIPNAME( 0x20, 0x00, "Sw6") PORT_DIPLOCATION("SW1:1")
	PORT_DIPSETTING(    0x20, "Hex")
	PORT_DIPSETTING(    0x00, "Octal")
	PORT_DIPNAME( 0x10, 0x10, "Sw7") PORT_DIPLOCATION("SW1:2")
	PORT_DIPSETTING(    0x10, "PUP")
	PORT_DIPSETTING(    0x00, "Reset")
	PORT_DIPNAME( 0x08, 0x08, "Sw8") PORT_DIPLOCATION("SW1:3")
	PORT_DIPSETTING(    0x08, "Exec")
	PORT_DIPSETTING(    0x00, "User")

	PORT_START("X0")
	PORT_BIT(0x01, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("F") PORT_CODE(KEYCODE_F)
	PORT_BIT(0x02, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("E") PORT_CODE(KEYCODE_E)
	PORT_BIT(0x04, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("D") PORT_CODE(KEYCODE_D)
	PORT_BIT(0x08, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("C") PORT_CODE(KEYCODE_C)
	PORT_BIT(0x10, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("CANCEL") PORT_CODE(KEYCODE_X)
	PORT_BIT(0x20, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("AUX") PORT_CODE(KEYCODE_W)
	PORT_BIT(0x40, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("REGS") PORT_CODE(KEYCODE_R)
	PORT_BIT(0x80, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("MEM") PORT_CODE(KEYCODE_MINUS)
	PORT_START("X1")
	PORT_BIT(0x01, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("B") PORT_CODE(KEYCODE_B)
	PORT_BIT(0x02, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("A") PORT_CODE(KEYCODE_A)
	PORT_BIT(0x04, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("9") PORT_CODE(KEYCODE_9)
	PORT_BIT(0x08, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("8") PORT_CODE(KEYCODE_8)
	PORT_BIT(0x10, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("COPY") PORT_CODE(KEYCODE_Y)
	PORT_BIT(0x20, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("PROM") PORT_CODE(KEYCODE_U)
	PORT_BIT(0x40, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("DUMP") PORT_CODE(KEYCODE_I)
	PORT_BIT(0x80, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("LOAD") PORT_CODE(KEYCODE_O)
	PORT_START("X2")
	PORT_BIT(0x01, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("7") PORT_CODE(KEYCODE_7)
	PORT_BIT(0x02, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("6") PORT_CODE(KEYCODE_6)
	PORT_BIT(0x04, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("5") PORT_CODE(KEYCODE_5)
	PORT_BIT(0x08, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("4") PORT_CODE(KEYCODE_4)
	PORT_BIT(0x10, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("OPTION") PORT_CODE(KEYCODE_S)
	PORT_BIT(0x20, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("GO") PORT_CODE(KEYCODE_G)
	PORT_BIT(0x40, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("LOW") PORT_CODE(KEYCODE_L)
	PORT_BIT(0x80, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("HIGH") PORT_CODE(KEYCODE_H)
	PORT_START("X3")
	PORT_BIT(0x01, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("3") PORT_CODE(KEYCODE_3)
	PORT_BIT(0x02, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("2") PORT_CODE(KEYCODE_2)
	PORT_BIT(0x04, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("1") PORT_CODE(KEYCODE_1)
	PORT_BIT(0x08, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("0") PORT_CODE(KEYCODE_0)
	PORT_BIT(0x10, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("STEP") PORT_CODE(KEYCODE_Z)
	PORT_BIT(0x20, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("NEXT") PORT_CODE(KEYCODE_UP)
	PORT_BIT(0x40, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("STORE") PORT_CODE(KEYCODE_ENTER)
	PORT_BIT(0x80, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("PREV") PORT_CODE(KEYCODE_DOWN)
	PORT_START("RESET")
	PORT_BIT(0x01, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_NAME("RESET") PORT_CODE(KEYCODE_LALT) PORT_CHANGED_MEMBER(DEVICE_SELF, mmd2_state, reset_button, 0)
INPUT_PORTS_END

INPUT_CHANGED_MEMBER(mmd2_state::reset_button)
{
	if (newval)
		reset_banks();
	m_maincpu->set_input_line(INPUT_LINE_RESET, newval ? ASSERT_LINE : CLEAR_LINE);
}

/*
Keyboard
0  1  2  3      PREV  STORE  NEXT  STEP
4  5  6  7      HIGH  LOW  GO  OPTION
8  9  A  B      LOAD  DUMP  PROM  COPY
C  D  E  F      MEM  REGS  AUX  CANCEL

*/

READ8_MEMBER( mmd2_state::bank_r )
{
	for (auto &bank : m_banks)
		bank->set_entry(offset);
	return space.unmap();
}

READ8_MEMBER( mmd2_state::port01_r )
{
	// need to add ttyin bit 0
	uint8_t data = 0x84;
	data |= m_io_dsw->read();
	data |= (m_cass->input() < 0.02) ? 0 : 2;
	return data;
}

WRITE8_MEMBER( mmd2_state::port05_w )
{
	// need to add ttyout bit 0
	m_cass->output(BIT(data, 1) ? -1.0 : +1.0);
}

WRITE8_MEMBER( mmd2_state::scanlines_w )
{
	m_digit = data;
}

WRITE8_MEMBER( mmd2_state::digit_w )
{
	if (m_digit < 9)
		m_digits[m_digit] = data;
}

READ8_MEMBER( mmd2_state::keyboard_r )
{
	uint8_t data = 0xff;

	if (m_digit < 4)
		data = m_io_keyboard[m_digit]->read();

	return data;
}

WRITE8_MEMBER( mmd2_state::status_callback )
{
	// operate the HALT LED
	m_led_halt = ~data & i8080_cpu_device::STATUS_HLTA;
	// operate the HOLD LED - this should connect to the HLDA pin,
	// but it isn't emulated, using WO instead (whatever that does).
	m_led_hold = data & i8080_cpu_device::STATUS_WO;
}

