summaryrefslogtreecommitdiffstatshomepage
path: root/src/mame/drivers/unixpc.cpp
blob: c28fc92cc3d2c5319e98a1b6f75b701c8314f673 (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
// license:GPL-2.0+
// copyright-holders:Dirk Best, R. Belmont
/***************************************************************************

    AT&T UNIX PC series (7300 and 3B1)

    Skeleton driver by Dirk Best and R. Belmont

    DIVS instruction at 0x801112 (the second time) causes a divide-by-zero
    exception the system isn't ready for due to word at 0x5EA6 being zero.

    Code might not get there if the attempted FDC boot succeeds; FDC hookup
    probably needs help.  2797 isn't asserting DRQ?

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


#include "emu.h"
#include "cpu/m68000/m68000.h"
#include "bus/centronics/ctronics.h"
#include "bus/rs232/rs232.h"
#include "imagedev/floppy.h"
#include "imagedev/harddriv.h"
#include "machine/6850acia.h"
#include "machine/74259.h"
#include "machine/bankdev.h"
#include "machine/input_merger.h"
#include "machine/output_latch.h"
#include "machine/ram.h"
//#include "machine/tc8250.h"
#include "machine/wd1010.h"
#include "machine/wd_fdc.h"
#include "machine/z80sio.h"
#include "emupal.h"
#include "screen.h"

#include "unixpc.lh"


/***************************************************************************
    DRIVER STATE
***************************************************************************/

class unixpc_state : public driver_device
{
public:
	unixpc_state(const machine_config &mconfig, device_type type, const char *tag) :
		driver_device(mconfig, type, tag),
		m_maincpu(*this, "maincpu"),
		m_gcr(*this, "gcr"),
		m_tcr(*this, "tcr"),
		m_int02(*this, "int02"),
		m_ram(*this, RAM_TAG),
		m_wd2797(*this, "wd2797"),
		m_floppy(*this, "wd2797:0:525dd"),
		m_hdc(*this, "hdc"),
		m_hdr0(*this, "hdc:0"),
		m_ramrombank(*this, "ramrombank"),
		m_mapram(*this, "mapram"),
		m_videoram(*this, "videoram")
	{ }

	void unixpc(machine_config &config);

private:
	uint32_t screen_update(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect);

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

	uint16_t line_printer_r();
	void disk_control_w(uint8_t data);
	void gcr_w(offs_t offset, uint16_t data);
	DECLARE_WRITE_LINE_MEMBER(romlmap_w);
	DECLARE_WRITE_LINE_MEMBER(error_enable_w);
	DECLARE_WRITE_LINE_MEMBER(parity_enable_w);
	DECLARE_WRITE_LINE_MEMBER(bpplus_w);
	uint16_t ram_mmu_r(offs_t offset);
	void ram_mmu_w(offs_t offset, uint16_t data, uint16_t mem_mask = ~0);
	uint16_t gsr_r();
	void tcr_w(offs_t offset, uint16_t data);
	uint16_t tsr_r();
	uint16_t rtc_r();
	void rtc_w(uint16_t data);
	uint16_t diskdma_size_r();
	void diskdma_size_w(offs_t offset, uint16_t data, uint16_t mem_mask = ~0);
	void diskdma_ptr_w(offs_t offset, uint16_t data);

	DECLARE_WRITE_LINE_MEMBER(wd2797_intrq_w);
	DECLARE_WRITE_LINE_MEMBER(wd2797_drq_w);

	DECLARE_WRITE_LINE_MEMBER(wd1010_intrq_w);

	void ramrombank_map(address_map &map);
	void unixpc_mem(address_map &map);

private:
	required_device<cpu_device> m_maincpu;
	required_device<ls259_device> m_gcr;
	required_device<ls259_device> m_tcr;
	required_device<input_merger_device> m_int02;
	required_device<ram_device> m_ram;
	required_device<wd2797_device> m_wd2797;
	required_device<floppy_image_device> m_floppy;
	required_device<wd1010_device> m_hdc;
	required_device<harddisk_image_device> m_hdr0;
	required_device<address_map_bank_device> m_ramrombank;

	required_shared_ptr<uint16_t> m_mapram;
	required_shared_ptr<uint16_t> m_videoram;

	uint16_t *m_ramptr;
	uint32_t m_ramsize;
	uint16_t m_diskdmasize;
	uint32_t m_diskdmaptr;
	bool m_fdc_intrq;
	bool m_hdc_intrq;
};


