summaryrefslogtreecommitdiffstatshomepage
path: root/src/mame/drivers/tk2000.cpp
blob: b0388847059bb2e488ca684de471dee0d7181ec8 (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
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
// license:BSD-3-Clause
// copyright-holders:R. Belmont
/***************************************************************************

    tk2000.cpp - Microdigital TK2000

    Driver by R. Belmont

    This system is only vaguely Apple II compatible.
    The keyboard works entirely differently, which is a big deal.

    $C05A - banks RAM from c100-ffff
    $C05B - banks ROM from c100-ffff

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

#include "emu.h"
#include "video/apple2.h"

#include "cpu/m6502/m6502.h"
#include "imagedev/cassette.h"
#include "imagedev/flopdrv.h"
#include "machine/bankdev.h"
#include "machine/ram.h"
#include "machine/timer.h"
#include "sound/spkrdev.h"

#include "screen.h"
#include "speaker.h"

#include "formats/ap2_dsk.h"


#define A2_CPU_TAG "maincpu"
#define A2_BUS_TAG "a2bus"
#define A2_SPEAKER_TAG "speaker"
#define A2_CASSETTE_TAG "tape"
#define A2_UPPERBANK_TAG "inhbank"
#define A2_VIDEO_TAG "a2video"

class tk2000_state : public driver_device
{
public:
	tk2000_state(const machine_config &mconfig, device_type type, const char *tag)
		: driver_device(mconfig, type, tag),
		m_maincpu(*this, A2_CPU_TAG),
		m_ram(*this, RAM_TAG),
		m_screen(*this, "screen"),
		m_video(*this, A2_VIDEO_TAG),
		m_row0(*this, "ROW0"),
		m_row1(*this, "ROW1"),
		m_row2(*this, "ROW2"),
		m_row3(*this, "ROW3"),
		m_row4(*this, "ROW4"),
		m_row5(*this, "ROW5"),
		m_row6(*this, "ROW6"),
		m_row7(*this, "ROW7"),
		m_kbspecial(*this, "keyb_special"),
		m_sysconfig(*this, "a2_config"),
		m_speaker(*this, A2_SPEAKER_TAG),
		m_cassette(*this, A2_CASSETTE_TAG),
		m_upperbank(*this, A2_UPPERBANK_TAG)
		{ }

	void tk2000(machine_config &config);

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

private:
	required_device<cpu_device> m_maincpu;
	required_device<ram_device> m_ram;
	required_device<screen_device> m_screen;
	required_device<a2_video_device> m_video;
	required_ioport m_row0, m_row1, m_row2, m_row3, m_row4, m_row5, m_row6, m_row7;
	required_ioport m_kbspecial;
	required_ioport m_sysconfig;
	required_device<speaker_sound_device> m_speaker;
	required_device<cassette_image_device> m_cassette;
	required_device<address_map_bank_device> m_upperbank;

	int m_speaker_state;
	int m_cassette_state;

	uint8_t m_strobe;

	bool m_page2;

	uint8_t *m_ram_ptr;
	int m_ram_size;

	TIMER_DEVICE_CALLBACK_MEMBER(apple2_interrupt);

	DECLARE_PALETTE_INIT(tk2000);
	uint32_t screen_update(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect);

	DECLARE_READ8_MEMBER(ram_r);
	DECLARE_WRITE8_MEMBER(ram_w);
	DECLARE_READ8_MEMBER(c000_r);
	DECLARE_WRITE8_MEMBER(c000_w);
	DECLARE_READ8_MEMBER(c080_r);
	DECLARE_WRITE8_MEMBER(c080_w);
	DECLARE_READ8_MEMBER(c100_r);
	DECLARE_WRITE8_MEMBER(c100_w);

	void apple2_map(address_map &map);
	void inhbank_map(address_map &map);

	void do_io(address_space &space, int offset);
	uint8_t read_floatingbus();
};

/***************************************************************************
    START/RESET
***************************************************************************/

void tk2000_state::machine_start()
{
	m_ram_ptr = m_ram->pointer();
	m_ram_size = m_ram->size();
	m_speaker_state = 0;
	m_speaker->level_w(m_speaker_state);
	m_cassette_state = 0;
	m_cassette->output(-1.0f);
	m_upperbank->set_bank(0);

	// setup save states
	save_item(NAME(m_speaker_state));
	save_item(NAME(m_cassette_state));
	save_item(NAME(m_strobe));
	save_item(NAME(m_page2));

