summaryrefslogtreecommitdiffstatshomepage
path: root/src/mame/drivers/abc80.cpp
blob: 767c537efea4ed6210e04766c735e06b4ed33887 (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
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
// license:BSD-3-Clause
// copyright-holders:Curt Coder
/*

Luxor ABC 80

PCB Layout
----------

55 10470-02

          CN1               CN2                                                CN5
  SW1   |-----|  |------------------------|                                  |-----|
|-------|     |--|                        |----------------------------------|     |---|
|                                                             CN3       CN4            |
|                                                    7912                              |
|            MC1488                                                                    |
|   MC1489                                           7812                              |
|            LS245                     LS138                                           |
|                                                   |-------|                          |
|   |-----CN6-----|   LS241   LS241    LS138  LS32  |SN76477| LS04    LM339            |
|                                                   |-------|                          |
|   |--------------|  |------------|   PROM0  LS132   LS273   7406             LS08    |
|   |   Z80A PIO   |  |    Z80A    |                                                   |
|   |--------------|  |------------|   LS04   LS74A   LS86    LS161   LS166    74393   |
|                                                                                      |
|     ROM3   LS107    4116    4116     LS10   LS257   LS74A   LS08    LS107    PROM2   |
|                                                                                      |
|     ROM2   LS257    4116    4116     LS139  74393   LS107   LS32    LS175    74393   |
|                                                                                      |
|     ROM1   LS257    4116    4116     LS08   LS283   LS10    LS32    PROM1    74393   |
|                                                                                      |
|     ROM0   LS257    4116    4116     LS257  74393   LS375   74S263  LS145    PROM4   |
|                                                                                      |
|     DIPSW1 DIPSW2   4045    4045     LS257  LS245   LS375   LS273   LS166    PROM3   |
|--------------------------------------------------------------------------------------|

Notes:
    All IC's shown.

    ROM0-3  - Texas Instruments TMS4732 4Kx8 General Purpose Mask Programmable ROM
    PROM0-2 - Philips Semiconductors N82S129 256x4 TTL Bipolar PROM
    PROM3-4 - Philips Semiconductors N82S131 512x4 TTL Bipolar PROM
    4116    - Texas Instruments TMS4116-25 16Kx1 Dynamic RAM
    4045    - Texas Instruments TMS4045-15 1Kx4 General Purpose Static RAM with Multiplexed I/O
    Z80A    - Sharp LH0080A Z80A CPU
    Z80APIO - SGS-Thomson Z8420AB1 Z80A PIO
    SN76477 - Texas Instruments SN76477N Complex Sound Generator
    74S263  - Texas Instruments SN74S263N Row Output Character Generator
    MC1488  - Texas Instruments MC1488 Quadruple Line Driver
    MC1489  - Texas Instruments MC1489 Quadruple Line Receiver
    CN1     - RS-232 connector
    CN2     - ABC bus connector (DIN 41612)
    CN3     - video connector
    CN4     - cassette motor connector
    CN5     - cassette connector
    CN6     - keyboard connector
    SW1     - reset switch
    DIPSW1  -
    DIPSW2  -

*/

/*

    TODO:

    - PWM sound in ABC-klubben/abc80/grafik/flagga.bac
    - proper keyboard controller emulation
    - MyAB TKN80 80-column card
    - GeJo 80-column card
    - Mikrodatorn 64K expansion
    - Metric ABC CAD 1000

*/

#include "emu.h"
#include "includes/abc80.h"
#include "screen.h"
#include "softlist.h"
#include "speaker.h"


//**************************************************************************
//  CONSTANTS
//**************************************************************************

#define LOG 0



//**************************************************************************
//  MEMORY MANAGEMENT
//**************************************************************************

//-------------------------------------------------
//  read -
//-------------------------------------------------