/***************************************************************************
    MEMORY
***************************************************************************/

void unixpc_state::gcr_w(offs_t offset, uint16_t data)
{
	m_gcr->write_bit(offset >> 11, BIT(data, 15));
}

WRITE_LINE_MEMBER(unixpc_state::romlmap_w)
{
	m_ramrombank->set_bank(state ? 1 : 0);
}

uint16_t unixpc_state::ram_mmu_r(offs_t offset)
{
	// TODO: MMU translation
	if (offset > m_ramsize)
	{
		return 0xffff;
	}
	return m_ramptr[offset];
}

void unixpc_state::ram_mmu_w(offs_t offset, uint16_t data, uint16_t mem_mask)
{
	// TODO: MMU translation
	if (offset < m_ramsize)
	{
		COMBINE_DATA(&m_ramptr[offset]);
	}
}

void unixpc_state::machine_start()
{
	m_ramptr = (uint16_t *)m_ram->pointer();
	m_ramsize = m_ram->size();
}

void unixpc_state::machine_reset()
{
	disk_control_w(0);
}

WRITE_LINE_MEMBER(unixpc_state::error_enable_w)
{
	logerror("error_enable_w: %d\n", state);
}

WRITE_LINE_MEMBER(unixpc_state::parity_enable_w)
{
	logerror("parity_enable_w: %d\n", state);
}

WRITE_LINE_MEMBER(unixpc_state::bpplus_w)
{
	logerror("bpplus_w: %d\n", state);
}

/***************************************************************************
    MISC
***************************************************************************/

uint16_t unixpc_state::gsr_r()
{
	return 0;
}

void unixpc_state::tcr_w(offs_t offset, uint16_t data)
{
	m_tcr->write_bit(offset >> 11, BIT(data, 14));
}

uint16_t unixpc_state::tsr_r()
{
	return 0;
}

uint16_t unixpc_state::rtc_r()
{
	return 0;
}

void unixpc_state::rtc_w(uint16_t data)
{
	logerror("rtc_w: %04x\n", data);
}

uint16_t unixpc_state::line_printer_r()
{
	uint16_t data = 0;

	data |= 1; // no dial tone detected
	data |= 1 << 1; // no parity error
	data |= m_hdc_intrq ? 1<<2 : 0<<2;
	data |= m_fdc_intrq ? 1<<3 : 0<<3;

	//logerror("line_printer_r: %04x\n", data);

	return data;
}

/***************************************************************************
    DMA
***************************************************************************/

uint16_t unixpc_state::diskdma_size_r()
{
	return m_diskdmasize;
}

void unixpc_state::diskdma_size_w(offs_t offset, uint16_t data, uint16_t mem_mask)
{
	COMBINE_DATA( &m_diskdmasize );
	logerror("%x to disk DMA size\n", data);
}

void unixpc_state::diskdma_ptr_w(offs_t offset, uint16_t data)
{
	if (offset >= 0x2000)
	{
		// set top 4 bytes
		m_diskdmaptr &= 0xff;
		m_diskdmaptr |= (offset << 8);
	}
	else
	{
		m_diskdmaptr &= 0xffff00;
		m_diskdmaptr |= (offset & 0xff);
	}

	logerror("diskdma_ptr_w: wrote at %x, ptr now %x\n", offset<<1, m_diskdmaptr);
}

/***************************************************************************
    FLOPPY
***************************************************************************/

void unixpc_state::disk_control_w(uint8_t data)
{
	logerror("disk_control_w: %02x\n", data);

	// TODO: bits 0-2 = head select

	m_hdc->drdy_w(BIT(data, 3) && m_hdr0->exists());

	if (!BIT(data, 4))
		m_hdc->reset();

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

	// bit 6 = floppy selected / not selected
	if (BIT(data, 6))
		m_wd2797->set_floppy(m_floppy);
	else
		m_wd2797->set_floppy(nullptr);

	m_wd2797->mr_w(BIT(data, 7));
}

WRITE_LINE_MEMBER(unixpc_state::wd2797_intrq_w)
{
	logerror("wd2797_intrq_w: %d\n", state);
	m_fdc_intrq = state;
	m_int02->in_w<1>(state);
}

WRITE_LINE_MEMBER(unixpc_state::wd2797_drq_w)
{
	logerror("wd2797_drq_w: %d\n", state);
}

/***************************************************************************
    HARD DISK
***************************************************************************/

WRITE_LINE_MEMBER(unixpc_state::wd1010_intrq_w)
{
	m_hdc_intrq = state;
	m_int02->in_w<0>(state);
}