	// setup video pointers
	m_video->m_ram_ptr = m_ram_ptr;
	m_video->m_aux_ptr = m_ram_ptr;
	m_video->m_char_ptr = nullptr;
	m_video->m_char_size = 0;
}

void tk2000_state::machine_reset()
{
	m_page2 = false;
	m_strobe = 0;
}

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

TIMER_DEVICE_CALLBACK_MEMBER(tk2000_state::apple2_interrupt)
{
	int scanline = param;

	if((scanline % 8) == 0)
		m_screen->update_partial(m_screen->vpos());

	// update the video system's shadow copy of the system config at the end of the frame
	if (scanline == 192)
	{
		m_video->m_sysconfig = m_sysconfig->read();
	}
}

PALETTE_INIT_MEMBER(tk2000_state, tk2000)
{
	m_video->palette_init_apple2(palette);
}

uint32_t tk2000_state::screen_update(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect)
{
	m_video->hgr_update(screen, bitmap, cliprect, 0, 191);
	return 0;
}

/***************************************************************************
    I/O
***************************************************************************/
// most softswitches don't care about read vs write, so handle them here
void tk2000_state::do_io(address_space &space, int offset)
{
	if(machine().side_effects_disabled())
	{
		return;
	}

	switch (offset)
	{
		case 0x20:
			m_cassette_state ^= 1;
			m_cassette->output(m_cassette_state ? 1.0f : -1.0f);
			break;

		case 0x30:
			m_speaker_state ^= 1;
			m_speaker->level_w(m_speaker_state);
			break;

		case 0x50:  // monochrome
			break;

		case 0x51:  // color
			break;

		case 0x54:  // set page 1
			m_page2 = false;
			m_video->m_page2 = false;
			break;

		case 0x55:  // set page 2
			m_page2 = true;
			m_video->m_page2 = true;
			break;

		case 0x5a:  // ROM
			m_upperbank->set_bank(0);
			break;

		case 0x5b:  // RAM
			m_upperbank->set_bank(1);
			break;

		case 0x5e:
			break;

		default:
			printf("do_io: unk access @ $C0%02X\n", offset & 0xff);
			break;
	}
}

READ8_MEMBER(tk2000_state::c000_r)
{
	switch (offset)
	{
		case 0x00:
			return 0;

		case 0x10:  // keyboard strobe
			return m_strobe;

		case 0x60: // cassette in
		case 0x68:
			return m_cassette->input() > 0.0 ? 0x80 : 0;

		default:
			do_io(space, offset);
			break;
	}

	return read_floatingbus();
}

WRITE8_MEMBER(tk2000_state::c000_w)
{
	switch (offset)
	{
		case 0x00:  // write row mask for keyboard scan
			switch (data)
			{
				case 0:
					break;

				case 0x01: m_strobe = m_row0->read(); break;
				case 0x02: m_strobe = m_row1->read(); break;
				case 0x04: m_strobe = m_row2->read(); break;
				case 0x08: m_strobe = m_row3->read(); break;
				case 0x10: m_strobe = m_row4->read(); break;
				case 0x20: m_strobe = m_row5->read(); break;
				case 0x40: m_strobe = m_row6->read(); break;
				case 0x80: m_strobe = m_row7->read(); break;
			}
			break;

		case 0x5f:
			m_strobe = m_kbspecial->read();
			break;

		default:
			do_io(space, offset);
			break;
	}
}

READ8_MEMBER(tk2000_state::c080_r)
{
	return read_floatingbus();
}

WRITE8_MEMBER(tk2000_state::c080_w)
{
}

READ8_MEMBER(tk2000_state::c100_r)
{
	return m_ram_ptr[offset + 0xc100];
}

WRITE8_MEMBER(tk2000_state::c100_w)
{
	m_ram_ptr[offset + 0xc100] = data;
}

// floating bus code from old machine/apple2: needs to be reworked based on real beam position to enable e.g. Bob Bishop's screen splitter
uint8_t tk2000_state::read_floatingbus()
{
	enum
	{
		// scanner types
		kScannerNone = 0, kScannerApple2, kScannerApple2e,