READ8_MEMBER( abc80_state::read )
{
	uint8_t data = 0xff;
	uint8_t mmu = m_mmu_rom->base()[0x40 | (offset >> 10)];

	if (!(mmu & MMU_XM))
	{
		data = m_bus->xmemfl_r(space, offset);
	}
	else if (!(mmu & MMU_ROM))
	{
		data = m_rom->base()[offset & 0x3fff];
	}
	else if (mmu & MMU_VRAMS)
	{
		data = m_video_ram[offset & 0x3ff];
	}
	else if (!(mmu & MMU_RAM))
	{
		data = m_ram->pointer()[offset & 0x3fff];
	}

	return data;
}


//-------------------------------------------------
//  write -
//-------------------------------------------------

WRITE8_MEMBER( abc80_state::write )
{
	uint8_t mmu = m_mmu_rom->base()[0x40 | (offset >> 10)];

	if (!(mmu & MMU_XM))
	{
		m_bus->xmemw_w(space, offset, data);
	}
	else if (mmu & MMU_VRAMS)
	{
		m_video_ram[offset & 0x3ff] = data;
	}
	else if (!(mmu & MMU_RAM))
	{
		m_ram->pointer()[offset & 0x3fff] = data;
	}
}



//**************************************************************************
//  SOUND
//**************************************************************************

//-------------------------------------------------
//  csg_w -
//-------------------------------------------------

WRITE8_MEMBER( abc80_state::csg_w )
{
	m_csg->enable_w(!BIT(data, 0));
	m_csg->vco_voltage_w(BIT(data, 1) ? 2.5 : 0);
	m_csg->vco_w(BIT(data, 2));
	m_csg->mixer_b_w(BIT(data, 3));
	m_csg->mixer_a_w(BIT(data, 4));
	m_csg->mixer_c_w(BIT(data, 5));
	m_csg->envelope_2_w(BIT(data, 6));
	m_csg->envelope_1_w(BIT(data, 7));
}



//**************************************************************************
//  ADDRESS MAPS
//**************************************************************************

//-------------------------------------------------
//  ADDRESS_MAP( abc80_mem )
//-------------------------------------------------

static ADDRESS_MAP_START( abc80_mem, AS_PROGRAM, 8, abc80_state )
	ADDRESS_MAP_UNMAP_HIGH
	AM_RANGE(0x0000, 0xffff) AM_READWRITE(read, write)
ADDRESS_MAP_END


//-------------------------------------------------
//  ADDRESS_MAP( abc80_io )
//-------------------------------------------------

static ADDRESS_MAP_START( abc80_io, AS_IO, 8, abc80_state )
	ADDRESS_MAP_UNMAP_HIGH
	ADDRESS_MAP_GLOBAL_MASK(0x17)
	AM_RANGE(0x00, 0x00) AM_DEVREADWRITE(ABCBUS_TAG, abcbus_slot_device, inp_r, out_w)
	AM_RANGE(0x01, 0x01) AM_DEVREADWRITE(ABCBUS_TAG, abcbus_slot_device, stat_r, cs_w)
	AM_RANGE(0x02, 0x02) AM_DEVWRITE(ABCBUS_TAG, abcbus_slot_device, c1_w)
	AM_RANGE(0x03, 0x03) AM_DEVWRITE(ABCBUS_TAG, abcbus_slot_device, c2_w)
	AM_RANGE(0x04, 0x04) AM_DEVWRITE(ABCBUS_TAG, abcbus_slot_device, c3_w)
	AM_RANGE(0x05, 0x05) AM_DEVWRITE(ABCBUS_TAG, abcbus_slot_device, c4_w)
	AM_RANGE(0x06, 0x06) AM_WRITE(csg_w)
	AM_RANGE(0x07, 0x07) AM_DEVREAD(ABCBUS_TAG, abcbus_slot_device, rst_r)
	AM_RANGE(0x10, 0x13) AM_MIRROR(0x04) AM_DEVREADWRITE(Z80PIO_TAG, z80pio_device, read_alt, write_alt)
ADDRESS_MAP_END



//**************************************************************************
//  DEVICE CONFIGURATION
//**************************************************************************

//-------------------------------------------------
//  Z80PIO
//-------------------------------------------------

READ8_MEMBER( abc80_state::pio_pa_r )
{
	/*

	    PIO Port A

	    bit     description

	    0       keyboard data
	    1       keyboard data
	    2       keyboard data
	    3       keyboard data
	    4       keyboard data
	    5       keyboard data
	    6       keyboard data
	    7       keyboard strobe