WRITE_LINE_MEMBER( mmd2_state::inte_callback )
{
	// operate the INTE LED
	m_led_inte = state;
}

void mmd2_state::machine_start()
{
	m_digits.resolve();
	m_p.resolve();
	m_led_halt.resolve();
	m_led_hold.resolve();
	m_led_inte.resolve();
}

void mmd2_state::machine_reset()
{
	reset_banks();
}

void mmd2_state::reset_banks()
{
	for (auto &bank : m_banks)
		bank->set_entry(0);
}

void mmd2_state::init_mmd2()
{
	// We preset all banks here, so that bankswitching will incur no speed penalty.
	// 0000/0400 indicate ROMs, D800/DC00/E400 indicate RAM, 8000 is a dummy write area for ROM banks.
	uint8_t *const p_ram = memregion("maincpu")->base();
	m_banks[0]->configure_entry(0, &p_ram[0x0000]);
	m_banks[0]->configure_entry(1, &p_ram[0xd800]);
	m_banks[0]->configure_entry(2, &p_ram[0x0c00]);
	m_banks[1]->configure_entry(0, &p_ram[0x8000]);
	m_banks[1]->configure_entry(1, &p_ram[0xd800]);
	m_banks[1]->configure_entry(2, &p_ram[0x8000]);
	m_banks[2]->configure_entry(0, &p_ram[0x0400]);
	m_banks[2]->configure_entry(1, &p_ram[0xdc00]);
	m_banks[2]->configure_entry(2, &p_ram[0xdc00]);
	m_banks[3]->configure_entry(0, &p_ram[0x8000]);
	m_banks[3]->configure_entry(1, &p_ram[0xdc00]);
	m_banks[3]->configure_entry(2, &p_ram[0xdc00]);
	m_banks[4]->configure_entry(0, &p_ram[0xd800]);
	m_banks[4]->configure_entry(1, &p_ram[0x0000]);
	m_banks[4]->configure_entry(2, &p_ram[0x0000]);
	m_banks[5]->configure_entry(0, &p_ram[0xd800]);
	m_banks[5]->configure_entry(1, &p_ram[0x8000]);
	m_banks[5]->configure_entry(2, &p_ram[0x8000]);
	m_banks[6]->configure_entry(0, &p_ram[0xe400]);
	m_banks[6]->configure_entry(1, &p_ram[0x0c00]);
	m_banks[6]->configure_entry(2, &p_ram[0xd800]);
	m_banks[7]->configure_entry(0, &p_ram[0xe400]);
	m_banks[7]->configure_entry(1, &p_ram[0x8000]);
	m_banks[7]->configure_entry(2, &p_ram[0xd800]);
}

void mmd2_state::mmd2(machine_config &config)
{
	/* basic machine hardware */
	I8080(config, m_maincpu, 6750000 / 9);
	m_maincpu->set_addrmap(AS_PROGRAM, &mmd2_state::mem_map);
	m_maincpu->set_addrmap(AS_IO, &mmd2_state::io_map);
	m_maincpu->out_status_func().set(FUNC(mmd2_state::status_callback));
	m_maincpu->out_inte_func().set(FUNC(mmd2_state::inte_callback));

	/* video hardware */
	config.set_default_layout(layout_mmd2);

	/* Devices */
	i8279_device &kbdc(I8279(config, "i8279", 400000));             // based on divider
	kbdc.out_sl_callback().set(FUNC(mmd2_state::scanlines_w)); // scan SL lines
	kbdc.out_disp_callback().set(FUNC(mmd2_state::digit_w));   // display A&B
	kbdc.in_rl_callback().set(FUNC(mmd2_state::keyboard_r));        // kbd RL lines
	kbdc.in_shift_callback().set_constant(1);                       // Shift key
	kbdc.in_ctrl_callback().set_constant(1);

	// Cassette
	CASSETTE(config, m_cass);
	m_cass->set_default_state(CASSETTE_STOPPED | CASSETTE_SPEAKER_ENABLED | CASSETTE_MOTOR_ENABLED);
	SPEAKER(config, "mono").front_center();
	m_cass->add_route(ALL_OUTPUTS, "mono", 0.05);
}

/* ROM definition */
ROM_START( mmd2 )
	ROM_REGION( 0x10000, "maincpu", ROMREGION_ERASEFF )
	ROM_LOAD( "mmd2330.bin", 0x0000, 0x0800, CRC(69a77199) SHA1(6c83093b2c32a558c969f4fe8474b234023cc348))
	ROM_LOAD( "mmd2340.bin", 0x0800, 0x0800, CRC(70681bd6) SHA1(c37e3cf34a75e8538471030bb49b8aed45d00ec3))
	ROM_LOAD( "mmd2350.bin", 0x1000, 0x0800, CRC(359f577c) SHA1(9405ca0c1977721e4540a4017907c06dab08d398))
	ROM_LOAD( "mmd2360.bin", 0x1800, 0x0800, CRC(967e69b8) SHA1(c21ec8bef955806a2c6e1b1c8e9068662fb88038))
ROM_END

/* Driver */

//    YEAR  NAME   PARENT  COMPAT  MACHINE  INPUT  CLASS       INIT        COMPANY                FULLNAME  FLAGS
COMP( 1976, mmd2,  mmd1,   0,      mmd2,    mmd2,  mmd2_state, init_mmd2,  "E&L Instruments Inc", "MMD-2",  MACHINE_NO_SOUND_HW )