summaryrefslogtreecommitdiffstatshomepage
path: root/src/mame/drivers/cms.cpp
blob: c57a4b50635fc744eed46215134238847b4b8c66 (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
// license:BSD-3-Clause
// copyright-holders:Nigel Barnes
// thanks-to:Phill Harvey-Smith
/***************************************************************************

    CMS 6502 Development System

    This is an industrial 6502 system in a rack chassis consisting of a
    back-plane and plug-in cards, with two 3.5" floppy disk drives, a
    "SIMON" System Monitor, DFS, and an extended version of BBC BASIC
    called MULTI-BASIC. It has an IBM-XT style keyboard.

    The "Eurocard" standard format cards are as follows:
    - 6502 2nd Processor For The BBC Micro (CMS0026 6502)
    - 40/80 Terminal Card (also handles the keyboard) (CMS 0010-3)
    - High Performance Colour Graphics Card (CMS Video-4)
    - Versatile Interface Board (CMS0006 Issue 4)
    - Analogue Digital Interface Board (CMS00092 A/D I/O)
    - Floppy Disk Controller

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

#include "emu.h"
#include "cpu/m6502/m6502.h"
#include "machine/6522via.h"
#include "machine/input_merger.h"
#include "bus/acorn/bus.h"
#include "coreutil.h"


class cms_state : public driver_device
{
public:
	cms_state(const machine_config &mconfig, device_type type, const char *tag)
		: driver_device(mconfig, type, tag)
		, m_maincpu(*this, "maincpu")
		, m_rom(*this, "rom")
		, m_bank1(*this, "bank1")
		, m_via(*this, "via")
		, m_irqs(*this, "irqs")
		, m_bus(*this, "bus")
		, m_map_select(0)
		, m_page_select(0)
	{ }

	//DECLARE_INPUT_CHANGED_MEMBER(trigger_reset);

	void cms6502(machine_config &config);

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

private:
	DECLARE_WRITE8_MEMBER(map_select_w);
	DECLARE_WRITE8_MEMBER(page_select_w);
	DECLARE_WRITE_LINE_MEMBER(bus_nmi_w);
	DECLARE_READ8_MEMBER(cms_rtc_r);
	DECLARE_WRITE8_MEMBER(cms_rtc_w);

	void cms_rtc_set_time();

	required_device<cpu_device> m_maincpu;
	required_memory_region m_rom;
	required_memory_bank m_bank1;
	required_device<via6522_device> m_via;
	required_device<input_merger_device> m_irqs;
	required_device<acorn_bus_device> m_bus;

	void cms_bank(address_map &map);
	void cms6502_mem(address_map &map);

	uint8_t m_map_select;
	uint8_t m_page_select;

	uint8_t m_rtc_data[0x10];
	int m_rtc_reg;
	int m_rtc_state;

	void device_timer(emu_timer &timer, device_timer_id id, int param, void *ptr) override;
	emu_timer* m_rtc_timer;

	enum
	{
		TIMER_RTC
	};
};


void cms_state::cms6502_mem(address_map &map)
{
	map.unmap_value_high();
	map(0x0000, 0x7fff).ram();  /* socket M1 43256C-12 32K RAM */
	map(0x8000, 0xbfff).bankr("bank1").w(FUNC(cms_state::page_select_w));
	map(0xc000, 0xffff).rom().region("mos", 0);
	map(0xfc00, 0xfc0f).rw(m_via, FUNC(via6522_device::read), FUNC(via6522_device::write));
	map(0xfc30, 0xfc3f).rw(FUNC(cms_state::cms_rtc_r), FUNC(cms_state::cms_rtc_w));
	map(0xfc70, 0xfc7f).w(FUNC(cms_state::map_select_w));
}


WRITE8_MEMBER(cms_state::map_select_w)
{
	m_map_select = (data & 0x03) << 2;
	logerror("map select %02x\n", data);
	//if (m_map_select == 0x00)
	//	m_bank1->set_entry(m_page_select);
	//else
		m_bank1->set_entry(m_map_select);
}

