summaryrefslogtreecommitdiffstatshomepage
path: root/src/devices/bus/ieee488/c8280.cpp
blob: 29ade86c570c95bf00badfdc73764a44a3b2b1c1 (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
// license:BSD-3-Clause
// copyright-holders:Curt Coder
/**********************************************************************

    Commodore 8280 Dual 8" Disk Drive emulation

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

#include "c8280.h"



//**************************************************************************
//  MACROS / CONSTANTS
//**************************************************************************

#define M6502_DOS_TAG   "5c"
#define M6502_FDC_TAG   "9e"
#define M6532_0_TAG     "9f"
#define M6532_1_TAG     "9g"
#define WD1797_TAG      "5e"


enum
{
	LED_POWER = 0,
	LED_ACT0,
	LED_ACT1,
	LED_ERR
};



//**************************************************************************
//  DEVICE DEFINITIONS
//**************************************************************************

const device_type C8280 = &device_creator<c8280_t>;


//-------------------------------------------------
//  ROM( c8280 )
//-------------------------------------------------

ROM_START( c8280 )
	ROM_REGION( 0x4000, M6502_DOS_TAG, 0 )
	ROM_DEFAULT_BIOS("r2")
	ROM_SYSTEM_BIOS( 0, "r1", "Revision 1" )
	ROMX_LOAD( "300542-001.10c", 0x0000, 0x2000, CRC(3c6eee1e) SHA1(0726f6ab4de4fc9c18707fe87780ffd9f5ed72ab), ROM_BIOS(1) )
	ROMX_LOAD( "300543-001.10d", 0x2000, 0x2000, CRC(f58e665e) SHA1(9e58b47c686c91efc6ef1a27f72dbb5e26c485ec), ROM_BIOS(1) )
	ROM_SYSTEM_BIOS( 1, "r2", "Revision 2" )
	ROMX_LOAD( "300542-reva.10c", 0x0000, 0x2000, CRC(6f32ccfb) SHA1(6926c049f1635e6769ec69891de8c92941ff880e), ROM_BIOS(2) )
	ROMX_LOAD( "300543-reva.10d", 0x2000, 0x2000, CRC(1af93f2c) SHA1(ad197b1d5dfa273487b33f473403ebd20dd15b2b), ROM_BIOS(2) )

	ROM_REGION( 0x800, M6502_FDC_TAG, 0 )
	ROMX_LOAD( "300541-001.3c", 0x000, 0x800, BAD_DUMP CRC(cb07b2db) SHA1(a1f9c5a7bd3798f5a97dc0b465c3bf5e3513e148), ROM_BIOS(1) )
	ROMX_LOAD( "300541-revb.3c", 0x000, 0x800, CRC(403e632c) SHA1(a0994c80025240d2b49ffd209dbfe8a4de3975b0), ROM_BIOS(2) )
ROM_END


//-------------------------------------------------
//  rom_region - device-specific ROM region
//-------------------------------------------------

const rom_entry *c8280_t::device_rom_region() const
{
	return ROM_NAME( c8280 );
}


//-------------------------------------------------
//  ADDRESS_MAP( c8280_main_mem )
//-------------------------------------------------

static ADDRESS_MAP_START( c8280_main_mem, AS_PROGRAM, 8, c8280_t )
	AM_RANGE(0x0000, 0x007f) AM_MIRROR(0x100) AM_DEVICE(M6532_0_TAG, mos6532_t, ram_map)
	AM_RANGE(0x0080, 0x00ff) AM_MIRROR(0x100) AM_DEVICE(M6532_1_TAG, mos6532_t, ram_map)
	AM_RANGE(0x0200, 0x021f) AM_MIRROR(0xd60) AM_DEVICE(M6532_0_TAG, mos6532_t, io_map)
	AM_RANGE(0x0280, 0x029f) AM_MIRROR(0xd60) AM_DEVICE(M6532_1_TAG, mos6532_t, io_map)
	AM_RANGE(0x1000, 0x13ff) AM_MIRROR(0xc00) AM_RAM AM_SHARE("share1")
	AM_RANGE(0x2000, 0x23ff) AM_MIRROR(0xc00) AM_RAM AM_SHARE("share2")
	AM_RANGE(0x3000, 0x33ff) AM_MIRROR(0xc00) AM_RAM AM_SHARE("share3")
	AM_RANGE(0x4000, 0x43ff) AM_MIRROR(0xc00) AM_RAM AM_SHARE("share4")
	AM_RANGE(0xc000, 0xffff) AM_ROM AM_REGION(M6502_DOS_TAG, 0)
ADDRESS_MAP_END


