summaryrefslogtreecommitdiffstatshomepage
path: root/src/mame/drivers/ti990_4.c
blob: b18fe23ff34c2ddef996e8dbed10b2ad08f77b15 (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
// license:LGPL-2.1+
// copyright-holders:Michael Zapf
/*
    ti990/4 driver

    We emulate a basic ti990/4 board, with a FD800 disk controller and an 733
    ASR terminal.  A little floppy-based software for this computer is
    available thanks to efforts by Dave Pitts: mostly, Forth and TX990.


    Board setup options:
    8kb of DRAM (onboard option, with optional parity): base 0x0000 or 0x2000
    4 banks of 512 bytes of ROM or SRAM: base 0x0000, 0x0800, 0xF000 or 0xF800
    power-up vector: 0x0000 (level 0) or 0xFFFC (load)
    optional memerr interrupt (level 2)
    optional power fail interrupt (level 1)
    optional real-time clock interrupt (level 5 or 7)


    Setup for the emulated system:
    0x0000: 8kb on-board DRAM + 24kb extension RAM (total 32kb)
    0xF800: 512 bytes SRAM
    0xFA00: 512 bytes SRAM (or empty?)
    0xFC00: 512 bytes self-test ROM
    0xFE00: 512 bytes loader ROM
    power-up vector: 0xFFFC (load)

    Note that only interrupt levels 3-7 are supported by the board (8-15 are not wired).

TODO:
* finish ASR emulation
* programmer panel
* emulate other devices: card reader, printer

    Original implementation: Raphael Nabet

    Rewritten by Michael Zapf 2014
*/

#include "emu.h"
#include "cpu/tms9900/tms9900.h"

#include "video/911_vdt.h"
#include "sound/beep.h"
#include "video/733_asr.h"

#include "bus/ti99x/990_dk.h"


class ti990_4_state : public driver_device
{
public:
	ti990_4_state(const machine_config &mconfig, device_type type, const char *tag)
		: driver_device(mconfig, type, tag),
		m_maincpu(*this, "maincpu"),
		m_fd800(*this, "fd800") { }

	DECLARE_READ8_MEMBER( panel_read );
	DECLARE_WRITE8_MEMBER( panel_write );
	DECLARE_WRITE8_MEMBER( external_operation );
	DECLARE_READ8_MEMBER( interrupt_level );
	DECLARE_WRITE_LINE_MEMBER( fd_interrupt );
	DECLARE_WRITE_LINE_MEMBER( asrkey_interrupt );
	DECLARE_WRITE_LINE_MEMBER( vdtkey_interrupt );
	DECLARE_WRITE_LINE_MEMBER( line_interrupt );

	DECLARE_DRIVER_INIT(ti990_4);
	DECLARE_DRIVER_INIT(ti990_4v);

	DECLARE_MACHINE_RESET(ti990_4);

private:
	void        hold_load();
	void        device_timer(emu_timer &timer, device_timer_id id, int param, void *ptr);
	int         m_intlines;
	int         m_int_level;
	emu_timer*  m_nmi_timer;
	void        reset_int_lines();
	void        set_int_line(int line, int state);

	bool        m_ckon_state;

	// Connected devices
	required_device<tms9900_device>     m_maincpu;
	required_device<fd800_legacy_device> m_fd800;
};

enum
{
	NMI_TIMER_ID = 1
};

void ti990_4_state::hold_load()
{
	m_maincpu->set_input_line(INT_9900_LOAD, ASSERT_LINE);
	logerror("ti990_4: Triggering LOAD interrupt\n");
	m_nmi_timer->adjust(attotime::from_msec(100));
}

/*
    LOAD interrupt trigger callback
*/
void ti990_4_state::device_timer(emu_timer &timer, device_timer_id id, int param, void *ptr)
{
	m_maincpu->set_input_line(INT_9900_LOAD, CLEAR_LINE);
	logerror("ti990_4: Released LOAD interrupt\n");
}