	*/

	uint8_t data = 0;

	//data |= m_kb->data_r();
	data |= m_key_data;
	data |= (m_key_strobe << 7);

	return data;
}

READ8_MEMBER( abc80_state::pio_pb_r )
{
	/*

	    PIO Channel B

	    0  R    RS-232C RxD
	    1  R    RS-232C _CTS
	    2  R    RS-232C _DCD
	    3  W    RS-232C TxD
	    4  W    RS-232C _RTS
	    5  W    Cassette Motor
	    6  W    Cassette Data
	    7  R    Cassette Data

	*/

	uint8_t data = 0;

	// receive data
	data |= m_rs232->rxd_r();

	// clear to send
	data |= m_rs232->cts_r() << 1;

	// data carrier detect
	data |= m_rs232->dcd_r() << 2;

	// cassette data
	data |= m_tape_in_latch << 7;

	if (LOG) logerror("%s %s read tape latch %u\n", machine().time().as_string(), machine().describe_context(), m_tape_in_latch);

	return data;
}

WRITE8_MEMBER( abc80_state::pio_pb_w )
{
	/*

	    PIO Channel B

	    0  R    RS-232C RxD
	    1  R    RS-232C _CTS
	    2  R    RS-232C _DCD
	    3  W    RS-232C TxD
	    4  W    RS-232C _RTS
	    5  W    Cassette Motor
	    6  W    Cassette Data
	    7  R    Cassette Data

	*/

	// transmit data
	m_rs232->write_txd(BIT(data, 3));

	// request to send
	m_rs232->write_rts(BIT(data, 4));

	// cassette motor
	if (BIT(data, 5))
	{
		if (!m_motor) if (LOG) logerror("%s %s started cassette motor\n", machine().time().as_string(), machine().describe_context());
		m_cassette->change_state(CASSETTE_MOTOR_ENABLED, CASSETTE_MASK_MOTOR);
		m_motor = true;
	}
	else
	{
		if (m_motor) if (LOG) logerror("%s %s stopped cassette motor\n", machine().time().as_string(), machine().describe_context());
		m_cassette->change_state(CASSETTE_MOTOR_DISABLED, CASSETTE_MASK_MOTOR);
		m_motor = false;
	}

	// cassette data
	m_cassette->output(BIT(data, 6) ? -1.0 : +1.0);

	// cassette input latch
	if (BIT(data, 6))
	{
		if (LOG) logerror("%s %s clear tape in latch\n", machine().time().as_string(), machine().describe_context());

		m_tape_in_latch = 1;

		m_pio->pb7_w(m_tape_in_latch);
	}
}


//-------------------------------------------------
//  Z80 Daisy Chain
//-------------------------------------------------

static const z80_daisy_config abc80_daisy_chain[] =
{
	{ Z80PIO_TAG },
	{ nullptr }
};


//-------------------------------------------------
//  ABC80_KEYBOARD_INTERFACE( kb_intf )
//-------------------------------------------------

WRITE_LINE_MEMBER( abc80_state::keydown_w )
{
	m_key_strobe = state;

	m_pio->port_a_write(m_key_strobe << 7);
}

void abc80_state::kbd_w(u8 data)
{
	m_key_data = data;
	m_key_strobe = 1;

	uint8_t pio_data = 0x80 | data;
	m_pio->port_a_write(pio_data);

	timer_set(attotime::from_msec(50), TIMER_ID_FAKE_KEYBOARD_CLEAR);
}



//**************************************************************************
//  MACHINE INITIALIZATION
//**************************************************************************