		// scanner constants
		kHBurstClock      =    53, // clock when Color Burst starts
		kHBurstClocks     =     4, // clocks per Color Burst duration
		kHClock0State     =  0x18, // H[543210] = 011000
		kHClocks          =    65, // clocks per horizontal scan (including HBL)
		kHPEClock         =    40, // clock when HPE (horizontal preset enable) goes low
		kHPresetClock     =    41, // clock when H state presets
		kHSyncClock       =    49, // clock when HSync starts
		kHSyncClocks      =     4, // clocks per HSync duration
		kNTSCScanLines    =   262, // total scan lines including VBL (NTSC)
		kNTSCVSyncLine    =   224, // line when VSync starts (NTSC)
		kPALScanLines     =   312, // total scan lines including VBL (PAL)
		kPALVSyncLine     =   264, // line when VSync starts (PAL)
		kVLine0State      = 0x100, // V[543210CBA] = 100000000
		kVPresetLine      =   256, // line when V state presets
		kVSyncLines       =     4, // lines per VSync duration
		kClocksPerVSync   = kHClocks * kNTSCScanLines // FIX: NTSC only?
	};

	// vars
	//
	int i, Hires, Mixed, Page2, _80Store, ScanLines, /* VSyncLine, ScanCycles,*/
		h_clock, h_state, h_0, h_1, h_2, h_3, h_4, h_5,
		v_line, v_state, v_A, v_B, v_C, v_0, v_1, v_2, v_3, v_4, /* v_5, */
		_hires, addend0, addend1, addend2, sum, address;

	// video scanner data
	//
	i = m_maincpu->total_cycles() % kClocksPerVSync; // cycles into this VSync

	// machine state switches
	//
	Hires    = 1; //m_video->m_hires ? 1 : 0;
	Mixed    = 0; //m_video->m_mix ? 1 : 0;
	Page2    = m_page2 ? 1 : 0;
	_80Store = 0;

	// calculate video parameters according to display standard
	//
	ScanLines  = 1 ? kNTSCScanLines : kPALScanLines; // FIX: NTSC only?
	// VSyncLine  = 1 ? kNTSCVSyncLine : kPALVSyncLine; // FIX: NTSC only?
	// ScanCycles = ScanLines * kHClocks;

	// calculate horizontal scanning state
	//
	h_clock = (i + kHPEClock) % kHClocks; // which horizontal scanning clock
	h_state = kHClock0State + h_clock; // H state bits
	if (h_clock >= kHPresetClock) // check for horizontal preset
	{
		h_state -= 1; // correct for state preset (two 0 states)
	}
	h_0 = (h_state >> 0) & 1; // get horizontal state bits
	h_1 = (h_state >> 1) & 1;
	h_2 = (h_state >> 2) & 1;
	h_3 = (h_state >> 3) & 1;
	h_4 = (h_state >> 4) & 1;
	h_5 = (h_state >> 5) & 1;

	// calculate vertical scanning state
	//
	v_line  = i / kHClocks; // which vertical scanning line
	v_state = kVLine0State + v_line; // V state bits
	if ((v_line >= kVPresetLine)) // check for previous vertical state preset
	{
		v_state -= ScanLines; // compensate for preset
	}
	v_A = (v_state >> 0) & 1; // get vertical state bits
	v_B = (v_state >> 1) & 1;
	v_C = (v_state >> 2) & 1;
	v_0 = (v_state >> 3) & 1;
	v_1 = (v_state >> 4) & 1;
	v_2 = (v_state >> 5) & 1;
	v_3 = (v_state >> 6) & 1;
	v_4 = (v_state >> 7) & 1;
	//v_5 = (v_state >> 8) & 1;

	// calculate scanning memory address
	//
	_hires = Hires;
	if (Hires && Mixed && (v_4 & v_2))
	{
		_hires = 0; // (address is in text memory)
	}

	addend0 = 0x68; // 1            1            0            1
	addend1 =              (h_5 << 5) | (h_4 << 4) | (h_3 << 3);
	addend2 = (v_4 << 6) | (v_3 << 5) | (v_4 << 4) | (v_3 << 3);
	sum     = (addend0 + addend1 + addend2) & (0x0F << 3);

	address = 0;
	address |= h_0 << 0; // a0
	address |= h_1 << 1; // a1
	address |= h_2 << 2; // a2
	address |= sum;      // a3 - aa6
	address |= v_0 << 7; // a7
	address |= v_1 << 8; // a8
	address |= v_2 << 9; // a9
	address |= ((_hires) ? v_A : (1 ^ (Page2 & (1 ^ _80Store)))) << 10; // a10
	address |= ((_hires) ? v_B : (Page2 & (1 ^ _80Store))) << 11; // a11
	if (_hires) // hires?
	{
		// Y: insert hires only address bits
		//
		address |= v_C << 12; // a12
		address |= (1 ^ (Page2 & (1 ^ _80Store))) << 13; // a13
		address |= (Page2 & (1 ^ _80Store)) << 14; // a14
	}
	else
	{
		// N: text, so no higher address bits unless Apple ][, not Apple //e
		//
		if ((1) && // Apple ][? // FIX: check for Apple ][? (FB is most useful in old games)
			(kHPEClock <= h_clock) && // Y: HBL?
			(h_clock <= (kHClocks - 1)))
		{
			address |= 1 << 12; // Y: a12 (add $1000 to address!)
		}
	}

	return m_ram_ptr[address % m_ram_size]; // FIX: this seems to work, but is it right!?
}