READ8_MEMBER( ti990_4_state::panel_read )
{
	if (offset == 1)
		return 0x48;

	return 0;
}

WRITE8_MEMBER( ti990_4_state::panel_write )
{
	logerror("ti990_4: writing to panel @CRU %04x: %02x\n", offset<<1, data);
}

void ti990_4_state::set_int_line(int line, int state)
{
	if (state)
		m_intlines |= (1 << line);
	else
		m_intlines &= ~(1 << line);

	if (m_intlines != 0)
	{
		m_int_level = 0;
		while ((m_intlines & (1 << m_int_level))==0) m_int_level++;
		logerror("ti990_4: Setting int level to %x\n", m_int_level);
		m_maincpu->set_input_line(INT_9900_INTREQ, ASSERT_LINE);
	}
	else
		m_maincpu->set_input_line(INT_9900_INTREQ, CLEAR_LINE);
}

void ti990_4_state::reset_int_lines()
{
	m_intlines = 0;
}

/*
    Callback from the floppy controller.
*/
WRITE_LINE_MEMBER(ti990_4_state::fd_interrupt)
{
	set_int_line(7, state);
}

/*
    Connection to VDT
*/
WRITE_LINE_MEMBER(ti990_4_state::vdtkey_interrupt)
{
	set_int_line(3, state);
}

WRITE_LINE_MEMBER(ti990_4_state::line_interrupt)
{
	if (m_ckon_state) set_int_line(5, state);
}

/*
    Callback from the terminal.
*/
WRITE_LINE_MEMBER(ti990_4_state::asrkey_interrupt)
{
	set_int_line(6, state);
}

WRITE8_MEMBER( ti990_4_state::external_operation )
{
	static const char* extop[8] = { "inv1", "inv2", "IDLE", "RSET", "inv3", "CKON", "CKOF", "LREX" };
	switch (offset)
	{
	case IDLE_OP:
		return;
	case RSET_OP:
		m_ckon_state = false;
		// clear controller panel and smi fault LEDs
		break;
	case CKON_OP:
		m_ckon_state = true;
		break;
	case CKOF_OP:
		m_ckon_state = false;
		set_int_line(5, 0);
		break;
	case LREX_OP:
		// TODO: Verify this
		hold_load();
		break;

	default:
		logerror("ti99_4x: External operation %s not implemented on TI-990/4 board\n", extop[offset]);
	}
}

READ8_MEMBER( ti990_4_state::interrupt_level )
{
	return m_int_level;
}

/*
    Memory map - see description above
*/

static ADDRESS_MAP_START(memmap, AS_PROGRAM, 16, ti990_4_state )
	AM_RANGE(0x0000, 0x7fff) AM_RAM /* dynamic RAM */
	AM_RANGE(0x8000, 0xf7ff) AM_NOP /* reserved for expansion */
	AM_RANGE(0xf800, 0xfbff) AM_RAM /* static RAM? */
	AM_RANGE(0xfc00, 0xffff) AM_ROM /* LOAD ROM */
ADDRESS_MAP_END


/*
    CRU map

    0x000-0xF7F: user devices
    0xF80-0xF9F: CRU interrupt + expansion control
    0xFA0-0xFAF: TILINE coupler interrupt control
    0xFB0-0xFCF: reserved
    0xFD0-0xFDF: memory mapping and memory protect
    0xFE0-0xFEF: internal interrupt control
    0xFF0-0xFFF: front panel

    Default user map:
    0x000-0x00f: 733 ASR (int 6)
    0x010-0x01f: PROM programmer (wired to int 15, unused)
    0x020-0x02f: 804 card reader (int 4)
    0x030-0x03f: line printer (wired to int 14, unused)
    0x040-0x05f: FD800 floppy controller (int 7)
    0x060-0x07f: VDT1 (int 3 - wired to int 11, unused)
    0x080-0x09f: VDT2, or CRU expansion (int ??? - wired to int 10, unused)
    0x0a0-0x0bf: VDT3 (int ??? - wired to int 9, unused)
*/

static ADDRESS_MAP_START(cru_map, AS_IO, 8, ti990_4_state )
	AM_RANGE(0x00, 0x01) AM_DEVREAD("asr733", asr733_device, cru_r)
	AM_RANGE(0x00, 0x0f) AM_DEVWRITE("asr733", asr733_device, cru_w)