//-------------------------------------------------
//  device_timer - handler timer events
//-------------------------------------------------

void abc80_state::device_timer(emu_timer &timer, device_timer_id id, int param, void *ptr)
{
	switch (id)
	{
	case TIMER_ID_SCANLINE:
		draw_scanline(m_bitmap, m_screen->vpos());

		m_pio_astb = !m_pio_astb;

		m_pio->strobe_a(m_pio_astb);
		break;

	case TIMER_ID_CASSETTE:
		{
			if (!m_motor) return;

			int tape_in = m_cassette->input() > 0;

			if (m_tape_in != tape_in)
				if (LOG) logerror("%s tape flank %u\n", machine().time().as_string(), tape_in);

			if (m_tape_in_latch && (m_tape_in != tape_in))
			{
				if (LOG) logerror("%s set tape in latch\n", machine().time().as_string());
				m_tape_in_latch = 0;

				m_pio->port_b_write(m_tape_in_latch << 7);
			}

			m_tape_in = tape_in;
		}
		break;

	case TIMER_ID_BLINK:
		m_blink = !m_blink;
		break;

	case TIMER_ID_VSYNC_ON:
		if (LOG) logerror("%s vsync 1\n", machine().time().as_string());
		m_maincpu->set_input_line(INPUT_LINE_NMI, ASSERT_LINE);
		break;

	case TIMER_ID_VSYNC_OFF:
		if (LOG) logerror("%s vsync 0\n", machine().time().as_string());
		m_maincpu->set_input_line(INPUT_LINE_NMI, CLEAR_LINE);
		break;

	case TIMER_ID_FAKE_KEYBOARD_CLEAR:
		m_pio->port_a_write(m_key_data);
		m_key_strobe = 0;
		m_key_data = 0;
		break;
	}
}


//-------------------------------------------------
//  MACHINE_START( abc80 )
//-------------------------------------------------

void abc80_state::machine_start()
{
	// start timers
	m_cassette_timer = timer_alloc(TIMER_ID_CASSETTE);
	m_cassette_timer->adjust(attotime::from_hz(44100), 0, attotime::from_hz(44100));

	// register for state saving
	save_item(NAME(m_key_data));
	save_item(NAME(m_key_strobe));
	save_item(NAME(m_pio_astb));
	save_item(NAME(m_latch));
	save_item(NAME(m_blink));
	save_item(NAME(m_motor));
	save_item(NAME(m_tape_in));
	save_item(NAME(m_tape_in_latch));
}

QUICKLOAD_LOAD_MEMBER( abc80_state, bac )
{
	address_space &space = m_maincpu->space(AS_PROGRAM);

	offs_t address = space.read_byte(BOFA + 1) << 8 | space.read_byte(BOFA);
	if (LOG) logerror("BOFA %04x\n",address);

	std::vector<uint8_t> data;
	data.resize(quickload_size);
	image.fread(&data[0], quickload_size);
	for (int i = 1; i < quickload_size; i++)
		space.write_byte(address++, data[i]);

	offs_t eofa = address;
	space.write_byte(EOFA, eofa & 0xff);
	space.write_byte(EOFA + 1, eofa >> 8);
	if (LOG) logerror("EOFA %04x\n",address);

	offs_t head = address + 1;
	space.write_byte(HEAD, head & 0xff);
	space.write_byte(HEAD + 1, head >> 8);
	if (LOG) logerror("HEAD %04x\n",address);

	return image_init_result::PASS;
}



//**************************************************************************
//  MACHINE DRIVERS
//**************************************************************************

//-------------------------------------------------
//  MACHINE_CONFIG( abc80 )
//-------------------------------------------------

MACHINE_CONFIG_START(abc80_state::abc80)
	// basic machine hardware
	MCFG_CPU_ADD(Z80_TAG, Z80, XTAL_11_9808MHz/2/2) // 2.9952 MHz
	MCFG_CPU_PROGRAM_MAP(abc80_mem)
	MCFG_CPU_IO_MAP(abc80_io)
	MCFG_Z80_DAISY_CHAIN(abc80_daisy_chain)

	// video hardware
	MCFG_FRAGMENT_ADD(abc80_video)