/***************************************************************************
    VIDEO
***************************************************************************/

uint32_t unixpc_state::screen_update(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect)
{
	for (int y = 0; y < 348; y++)
		for (int x = 0; x < 720/16; x++)
			for (int b = 0; b < 16; b++)
				bitmap.pix(y, x * 16 + b) = BIT(m_videoram[y * (720/16) + x], b);

	return 0;
}


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

void unixpc_state::unixpc_mem(address_map &map)
{
	map(0x000000, 0x3fffff).m(m_ramrombank, FUNC(address_map_bank_device::amap16));
	map(0x400000, 0x4007ff).ram().share("mapram");
	map(0x410000, 0x410001).r(FUNC(unixpc_state::gsr_r));
	map(0x420000, 0x427fff).ram().share("videoram");
	map(0x450000, 0x450001).r(FUNC(unixpc_state::tsr_r));
	map(0x460000, 0x460001).rw(FUNC(unixpc_state::diskdma_size_r), FUNC(unixpc_state::diskdma_size_w));
	map(0x470000, 0x470001).r(FUNC(unixpc_state::line_printer_r));
	map(0x480000, 0x480001).w(FUNC(unixpc_state::rtc_w));
	map(0x490000, 0x490001).select(0x7000).w(FUNC(unixpc_state::tcr_w));
	map(0x4a0000, 0x4a0000).w("mreg", FUNC(output_latch_device::write));
	map(0x4d0000, 0x4d7fff).w(FUNC(unixpc_state::diskdma_ptr_w));
	map(0x4e0001, 0x4e0001).w(FUNC(unixpc_state::disk_control_w)).cswidth(16);
	map(0x4f0001, 0x4f0001).w("printlatch", FUNC(output_latch_device::write));
	map(0xe00000, 0xe0000f).rw(m_hdc, FUNC(wd1010_device::read), FUNC(wd1010_device::write)).umask16(0x00ff);
	map(0xe10000, 0xe10007).rw(m_wd2797, FUNC(wd_fdc_device_base::read), FUNC(wd_fdc_device_base::write)).umask16(0x00ff);
	map(0xe30000, 0xe30001).r(FUNC(unixpc_state::rtc_r));
	map(0xe40000, 0xe40001).select(0x7000).w(FUNC(unixpc_state::gcr_w));
	map(0xe50000, 0xe50007).rw("mpsc", FUNC(upd7201_device::cd_ba_r), FUNC(upd7201_device::cd_ba_w)).umask16(0x00ff);
	map(0xe70000, 0xe70003).rw("kbc", FUNC(acia6850_device::read), FUNC(acia6850_device::write)).umask16(0xff00);
	map(0x800000, 0x803fff).mirror(0x7fc000).rom().region("bootrom", 0);
}

void unixpc_state::ramrombank_map(address_map &map)
{
	map(0x000000, 0x3fffff).rom().region("bootrom", 0);
	map(0x400000, 0x7fffff).rw(FUNC(unixpc_state::ram_mmu_r), FUNC(unixpc_state::ram_mmu_w));
}

/***************************************************************************
    INPUT PORTS
***************************************************************************/

static INPUT_PORTS_START( unixpc )
INPUT_PORTS_END


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

static void unixpc_floppies(device_slot_interface &device)
{
	device.option_add("525dd", FLOPPY_525_DD);
}

void unixpc_state::unixpc(machine_config &config)
{
	// basic machine hardware
	M68010(config, m_maincpu, 40_MHz_XTAL / 4);
	m_maincpu->set_addrmap(AS_PROGRAM, &unixpc_state::unixpc_mem);

	LS259(config, m_gcr); // 7K
	m_gcr->q_out_cb<0>().set(FUNC(unixpc_state::error_enable_w));
	m_gcr->q_out_cb<1>().set(FUNC(unixpc_state::parity_enable_w));
	m_gcr->q_out_cb<2>().set(FUNC(unixpc_state::bpplus_w));
	m_gcr->q_out_cb<3>().set(FUNC(unixpc_state::romlmap_w));

	LS259(config, m_tcr); // 10K

	INPUT_MERGER_ANY_HIGH(config, m_int02); // 26H pins 3-6
	m_int02->output_handler().set_inputline(m_maincpu, M68K_IRQ_2);

	output_latch_device &mreg(OUTPUT_LATCH(config, "mreg"));
	mreg.bit_handler<0>().set_output("led_0").invert();
	mreg.bit_handler<1>().set_output("led_1").invert();
	mreg.bit_handler<2>().set_output("led_2").invert();
	mreg.bit_handler<3>().set_output("led_3").invert();
	// bit 4 (D12) = 0 = modem baud rate from UART clock inputs, 1 = baud from programmable timer
	mreg.bit_handler<5>().set("printer", FUNC(centronics_device::write_strobe)).invert();
	// bit 6 (D14) = 0 for disk DMA write, 1 for disk DMA read
	// bit 7 (D15) = VBL ack (must go high-low-high to ack)