//-------------------------------------------------
//  ADDRESS_MAP( c8280_fdc_mem )
//-------------------------------------------------

static ADDRESS_MAP_START( c8280_fdc_mem, AS_PROGRAM, 8, c8280_t )
	ADDRESS_MAP_GLOBAL_MASK(0x1fff)
	AM_RANGE(0x0000, 0x007f) AM_MIRROR(0x300) AM_RAM
	AM_RANGE(0x0080, 0x0083) AM_MIRROR(0x37c) AM_DEVREADWRITE(WD1797_TAG, fd1797_t, read, write)
	AM_RANGE(0x0400, 0x07ff) AM_RAM AM_SHARE("share1")
	AM_RANGE(0x0800, 0x0bff) AM_RAM AM_SHARE("share2")
	AM_RANGE(0x0c00, 0x0fff) AM_RAM AM_SHARE("share3")
	AM_RANGE(0x1000, 0x13ff) AM_RAM AM_SHARE("share4")
	AM_RANGE(0x1400, 0x1400) AM_MIRROR(0x3ff) AM_READWRITE(fk5_r, fk5_w)
	AM_RANGE(0x1800, 0x1fff) AM_ROM AM_REGION(M6502_FDC_TAG, 0)
ADDRESS_MAP_END


//-------------------------------------------------
//  riot6532 0
//-------------------------------------------------

READ8_MEMBER( c8280_t::dio_r )
{
	/*

	    bit     description

	    PA0     DI0
	    PA1     DI1
	    PA2     DI2
	    PA3     DI3
	    PA4     DI4
	    PA5     DI5
	    PA6     DI6
	    PA7     DI7

	*/

	return m_bus->dio_r();
}

WRITE8_MEMBER( c8280_t::dio_w )
{
	/*

	    bit     description

	    PB0     DO0
	    PB1     DO1
	    PB2     DO2
	    PB3     DO3
	    PB4     DO4
	    PB5     DO5
	    PB6     DO6
	    PB7     DO7

	*/

	m_bus->dio_w(this, data);
}


//-------------------------------------------------
//  riot6532 1
//-------------------------------------------------

READ8_MEMBER( c8280_t::riot1_pa_r )
{
	/*

	    bit     description

	    PA0
	    PA1
	    PA2
	    PA3
	    PA4
	    PA5     EOII
	    PA6     DAVI
	    PA7     _ATN

	*/

	UINT8 data = 0;

	// end or identify in
	data |= m_bus->eoi_r() << 5;

	// data valid in
	data |= m_bus->dav_r() << 6;

	// attention
	data |= !m_bus->atn_r() << 7;

	return data;
}

WRITE8_MEMBER( c8280_t::riot1_pa_w )
{
	/*

	    bit     description

	    PA0     ATNA
	    PA1     DACO
	    PA2     RFDO
	    PA3     EOIO
	    PA4     DAVO
	    PA5
	    PA6
	    PA7

	*/

	// attention acknowledge
	m_atna = BIT(data, 0);

	// data accepted out
	m_daco = BIT(data, 1);

	// not ready for data out
	m_rfdo = BIT(data, 2);

	// end or identify out
	m_bus->eoi_w(this, BIT(data, 3));

	// data valid out
	m_bus->dav_w(this, BIT(data, 4));

	update_ieee_signals();
}

READ8_MEMBER( c8280_t::riot1_pb_r )
{
	/*

	    bit     description

	    PB0     DEVICE NUMBER SELECTION
	    PB1     DEVICE NUMBER SELECTION
	    PB2     DEVICE NUMBER SELECTION
	    PB3
	    PB4
	    PB5
	    PB6     DACI
	    PB7     RFDI

	*/

	UINT8 data = 0;

	// device number selection
	data |= m_slot->get_address() - 8;

	// data accepted in
	data |= m_bus->ndac_r() << 6;