	// sound hardware
	MCFG_SPEAKER_STANDARD_MONO("mono")
	MCFG_SOUND_ADD(SN76477_TAG, SN76477, 0)
	MCFG_SN76477_NOISE_PARAMS(RES_K(47), RES_K(330), CAP_P(390)) // noise + filter: R26 47k - R24 330k - C52 390p
	MCFG_SN76477_DECAY_RES(RES_K(47))                   //  decay_res: R23 47k
	MCFG_SN76477_ATTACK_PARAMS(CAP_U(10), RES_K(2.2))   // attack_decay_cap + attack_res: C50 10u/35V - R21 2.2k
	MCFG_SN76477_AMP_RES(RES_K(33))                     // amplitude_res: R19 33k
	MCFG_SN76477_FEEDBACK_RES(RES_K(10))                // feedback_res: R18 10k
	MCFG_SN76477_VCO_PARAMS(0, CAP_N(10), RES_K(100))   // VCO volt + cap + res: 0V/2.5V (voltage divider R17 1k / R16 1k) - C48 10n - R20 100k
	MCFG_SN76477_PITCH_VOLTAGE(0)                       // pitch_voltage: N/C
	MCFG_SN76477_SLF_PARAMS(CAP_U(1), RES_K(220))       // slf caps + res: C51 1u/35V - R22 220k
	MCFG_SN76477_ONESHOT_PARAMS(CAP_U(0.1), RES_K(330)) // oneshot caps + res: C53 0.1u - R25 330k
	MCFG_SOUND_ROUTE(ALL_OUTPUTS, "mono", 0.25)

	MCFG_SOUND_WAVE_ADD(WAVE_TAG, CASSETTE_TAG)
	MCFG_SOUND_ROUTE(ALL_OUTPUTS, "mono", 0.25)

	// devices
	MCFG_DEVICE_ADD(Z80PIO_TAG, Z80PIO, XTAL_11_9808MHz/2/2)
	MCFG_Z80PIO_OUT_INT_CB(INPUTLINE(Z80_TAG, INPUT_LINE_IRQ0))
	MCFG_Z80PIO_IN_PA_CB(READ8(abc80_state, pio_pa_r))
	MCFG_Z80PIO_IN_PB_CB(READ8(abc80_state, pio_pb_r))
	MCFG_Z80PIO_OUT_PB_CB(WRITE8(abc80_state, pio_pb_w))

	MCFG_CASSETTE_ADD(CASSETTE_TAG)
	MCFG_CASSETTE_DEFAULT_STATE(CASSETTE_STOPPED | CASSETTE_MOTOR_DISABLED | CASSETTE_SPEAKER_ENABLED)
	MCFG_CASSETTE_INTERFACE("abc80_cass")

	MCFG_DEVICE_ADD(ABC80_KEYBOARD_TAG, ABC80_KEYBOARD, 0)
	MCFG_ABC80_KEYBOARD_KEYDOWN_CALLBACK(WRITELINE(abc80_state, keydown_w))

	MCFG_ABCBUS_SLOT_ADD(ABCBUS_TAG, abc80_cards, "abcexp")

	MCFG_RS232_PORT_ADD(RS232_TAG, default_rs232_devices, nullptr)
	MCFG_DEVICE_ADD(KEYBOARD_TAG, GENERIC_KEYBOARD, 0)
	MCFG_GENERIC_KEYBOARD_CB(PUT(abc80_state, kbd_w))

	MCFG_QUICKLOAD_ADD("quickload", abc80_state, bac, "bac", 2)

	// internal ram
	MCFG_RAM_ADD(RAM_TAG)
	MCFG_RAM_DEFAULT_SIZE("16K")

	// software list
	MCFG_SOFTWARE_LIST_ADD("cass_list", "abc80_cass")
	MCFG_SOFTWARE_LIST_ADD("flop_list", "abc80_flop")
MACHINE_CONFIG_END



//**************************************************************************
//  ROMS
//**************************************************************************

//-------------------------------------------------
//  ROM( abc80 )
//-------------------------------------------------