/***************************************************************************
    ADDRESS MAP
***************************************************************************/

READ8_MEMBER(tk2000_state::ram_r)
{
	if (offset < m_ram_size)
	{
		return m_ram_ptr[offset];
	}

	return 0xff;
}

WRITE8_MEMBER(tk2000_state::ram_w)
{
	if (offset < m_ram_size)
	{
		m_ram_ptr[offset] = data;
	}
}

void tk2000_state::apple2_map(address_map &map)
{
	map(0x0000, 0xbfff).rw(FUNC(tk2000_state::ram_r), FUNC(tk2000_state::ram_w));
	map(0xc000, 0xc07f).rw(FUNC(tk2000_state::c000_r), FUNC(tk2000_state::c000_w));
	map(0xc080, 0xc0ff).rw(FUNC(tk2000_state::c080_r), FUNC(tk2000_state::c080_w));
	map(0xc100, 0xffff).m(m_upperbank, FUNC(address_map_bank_device::amap8));
}

void tk2000_state::inhbank_map(address_map &map)
{
	map(0x0000, 0x3eff).rom().region("maincpu", 0x100);
	map(0x4000, 0x7eff).rw(FUNC(tk2000_state::c100_r), FUNC(tk2000_state::c100_w));
}

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

/*
    TK2000 matrix:

          0  1 2 3 4 5 6 7
       0SHIF B V C X Z
       1     G F D S A
       2 SPC T R E W Q
       3 LFT 5 4 3 2 1
       4 RGT 6 7 8 9 0
       5 DWN Y U I O P
       6 UP  H J K L :
       7 RTN N M , . ?

       write row mask 1/2/4/8/10/20/40/80 to $C000
       read column at $C010

       If $C05F is written, the Ctrl key is read in bit 0 of $C010 immediately afterwards.
*/
static INPUT_PORTS_START( tk2000 )
	PORT_START("ROW0")
	PORT_BIT(0x01, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_NAME("Shift")   PORT_CODE(KEYCODE_LSHIFT) PORT_CHAR(UCHAR_SHIFT_1)
	PORT_BIT(0x02, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_CODE(KEYCODE_B)  PORT_CHAR('B') PORT_CHAR('b')
	PORT_BIT(0x04, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_CODE(KEYCODE_V)  PORT_CHAR('V') PORT_CHAR('v')
	PORT_BIT(0x08, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_CODE(KEYCODE_C)  PORT_CHAR('C') PORT_CHAR('c')
	PORT_BIT(0x10, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_CODE(KEYCODE_X)  PORT_CHAR('X') PORT_CHAR('x')
	PORT_BIT(0x20, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_CODE(KEYCODE_Z)  PORT_CHAR('Z') PORT_CHAR('z')

	PORT_START("ROW1")
	PORT_BIT(0x01, IP_ACTIVE_HIGH, IPT_UNUSED)
	PORT_BIT(0x02, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_CODE(KEYCODE_G)  PORT_CHAR('G') PORT_CHAR('g')
	PORT_BIT(0x04, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_CODE(KEYCODE_F)  PORT_CHAR('F') PORT_CHAR('f')
	PORT_BIT(0x08, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_CODE(KEYCODE_D)  PORT_CHAR('D') PORT_CHAR('d')
	PORT_BIT(0x10, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_CODE(KEYCODE_S)  PORT_CHAR('S') PORT_CHAR('s')
	PORT_BIT(0x20, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_CODE(KEYCODE_A)          PORT_CHAR('A') PORT_CHAR('a')

	PORT_START("ROW2")
	PORT_BIT(0x01, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_CODE(KEYCODE_SPACE)  PORT_CHAR(' ')
	PORT_BIT(0x02, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_CODE(KEYCODE_T)  PORT_CHAR('T') PORT_CHAR('t')
	PORT_BIT(0x04, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_CODE(KEYCODE_R)  PORT_CHAR('R') PORT_CHAR('r')
	PORT_BIT(0x08, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_CODE(KEYCODE_E)  PORT_CHAR('E') PORT_CHAR('e')
	PORT_BIT(0x10, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_CODE(KEYCODE_W)  PORT_CHAR('W') PORT_CHAR('w')
	PORT_BIT(0x20, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_CODE(KEYCODE_Q)  PORT_CHAR('Q') PORT_CHAR('q')