	// ready for data in
	data |= m_bus->nrfd_r() << 7;

	return data;
}

WRITE8_MEMBER( c8280_t::riot1_pb_w )
{
	/*

	    bit     description

	    PB0
	    PB1
	    PB2
	    PB3     ACT LED 1
	    PB4     ACT LED 0
	    PB5     ERR LED
	    PB6
	    PB7

	*/

	// activity led 1
	output_set_led_value(LED_ACT1, BIT(data, 3));

	// activity led 0
	output_set_led_value(LED_ACT0, BIT(data, 4));

	// error led
	output_set_led_value(LED_ERR, BIT(data, 5));
}

static SLOT_INTERFACE_START( c8280_floppies )
	SLOT_INTERFACE( "8dsdd", FLOPPY_8_DSDD )
SLOT_INTERFACE_END

FLOPPY_FORMATS_MEMBER( c8280_t::floppy_formats )
	FLOPPY_C8280_FORMAT
FLOPPY_FORMATS_END


//-------------------------------------------------
//  MACHINE_CONFIG_FRAGMENT( c8280 )
//-------------------------------------------------

static MACHINE_CONFIG_FRAGMENT( c8280 )
	MCFG_CPU_ADD(M6502_DOS_TAG, M6502, XTAL_12MHz/8)
	MCFG_CPU_PROGRAM_MAP(c8280_main_mem)

	MCFG_DEVICE_ADD(M6532_0_TAG, MOS6532n, XTAL_12MHz/8)
	MCFG_MOS6530n_IN_PA_CB(READ8(c8280_t, dio_r))
	MCFG_MOS6530n_OUT_PB_CB(WRITE8(c8280_t, dio_w))

	MCFG_DEVICE_ADD(M6532_1_TAG, MOS6532n, XTAL_12MHz/8)
	MCFG_MOS6530n_IN_PA_CB(READ8(c8280_t, riot1_pa_r))
	MCFG_MOS6530n_OUT_PA_CB(WRITE8(c8280_t, riot1_pa_w))
	MCFG_MOS6530n_IN_PB_CB(READ8(c8280_t, riot1_pb_r))
	MCFG_MOS6530n_OUT_PB_CB(WRITE8(c8280_t, riot1_pb_w))
	MCFG_MOS6530n_IRQ_CB(INPUTLINE(M6502_DOS_TAG, INPUT_LINE_IRQ0))

	MCFG_CPU_ADD(M6502_FDC_TAG, M6502, XTAL_12MHz/8)
	MCFG_CPU_PROGRAM_MAP(c8280_fdc_mem)

	MCFG_FD1797_ADD(WD1797_TAG, XTAL_12MHz/6)
	MCFG_WD_FDC_INTRQ_CALLBACK(INPUTLINE(M6502_FDC_TAG, M6502_IRQ_LINE))
	MCFG_WD_FDC_DRQ_CALLBACK(INPUTLINE(M6502_FDC_TAG, M6502_SET_OVERFLOW))
	MCFG_FLOPPY_DRIVE_ADD(WD1797_TAG ":0", c8280_floppies, "8dsdd", c8280_t::floppy_formats)
	MCFG_FLOPPY_DRIVE_ADD(WD1797_TAG ":1", c8280_floppies, "8dsdd", c8280_t::floppy_formats)
MACHINE_CONFIG_END


//-------------------------------------------------
//  machine_config_additions - device-specific
//  machine configurations
//-------------------------------------------------

machine_config_constructor c8280_t::device_mconfig_additions() const
{
	return MACHINE_CONFIG_NAME( c8280 );
}


//-------------------------------------------------
//  INPUT_PORTS( c8280 )
//-------------------------------------------------

static INPUT_PORTS_START( c8280 )
	PORT_START("ADDRESS")
	PORT_DIPNAME( 0x07, 0x00, "Device Address" )
	PORT_DIPSETTING(    0x00, "8" )
	PORT_DIPSETTING(    0x01, "9" )
	PORT_DIPSETTING(    0x02, "10" )
	PORT_DIPSETTING(    0x03, "11" )
	PORT_DIPSETTING(    0x04, "12" )
	PORT_DIPSETTING(    0x05, "13" )
	PORT_DIPSETTING(    0x06, "14" )
	PORT_DIPSETTING(    0x07, "15" )
INPUT_PORTS_END