ROM_START( abc80 )
	ROM_REGION( 0x4000, Z80_TAG, 0 )
	ROM_DEFAULT_BIOS("v2")
	ROM_SYSTEM_BIOS( 0, "v1", "V1" )
	ROMX_LOAD( "3506_3.a5", 0x0000, 0x1000, CRC(7c004fb6) SHA1(9aee1d085122f4537c3e6ecdab9d799bd429ef52), ROM_BIOS(1) )
	ROMX_LOAD( "3507_3.a3", 0x1000, 0x1000, CRC(d1850a84) SHA1(f7719f3af9173601a2aa23ae38ae00de1a387ad8), ROM_BIOS(1) )
	ROMX_LOAD( "3508_3.a4", 0x2000, 0x1000, CRC(b55528e9) SHA1(3e5017e8cacad1f13215242f1bbd89d1d3eee131), ROM_BIOS(1) )
	ROMX_LOAD( "3509_3.a2", 0x3000, 0x1000, CRC(659cab1e) SHA1(181db748cef22cdcccd311a60aa6189c85343db7), ROM_BIOS(1) )
	ROM_SYSTEM_BIOS( 1, "v2", "V2" )
	ROMX_LOAD( "3506_3_v2.a5", 0x0000, 0x1000, CRC(e2afbf48) SHA1(9883396edd334835a844dcaa792d29599a8c67b9), ROM_BIOS(2) )
	ROMX_LOAD( "3507_3_v2.a3", 0x1000, 0x1000, CRC(d224412a) SHA1(30968054bba7c2aecb4d54864b75a446c1b8fdb1), ROM_BIOS(2) )
	ROMX_LOAD( "3508_3_v2.a4", 0x2000, 0x1000, CRC(1502ba5b) SHA1(5df45909c2c4296e5701c6c99dfaa9b10b3a729b), ROM_BIOS(2) )
	ROMX_LOAD( "3509_3_v2.a2", 0x3000, 0x1000, CRC(bc8860b7) SHA1(28b6cf7f5a4f81e017c2af091c3719657f981710), ROM_BIOS(2) )

	ROM_REGION( 0xa00, "chargen", 0 )
	ROM_LOAD( "sn74s263.h2", 0x0000, 0x0a00, BAD_DUMP CRC(9e064e91) SHA1(354783c8f2865f73dc55918c9810c66f3aca751f) ) // created by hand

	ROM_REGION( 0x100, "hsync", 0 )
	ROM_LOAD( "abc80_11.k5", 0x0000, 0x0100, CRC(e4f7e018) SHA1(63e718a39537f37286ea183e6469808c271dbfa5) ) // "64 40029-01" 82S129 256x4 horizontal sync

	ROM_REGION( 0x200, "vsync", 0 )
	ROM_LOAD( "abc80_21.k2", 0x0000, 0x0200, CRC(445a45b9) SHA1(bcc1c4fafe68b3500b03de785ca32abd63cea252) ) // "64 40030-01" 82S131 512x4 vertical sync

	ROM_REGION( 0x100, "attr", 0 )
	ROM_LOAD( "abc80_12.j3", 0x0000, 0x0100, CRC(6c46811c) SHA1(2d3bdf2d3a2a88ddb1c0c637967e1b2b9541a928) ) // "64 40056-01" 82S129 256x4 attribute

	ROM_REGION( 0x200, "line", 0 )
	ROM_LOAD( "abc80_22.k1", 0x0000, 0x0200, CRC(74de7a0b) SHA1(96f37b0ca65aa8af4242bad38124f410b7f657fe) ) // "64 40058-01" 82S131 512x4 chargen 74S263 row address

	ROM_REGION( 0x100, "mmu", 0 )
	ROM_LOAD( "abc80_13.e7", 0x0000, 0x0100, CRC(f7738834) SHA1(b02df3e678fb50c9cb75b4a97615222d3b4577a3) ) // "64 40057-01" 82S129 256x4 address decoder
ROM_END



//**************************************************************************
//  SYSTEM DRIVERS
//**************************************************************************

//    YEAR  NAME    PARENT  COMPAT  MACHINE INPUT  STATE         INIT    COMPANY              FULLNAME    FLAGS
COMP( 1978, abc80,  0,      0,      abc80,  0,     abc80_state,  0,      "Luxor Datorer AB",  "ABC 80",   MACHINE_SUPPORTS_SAVE | MACHINE_IMPERFECT_SOUND )