	PORT_START("ROW3")
	PORT_BIT(0x01, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_NAME(UTF8_LEFT)      PORT_CODE(KEYCODE_LEFT)
	PORT_BIT(0x02, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_CODE(KEYCODE_5)  PORT_CHAR('5') PORT_CHAR('%')
	PORT_BIT(0x04, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_CODE(KEYCODE_4)  PORT_CHAR('4') PORT_CHAR('$')
	PORT_BIT(0x08, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_CODE(KEYCODE_3)  PORT_CHAR('3') PORT_CHAR('#')
	PORT_BIT(0x10, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_CODE(KEYCODE_2)  PORT_CHAR('2') PORT_CHAR('\"')
	PORT_BIT(0x20, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_CODE(KEYCODE_1)      PORT_CHAR('1') PORT_CHAR('!')

	PORT_START("ROW4")
	PORT_BIT(0x01, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_NAME(UTF8_RIGHT)     PORT_CODE(KEYCODE_RIGHT)
	PORT_BIT(0x02, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_CODE(KEYCODE_6)  PORT_CHAR('6') PORT_CHAR('&')
	PORT_BIT(0x04, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_CODE(KEYCODE_7)  PORT_CHAR('7') PORT_CHAR('\'')
	PORT_BIT(0x08, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_CODE(KEYCODE_8)  PORT_CHAR('8') PORT_CHAR('(')
	PORT_BIT(0x10, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_CODE(KEYCODE_9)  PORT_CHAR('9') PORT_CHAR(')')
	PORT_BIT(0x20, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_CODE(KEYCODE_0)      PORT_CHAR('0') PORT_CHAR(')')

	PORT_START("ROW5")
	PORT_BIT(0x01, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_NAME(UTF8_DOWN)      PORT_CODE(KEYCODE_DOWN)     PORT_CHAR(10)
	PORT_BIT(0x02, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_CODE(KEYCODE_Y)  PORT_CHAR('Y') PORT_CHAR('y')
	PORT_BIT(0x04, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_CODE(KEYCODE_U)  PORT_CHAR('U') PORT_CHAR('u')
	PORT_BIT(0x08, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_CODE(KEYCODE_I)  PORT_CHAR('I') PORT_CHAR('i')
	PORT_BIT(0x10, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_CODE(KEYCODE_O)  PORT_CHAR('O') PORT_CHAR('o')
	PORT_BIT(0x20, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_CODE(KEYCODE_P)  PORT_CHAR('P') PORT_CHAR('p')

	PORT_START("ROW6")
	PORT_BIT(0x01, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_NAME(UTF8_UP)        PORT_CODE(KEYCODE_UP)
	PORT_BIT(0x02, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_CODE(KEYCODE_H)  PORT_CHAR('H') PORT_CHAR('h')
	PORT_BIT(0x04, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_CODE(KEYCODE_J)  PORT_CHAR('J') PORT_CHAR('j')
	PORT_BIT(0x08, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_CODE(KEYCODE_K)  PORT_CHAR('K') PORT_CHAR('k')
	PORT_BIT(0x10, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_CODE(KEYCODE_L)  PORT_CHAR('L') PORT_CHAR('l')
	PORT_BIT(0x20, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_CODE(KEYCODE_COLON)      PORT_CHAR(';') PORT_CHAR(':')

	PORT_START("ROW7")
	PORT_BIT(0x01, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_NAME("Return")   PORT_CODE(KEYCODE_ENTER)    PORT_CHAR(13)
	PORT_BIT(0x02, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_CODE(KEYCODE_N)  PORT_CHAR('N') PORT_CHAR('n')
	PORT_BIT(0x04, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_CODE(KEYCODE_M)  PORT_CHAR('M') PORT_CHAR('m')
	PORT_BIT(0x08, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_CODE(KEYCODE_COMMA)  PORT_CHAR(',') PORT_CHAR('<')
	PORT_BIT(0x10, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_CODE(KEYCODE_STOP)   PORT_CHAR('.') PORT_CHAR('>')
	PORT_BIT(0x20, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_CODE(KEYCODE_SLASH)  PORT_CHAR('/') PORT_CHAR('?')