	AM_RANGE(0x08, 0x0b) AM_DEVREAD( "fd800", fd800_legacy_device, cru_r )
	AM_RANGE(0x40, 0x5f) AM_DEVWRITE( "fd800", fd800_legacy_device, cru_w )

	AM_RANGE(0x1fe, 0x1ff) AM_READ( panel_read )
	AM_RANGE(0xff0, 0xfff) AM_WRITE( panel_write )
ADDRESS_MAP_END

static ADDRESS_MAP_START(cru_map_v, AS_IO, 8, ti990_4_state )
	AM_RANGE(0x10, 0x11) AM_DEVREAD("vdt911", vdt911_device, cru_r)
	AM_RANGE(0x80, 0x8f) AM_DEVWRITE("vdt911", vdt911_device, cru_w)

	AM_RANGE(0x08, 0x0b) AM_DEVREAD( "fd800", fd800_legacy_device, cru_r )
	AM_RANGE(0x40, 0x5f) AM_DEVWRITE( "fd800", fd800_legacy_device, cru_w )

	AM_RANGE(0x1fe, 0x1ff) AM_READ( panel_read )
	AM_RANGE(0xff0, 0xfff) AM_WRITE( panel_write )
ADDRESS_MAP_END


/* static const floppy_interface ti990_4_floppy_interface =
{
    FLOPPY_STANDARD_8_DSSD,
    LEGACY_FLOPPY_OPTIONS_NAME(fd800),
    NULL
}; */

MACHINE_RESET_MEMBER(ti990_4_state,ti990_4)
{
	hold_load();
	reset_int_lines();
	m_ckon_state = false;
	m_maincpu->set_ready(ASSERT_LINE);
}

DRIVER_INIT_MEMBER(ti990_4_state, ti990_4)
{
	m_nmi_timer = timer_alloc(NMI_TIMER_ID);
}

static MACHINE_CONFIG_START( ti990_4, ti990_4_state )
	/* basic machine hardware */
	/* TMS9900 CPU @ 3.0(???) MHz */
	MCFG_TMS99xx_ADD("maincpu", TMS9900, 3000000, memmap, cru_map)
	MCFG_TMS99xx_EXTOP_HANDLER( WRITE8(ti990_4_state, external_operation) )
	MCFG_TMS99xx_INTLEVEL_HANDLER( READ8(ti990_4_state, interrupt_level) )

	MCFG_MACHINE_RESET_OVERRIDE(ti990_4_state, ti990_4 )

	// Terminal
	MCFG_DEVICE_ADD("asr733", ASR733, 0)
	MCFG_ASR733_KEYINT_HANDLER(WRITELINE(ti990_4_state, asrkey_interrupt))
	MCFG_ASR733_LINEINT_HANDLER(WRITELINE(ti990_4_state, line_interrupt))

	// Floppy controller
	MCFG_DEVICE_ADD("fd800", FD800, 0)
	MCFG_FD800_INT_HANDLER(WRITELINE(ti990_4_state, fd_interrupt))

//  MCFG_LEGACY_FLOPPY_4_DRIVES_ADD(ti990_4_floppy_interface)
MACHINE_CONFIG_END

static MACHINE_CONFIG_START( ti990_4v, ti990_4_state )
	/* basic machine hardware */
	/* TMS9900 CPU @ 3.0(???) MHz */
	MCFG_TMS99xx_ADD("maincpu", TMS9900, 3000000, memmap, cru_map_v)
	MCFG_TMS99xx_EXTOP_HANDLER( WRITE8(ti990_4_state, external_operation) )
	MCFG_TMS99xx_INTLEVEL_HANDLER( READ8(ti990_4_state, interrupt_level) )
	MCFG_MACHINE_RESET_OVERRIDE(ti990_4_state, ti990_4 )

	// Terminal
	MCFG_DEVICE_ADD("vdt911", VDT911, 0)
	MCFG_VDT911_KEYINT_HANDLER(WRITELINE(ti990_4_state, vdtkey_interrupt))
	MCFG_VDT911_LINEINT_HANDLER(WRITELINE(ti990_4_state, line_interrupt))