WRITE8_MEMBER(cms_state::page_select_w)
{
	logerror("page select %02x\n", data);
	m_page_select = data & 0x03;
	if (m_map_select == 0x00)
	{
		m_page_select = data & 0x03;
		m_bank1->set_entry(m_page_select);
	}
}


/* Input ports */
static INPUT_PORTS_START( cms )
INPUT_PORTS_END


void cms_state::machine_start()
{
	m_bank1->configure_entries(0, 16, m_rom->base(), 0x4000);

	memset(&m_rtc_data, 0, sizeof(m_rtc_data));
	m_rtc_reg = 0;
	m_rtc_state = 0;
	m_rtc_data[0xf] = 1;

	m_rtc_timer = timer_alloc();
	m_rtc_timer->adjust(attotime::zero, 0, attotime(1, 0));
}


void cms_state::machine_reset()
{
	m_bank1->set_entry(0);
}

/* Real Time Clock and NVRAM  EM M3002

reg 0: seconds
reg 1: minutes
reg 2: hours
reg 3: day 1 based
reg 4: month 1 based
reg 5: year
reg 6: week day
reg 7: week number
reg ..
reg 15: status

*/

void cms_state::cms_rtc_set_time()
{
	system_time systime;

	/* get the current date/time from the core */
	machine().current_datetime(systime);

	m_rtc_data[0] = dec_2_bcd(systime.utc_time.second);
	m_rtc_data[1] = dec_2_bcd(systime.utc_time.minute);
	m_rtc_data[2] = dec_2_bcd(systime.utc_time.hour);

	m_rtc_data[3] = dec_2_bcd(systime.utc_time.mday);
	m_rtc_data[4] = dec_2_bcd(systime.utc_time.month + 1);
	m_rtc_data[5] = dec_2_bcd(systime.utc_time.year % 100);
}

void cms_state::device_timer(emu_timer &timer, device_timer_id id, int param, void *ptr)
{
	int month, year;

	switch (id)
	{
	case TIMER_RTC:
		m_rtc_data[0] = bcd_adjust(m_rtc_data[0] + 1);
		if (m_rtc_data[0] >= 0x60)
		{
			m_rtc_data[0] = 0;
			m_rtc_data[1] = bcd_adjust(m_rtc_data[1] + 1);
			if (m_rtc_data[1] >= 0x60)
			{
				m_rtc_data[1] = 0;
				m_rtc_data[2] = bcd_adjust(m_rtc_data[2] + 1);
				if (m_rtc_data[2] >= 0x24)
				{
					m_rtc_data[2] = 0;
					m_rtc_data[3] = bcd_adjust(m_rtc_data[3] + 1);
					month = bcd_2_dec(m_rtc_data[4]);
					year = bcd_2_dec(m_rtc_data[5]) + 2000; // save for julian_days_in_month_calculation
					if (m_rtc_data[3]> gregorian_days_in_month(month, year))
					{
						m_rtc_data[3] = 1;
						m_rtc_data[4] = bcd_adjust(m_rtc_data[4] + 1);
						if (m_rtc_data[4]>0x12)
						{
							m_rtc_data[4] = 1;
							m_rtc_data[5] = bcd_adjust(m_rtc_data[5] + 1) & 0xff;
						}
					}
				}
			}
		}
		break;
	}
}

READ8_MEMBER(cms_state::cms_rtc_r)
{
	int data = 0;

	switch (m_rtc_state)
	{
	case 1:
		data = (m_rtc_data[m_rtc_reg] & 0xf0) >> 4;
		m_rtc_state++;
		break;
	case 2:
		data = m_rtc_data[m_rtc_reg] & 0xf;
		m_rtc_state = 0;
		break;
	}
	return data;
}

WRITE8_MEMBER(cms_state::cms_rtc_w)
{
	switch (m_rtc_state)
	{
	case 0:
		m_rtc_reg = data;
		m_rtc_state = 1;
		break;
	case 1:
		m_rtc_data[m_rtc_reg] = (m_rtc_data[m_rtc_reg] & ~0xf0) | ((data & 0xf) << 4);
		m_rtc_state++;
		break;
	case 2:
		m_rtc_data[m_rtc_reg] = (m_rtc_data[m_rtc_reg] & ~0xf) | (data & 0xf);
		m_rtc_state = 0;
		break;
	}
}