	// video hardware
	screen_device &screen(SCREEN(config, "screen", SCREEN_TYPE_RASTER));
	screen.set_screen_update(FUNC(unixpc_state::screen_update));
	screen.set_raw(40_MHz_XTAL / 2, 896, 0, 720, 367, 0, 348);
	screen.set_palette("palette");
	// vsync should actually last 17264 pixels

	config.set_default_layout(layout_unixpc);

	PALETTE(config, "palette", palette_device::MONOCHROME);

	// internal ram
	RAM(config, RAM_TAG).set_default_size("1M").set_extra_options("2M");

	// RAM/ROM bank
	ADDRESS_MAP_BANK(config, "ramrombank").set_map(&unixpc_state::ramrombank_map).set_options(ENDIANNESS_BIG, 16, 32, 0x400000);

	// floppy
	WD2797(config, m_wd2797, 40_MHz_XTAL / 40); // 1PCK (CPU clock) divided by custom DMA chip
	m_wd2797->intrq_wr_callback().set(FUNC(unixpc_state::wd2797_intrq_w));
	m_wd2797->drq_wr_callback().set(FUNC(unixpc_state::wd2797_drq_w));
	FLOPPY_CONNECTOR(config, "wd2797:0", unixpc_floppies, "525dd", floppy_image_device::default_floppy_formats);

	WD1010(config, m_hdc, 40_MHz_XTAL / 8);
	m_hdc->out_intrq_callback().set(FUNC(unixpc_state::wd1010_intrq_w));
	HARDDISK(config, m_hdr0, 0);

	upd7201_device &mpsc(UPD7201(config, "mpsc", 19.6608_MHz_XTAL / 8));
	mpsc.out_txda_callback().set("rs232", FUNC(rs232_port_device::write_txd));
	mpsc.out_dtra_callback().set("rs232", FUNC(rs232_port_device::write_dtr));
	mpsc.out_rtsa_callback().set("rs232", FUNC(rs232_port_device::write_rts));
	mpsc.out_int_callback().set_inputline(m_maincpu, M68K_IRQ_4);

	acia6850_device &kbc(ACIA6850(config, "kbc", 0));
	kbc.irq_handler().set_inputline(m_maincpu, M68K_IRQ_3);

	// TODO: RTC
	//TC8250(config, "rtc", 32.768_kHz_XTAL);

	rs232_port_device &rs232(RS232_PORT(config, "rs232", default_rs232_devices, nullptr));
	rs232.rxd_handler().set("mpsc", FUNC(upd7201_device::rxa_w));
	rs232.dsr_handler().set("mpsc", FUNC(upd7201_device::dcda_w));
	rs232.cts_handler().set("mpsc", FUNC(upd7201_device::ctsa_w));

	centronics_device &printer(CENTRONICS(config, "printer", centronics_devices, nullptr));
	output_latch_device &printlatch(OUTPUT_LATCH(config, "printlatch"));
	printer.set_output_latch(printlatch);
}


/***************************************************************************
    ROM DEFINITIONS
***************************************************************************/

// ROMs were provided by Michael Lee und imaged by Philip Pemberton
ROM_START( 3b1 )
	ROM_REGION16_BE(0x400000, "bootrom", 0)
	ROM_LOAD16_BYTE("72-00617.15c", 0x000000, 0x002000, CRC(4e93ff40) SHA1(1a97c8d32ec862f7f5fa1032f1688b76ea0672cc))
	ROM_LOAD16_BYTE("72-00616.14c", 0x000001, 0x002000, CRC(c61f7ae0) SHA1(ab3ac29935a2a587a083c4d175a5376badd39058))
ROM_END


/***************************************************************************
    GAME DRIVERS
***************************************************************************/

//    YEAR  NAME  PARENT  COMPAT  MACHINE  INPUT   CLASS         INIT        COMPANY  FULLNAME             FLAGS
COMP( 1985, 3b1,  0,      0,      unixpc,  unixpc, unixpc_state, empty_init, "AT&T",  "UNIX PC Model 3B1", MACHINE_NOT_WORKING | MACHINE_NO_SOUND )