	// Floppy controller
	MCFG_DEVICE_ADD("fd800", FD800, 0)
	MCFG_FD800_INT_HANDLER(WRITELINE(ti990_4_state, fd_interrupt))

//  MCFG_LEGACY_FLOPPY_4_DRIVES_ADD(ti990_4_floppy_interface)
MACHINE_CONFIG_END

/*
  ROM loading
*/
ROM_START(ti990_4)
	/*CPU memory space*/
	ROM_REGION16_BE(0x10000, "maincpu",0)

#if 0
	/* ROM set 945121-5: "733 ASR ROM loader with self test (prototyping)"
	(cf 945401-9701 pp. 1-19) */

	/* test ROM */
	ROMX_LOAD("94519209.u39", 0xFC00, 0x100, CRC(0a0b0c42), ROM_NIBBLE | ROM_SHIFT_NIBBLE_HI | ROM_SKIP(1))
	ROMX_LOAD("94519210.u55", 0xFC00, 0x100, CRC(d078af61), ROM_NIBBLE | ROM_SHIFT_NIBBLE_LO | ROM_SKIP(1))
	ROMX_LOAD("94519211.u61", 0xFC01, 0x100, CRC(6cf7d4a0), ROM_NIBBLE | ROM_SHIFT_NIBBLE_HI | ROM_SKIP(1))
	ROMX_LOAD("94519212.u78", 0xFC01, 0x100, CRC(d9522458), ROM_NIBBLE | ROM_SHIFT_NIBBLE_LO | ROM_SKIP(1))

	/* LOAD ROM */
	ROMX_LOAD("94519113.u3", 0xFE00, 0x100, CRC(8719b04e), ROM_NIBBLE | ROM_SHIFT_NIBBLE_HI | ROM_SKIP(1))
	ROMX_LOAD("94519114.u4", 0xFE00, 0x100, CRC(72a040e0), ROM_NIBBLE | ROM_SHIFT_NIBBLE_LO | ROM_SKIP(1))
	ROMX_LOAD("94519115.u6", 0xFE01, 0x100, CRC(9ccf8cca), ROM_NIBBLE | ROM_SHIFT_NIBBLE_HI | ROM_SKIP(1))
	ROMX_LOAD("94519116.u7", 0xFE01, 0x100, CRC(fa387bf3), ROM_NIBBLE | ROM_SHIFT_NIBBLE_LO | ROM_SKIP(1))

#else
	/* ROM set 945121-4(?): "Floppy disc loader with self test" (cf 945401-9701 pp. 1-19) */
	ROM_LOAD16_WORD("ti9904.rom", 0xFC00, 0x400, CRC(691e7d19) SHA1(58d9bed80490fdf71c743bfd3077c70840b7df8c))
#endif

	ROM_REGION(asr733_chr_region_len, asr733_chr_region, ROMREGION_ERASEFF)
ROM_END

ROM_START(ti990_4v)
	/*CPU memory space*/
	ROM_REGION16_BE(0x10000, "maincpu",0)
	ROM_LOAD16_WORD("ti9904.rom", 0xFC00, 0x400, CRC(691e7d19) SHA1(58d9bed80490fdf71c743bfd3077c70840b7df8c))

	/* VDT911 character definitions */
	ROM_REGION(vdt911_chr_region_len, vdt911_chr_region, ROMREGION_ERASEFF)
ROM_END

/*    YEAR  NAME        PARENT  COMPAT  MACHINE     INPUT       INIT        COMPANY                 FULLNAME */
COMP( 1976, ti990_4,  0,      0,      ti990_4,    0, ti990_4_state, ti990_4,    "Texas Instruments",    "TI Model 990/4 Microcomputer System" , MACHINE_NOT_WORKING | MACHINE_NO_SOUND )
COMP( 1976, ti990_4v, ti990_4,      0,      ti990_4v,   0, ti990_4_state, ti990_4,    "Texas Instruments",    "TI Model 990/4 Microcomputer System with Video Display Terminal" , MACHINE_NOT_WORKING | MACHINE_NO_SOUND )