WRITE_LINE_MEMBER(cms_state::bus_nmi_w)
{
	m_maincpu->set_input_line(INPUT_LINE_NMI, state);
}


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

void cms_state::cms6502(machine_config &config)
{
	M6502(config, m_maincpu, 1_MHz_XTAL);
	m_maincpu->set_addrmap(AS_PROGRAM, &cms_state::cms6502_mem);

	INPUT_MERGER_ANY_HIGH(config, m_irqs).output_handler().set_inputline(m_maincpu, M6502_IRQ_LINE);

	VIA6522(config, m_via, 1_MHz_XTAL);
	//m_via->cb2_handler().set(FUNC(cms_state::cass_w));
	m_via->irq_handler().set("irqs", FUNC(input_merger_device::in_w<0>));

	/* 7 Slot Backplane */
	ACORN_BUS(config, m_bus, 0);
	m_bus->set_cputag(m_maincpu);
	m_bus->out_irq_callback().set(m_irqs, FUNC(input_merger_device::in_w<1>));
	m_bus->out_nmi_callback().set(FUNC(cms_state::bus_nmi_w));
	ACORN_BUS_SLOT(config, "bus1", m_bus, cms_bus_devices, "4080term");
	ACORN_BUS_SLOT(config, "bus2", m_bus, cms_bus_devices, nullptr);
	ACORN_BUS_SLOT(config, "bus3", m_bus, cms_bus_devices, "fdc");
	ACORN_BUS_SLOT(config, "bus4", m_bus, cms_bus_devices, "hires");
	ACORN_BUS_SLOT(config, "bus5", m_bus, cms_bus_devices, nullptr);
	ACORN_BUS_SLOT(config, "bus6", m_bus, cms_bus_devices, nullptr);
}


/***************************************************************************
    ROM definitions
***************************************************************************/

ROM_START( cms6502 )
	ROM_REGION(0x04000, "mos", 0) /* 27128 */
	ROM_LOAD("6502 system os.m5", 0x0000, 0x4000, CRC(1b6da63d) SHA1(5c0afc55288ad86e1d6e653dda9c5dcccdaf0ff2))

	ROM_REGION(0x40000, "rom", 0)
	/* Socket M4 27513 */
	ROM_LOAD("basic.m4",       0x00000, 0x4000, CRC(e27b6146) SHA1(ae89ee695bed6f49402f009ded16ad3a36f64c28))
	ROM_LOAD("dfs-1.4.m4",     0x04000, 0x4000, CRC(0743ddb5) SHA1(cd61956a10510a6954cba9ba17f70c2991e81d9b))
	ROM_LOAD("simon-2.02.m4",  0x08000, 0x4000, CRC(d1f1b633) SHA1(991c3691a70f45fff3c828c8c0a0906b9f5e34fc))
	ROM_LOAD("multi-basic.m4", 0x0c000, 0x4000, CRC(fb785563) SHA1(9f97582ba0b82f314008bf95eacb00e7bced3cac))
	/* Socket M3 empty */
	/* Socket M2 27128 */
	ROM_LOAD("gdp.m2",         0x20000, 0x4000, CRC(f545293b) SHA1(532c45ac4661643c6c6f633d504ef72e800cc900))
	/* Socket M1 contains RAM, not mapped as ROM */

	ROM_REGION(0x200, "proms", 0)
	ROM_LOAD("bassys2.ic8", 0x0000, 0x0200, CRC(417ff0b4) SHA1(878718accb83f18456fefaf67a0e4a6a407113e4)) // 512x8
ROM_END


/* Driver */

/*    YEAR  NAME     PARENT  COMPAT  MACHINE  INPUT  CLASS      INIT        COMPANY                             FULLNAME                       FLAGS */
COMP( 1986, cms6502, 0,      0,      cms6502, cms,   cms_state, empty_init, "Cambridge Microprocessor Systems", "CMS 6502 Development System", MACHINE_NOT_WORKING | MACHINE_NO_SOUND_HW )