//-------------------------------------------------
//  input_ports - device-specific input ports
//-------------------------------------------------

ioport_constructor c8280_t::device_input_ports() const
{
	return INPUT_PORTS_NAME( c8280 );
}



//**************************************************************************
//  INLINE HELPERS
//**************************************************************************

//-------------------------------------------------
//  update_ieee_signals -
//-------------------------------------------------

inline void c8280_t::update_ieee_signals()
{
	int atn = m_bus->atn_r();
	int nrfd = !(!(!(atn && m_atna) && m_rfdo) || !(atn || m_atna));
	int ndac = !(m_daco || !(atn || m_atna));

	m_bus->nrfd_w(this, nrfd);
	m_bus->ndac_w(this, ndac);
}



//**************************************************************************
//  LIVE DEVICE
//**************************************************************************

//-------------------------------------------------
//  c8280_t - constructor
//-------------------------------------------------

c8280_t::c8280_t(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock) :
	device_t(mconfig, C8280, "C8280", tag, owner, clock, "c8280", __FILE__),
	device_ieee488_interface(mconfig, *this),
	m_maincpu(*this, M6502_DOS_TAG),
	m_fdccpu(*this, M6502_FDC_TAG),
	m_riot0(*this, M6532_0_TAG),
	m_riot1(*this, M6532_1_TAG),
	m_fdc(*this, WD1797_TAG),
	m_floppy0(*this, WD1797_TAG ":0"),
	m_floppy1(*this, WD1797_TAG ":1"),
	m_address(*this, "ADDRESS"), m_floppy(nullptr),
	m_rfdo(1),
	m_daco(1),
	m_atna(1), m_ifc(0), m_fk5(0)
{
}


//-------------------------------------------------
//  device_start - device-specific startup
//-------------------------------------------------

void c8280_t::device_start()
{
	// state saving
	save_item(NAME(m_rfdo));
	save_item(NAME(m_daco));
	save_item(NAME(m_atna));
	save_item(NAME(m_ifc));
	save_item(NAME(m_fk5));
}


//-------------------------------------------------
//  device_reset - device-specific reset
//-------------------------------------------------

void c8280_t::device_reset()
{
	m_maincpu->reset();

	// toggle M6502 SO
	m_maincpu->set_input_line(M6502_SET_OVERFLOW, ASSERT_LINE);
	m_maincpu->set_input_line(M6502_SET_OVERFLOW, CLEAR_LINE);

	m_fdccpu->reset();

	m_riot0->reset();
	m_riot1->reset();
	m_fdc->reset();

	m_riot1->pa7_w(1);

	m_fk5 = 0;
	m_floppy = nullptr;
	m_fdc->set_floppy(m_floppy);
	m_fdc->dden_w(0);
}


//-------------------------------------------------
//  ieee488_atn -
//-------------------------------------------------

void c8280_t::ieee488_atn(int state)
{
	update_ieee_signals();

	m_riot1->pa7_w(state);
}


//-------------------------------------------------
//  ieee488_ifc -
//-------------------------------------------------

void c8280_t::ieee488_ifc(int state)
{
	if (!m_ifc && state)
	{
		device_reset();
	}

	m_ifc = state;
}

READ8_MEMBER( c8280_t::fk5_r )
{
	/*

	    bit     description

	    0
	    1
	    2
	    3       DCHG
	    4       TSID
	    5
	    6       0
	    7       0

	*/

	UINT8 data = m_fk5;

	data |= (m_floppy ? m_floppy->dskchg_r() : 1) << 3;
	data |= (m_floppy ? m_floppy->twosid_r() : 1) << 4;

	return data;
}

WRITE8_MEMBER( c8280_t::fk5_w )
{
	/*

	    bit     description

	    0       DS1
	    1       DS2
	    2       _DDEN
	    3
	    4
	    5       MOTOR ENABLE
	    6
	    7

	*/

	m_fk5 = data & 0x27;

	// drive select
	m_floppy = nullptr;

	if (BIT(data, 0)) m_floppy = m_floppy0->get_device();
	if (BIT(data, 1)) m_floppy = m_floppy1->get_device();

	m_fdc->set_floppy(m_floppy);

	if (m_floppy) m_floppy->mon_w(!BIT(data, 5));

	// density select
	m_fdc->dden_w(BIT(data, 2));
}