	PORT_START("keyb_special")
	PORT_BIT( 0x01, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_NAME("Control") PORT_CODE(KEYCODE_LCONTROL) PORT_CHAR(UCHAR_SHIFT_2)
	PORT_BIT( 0x02, IP_ACTIVE_HIGH, IPT_UNUSED)
	PORT_BIT( 0x04, IP_ACTIVE_HIGH, IPT_UNUSED)
	PORT_BIT( 0x08, IP_ACTIVE_HIGH, IPT_UNUSED)
	PORT_BIT( 0x10, IP_ACTIVE_HIGH, IPT_UNUSED)
	PORT_BIT( 0x20, IP_ACTIVE_HIGH, IPT_UNUSED)
	PORT_BIT( 0x40, IP_ACTIVE_HIGH, IPT_UNUSED)
	PORT_BIT( 0x80, IP_ACTIVE_HIGH, IPT_UNUSED)

	PORT_START("a2_config")
	PORT_CONFNAME(0x03, 0x00, "Composite monitor type")
	PORT_CONFSETTING(0x00, "Color")
	PORT_CONFSETTING(0x01, "B&W")
	PORT_CONFSETTING(0x02, "Green")
	PORT_CONFSETTING(0x03, "Amber")
INPUT_PORTS_END

MACHINE_CONFIG_START(tk2000_state::tk2000)
	/* basic machine hardware */
	MCFG_DEVICE_ADD(A2_CPU_TAG, M6502, 1021800)     /* close to actual CPU frequency of 1.020484 MHz */
	MCFG_DEVICE_PROGRAM_MAP(apple2_map)
	MCFG_TIMER_DRIVER_ADD_SCANLINE("scantimer", tk2000_state, apple2_interrupt, "screen", 0, 1)
	MCFG_QUANTUM_TIME(attotime::from_hz(60))

	MCFG_DEVICE_ADD(A2_VIDEO_TAG, APPLE2_VIDEO, XTAL(14'318'181))

	MCFG_SCREEN_ADD("screen", RASTER)
	MCFG_SCREEN_REFRESH_RATE(60)
	MCFG_SCREEN_VBLANK_TIME(ATTOSECONDS_IN_USEC(2500)) /* not accurate */
	MCFG_SCREEN_SIZE(280*2, 262)
	MCFG_SCREEN_VISIBLE_AREA(0, (280*2)-1,0,192-1)
	MCFG_SCREEN_UPDATE_DRIVER(tk2000_state, screen_update)
	MCFG_SCREEN_PALETTE("palette")

	MCFG_PALETTE_ADD("palette", 16)
	MCFG_PALETTE_INIT_OWNER(tk2000_state, tk2000)

	/* sound hardware */
	SPEAKER(config, "mono").front_center();
	MCFG_DEVICE_ADD(A2_SPEAKER_TAG, SPEAKER_SOUND)
	MCFG_SOUND_ROUTE(ALL_OUTPUTS, "mono", 1.00)

	/* /INH banking */
	MCFG_DEVICE_ADD(A2_UPPERBANK_TAG, ADDRESS_MAP_BANK, 0)
	MCFG_DEVICE_PROGRAM_MAP(inhbank_map)
	MCFG_ADDRESS_MAP_BANK_ENDIANNESS(ENDIANNESS_LITTLE)
	MCFG_ADDRESS_MAP_BANK_DATA_WIDTH(8)
	MCFG_ADDRESS_MAP_BANK_STRIDE(0x4000)

	MCFG_RAM_ADD(RAM_TAG)
	MCFG_RAM_DEFAULT_SIZE("64K")

	MCFG_CASSETTE_ADD(A2_CASSETTE_TAG)
	MCFG_CASSETTE_DEFAULT_STATE(CASSETTE_STOPPED)
MACHINE_CONFIG_END

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

  Game driver(s)

***************************************************************************/
ROM_START(tk2000)
	ROM_REGION(0x4000,"maincpu",0)
	ROM_LOAD( "tk2000.rom",   0x000000, 0x004000, CRC(dfdbacc3) SHA1(bb37844c31616046630868a4399ee3d55d6df277) )
ROM_END

/*    YEAR  NAME    PARENT  COMPAT  MACHINE  INPUT   CLASS         INIT        COMPANY         FULLNAME */
COMP( 1984, tk2000, 0,      0,      tk2000,  tk2000, tk2000_state, empty_init, "Microdigital", "TK2000", MACHINE_NOT_WORKING )