summaryrefslogtreecommitdiffstatshomepage
path: root/src/mame/drivers/pv2000.cpp
blob: 196eaad7022c2c1765b5552adaa9dab4d009e7f8 (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
// license:BSD-3-Clause
// copyright-holders:Wilbert Pol
/*

CASIO PV-2000

(preliminary work by anondumper)
Thanks for the loaner (Ianoid)

NOTE:
The PCB has printed names of components, not ICXY, etc
but: "hn613128pc64.bin"

SEE
http://hou4gong1.mo-blog.jp/.shared/image.html?/photos/uncategorized/pv_2000_k1.jpg
http://hou4gong1.mo-blog.jp/.shared/image.html?/photos/uncategorized/pv_2000_14.jpg
http://hou4gong1.mo-blog.jp/.shared/image.html?/photos/uncategorized/pv_2000_15.jpg

Keyboard inputs are partially supported. Keys missing from the input ports:
- GAME - no beep in basic - is this really a key?

Todo:
- Add joystick support
- Cassette support

Also See:
http://www2.odn.ne.jp/~haf09260/Pv2000/EnrPV.htm
For BIOS CRC confirmation
*/


#include "emu.h"
#include "cpu/z80/z80.h"
#include "sound/sn76496.h"
#include "video/tms9928a.h"
#include "imagedev/cassette.h"
#include "bus/generic/slot.h"
#include "bus/generic/carts.h"
#include "screen.h"
#include "softlist.h"
#include "speaker.h"

class pv2000_state : public driver_device
{
public:
	pv2000_state(const machine_config &mconfig, device_type type, const char *tag) :
		driver_device(mconfig, type, tag),
		m_maincpu(*this, "maincpu"),
		m_cass(*this, "cassette"),
		m_cart(*this, "cartslot"),
		m_last_state(0)
	{ }

	void pv2000(machine_config &config);

private:
	required_device<cpu_device> m_maincpu;
	required_device<cassette_image_device> m_cass;
	required_device<generic_slot_device> m_cart;
	DECLARE_WRITE8_MEMBER(cass_conf_w);
	DECLARE_WRITE8_MEMBER(keys_w);
	DECLARE_READ8_MEMBER(keys_hi_r);
	DECLARE_READ8_MEMBER(keys_lo_r);
	DECLARE_READ8_MEMBER(keys_mod_r);
	DECLARE_WRITE_LINE_MEMBER(pv2000_vdp_interrupt);
	DECLARE_READ8_MEMBER(cass_in);
	DECLARE_WRITE8_MEMBER(cass_out);
	bool m_last_state;
	uint8_t m_key_pressed;
	uint8_t m_keyb_column;
	uint8_t m_cass_conf;
	virtual void machine_start() override;
	virtual void machine_reset() override;
	DECLARE_DEVICE_IMAGE_LOAD_MEMBER(cart_load);
	void pv2000_io_map(address_map &map);
	void pv2000_map(address_map &map);
};


WRITE8_MEMBER( pv2000_state::cass_conf_w )
{
	logerror( "%s: cass_conf_w %02x\n", machine().describe_context(), data );

	m_cass_conf = data & 0x0f;

	if ( m_cass_conf & 0x01 )
		m_cass->change_state(CASSETTE_MOTOR_ENABLED, CASSETTE_MASK_MOTOR);
	else
		m_cass->change_state(CASSETTE_MOTOR_DISABLED, CASSETTE_MASK_MOTOR);
}


WRITE8_MEMBER( pv2000_state::keys_w )
{
	logerror( "%s: keys_w %02x\n", machine().describe_context(), data );

	m_keyb_column = data & 0x0f;

	m_maincpu->set_input_line(INPUT_LINE_IRQ0, CLEAR_LINE);
}


READ8_MEMBER( pv2000_state::keys_hi_r )
{
	uint8_t data = 0;
	char kbdrow[6];

	switch ( m_keyb_column )
	{
	case 0:
	case 1:
	case 2:
	case 3:
	case 4:
	case 5:
	case 6:
	case 7:
	case 8:
		sprintf(kbdrow,"IN%d",m_keyb_column);
		data = ioport( kbdrow )->read() >> 4;
	}

	return data;
}


READ8_MEMBER( pv2000_state::keys_lo_r )
{
	uint8_t data = 0;
	char kbdrow[6];

	logerror("%s: pv2000_keys_r\n", machine().describe_context() );

	switch ( m_keyb_column )
	{
	case 0:
	case 1:
	case 2:
	case 3:
	case 4:
	case 5:
	case 6:
	case 7:
	case 8:
	case 9:
		sprintf(kbdrow,"IN%d",m_keyb_column);
		data = ioport( kbdrow )->read() & 0x0f;
	}

	return 0xf0 | data;
}


READ8_MEMBER( pv2000_state::keys_mod_r )
{
	return 0xf0 | ioport( "MOD" )->read();
}

READ8_MEMBER( pv2000_state::cass_in )
{
	// from what i can tell,
	// 0 = data in
	// 1 = must be high
	// 2 = must be low
	// bits 1 & 2 are checked while reading and writing tapes
	// Press STOP key (F1) to cancel LOAD or SAVE

	return 2 | ((m_cass->input() > +0.03) ? 1 : 0);
}

WRITE8_MEMBER( pv2000_state::cass_out )
{
	// it outputs 8-bit values here which are not the bytes in the file
	// result is not readable

	m_cass->output( BIT(data, 0) ? -1.0 : +1.0);
}


/* Memory Maps */

void pv2000_state::pv2000_map(address_map &map)
{
	map(0x0000, 0x3fff).rom();

	map(0x4000, 0x4001).rw("tms9928a", FUNC(tms9928a_device::read), FUNC(tms9928a_device::write));

	map(0x7000, 0x7fff).ram();
	//AM_RANGE(0x8000, 0xbfff) ext ram?
	//AM_RANGE(0xc000, 0xffff)      // mapped by the cartslot
}


void pv2000_state::pv2000_io_map(address_map &map)
{
	map.global_mask(0xff);

	//theres also printer and tape I/O (TODO)
	map(0x00, 0x00).w(FUNC(pv2000_state::cass_conf_w));

	//keyboard/joystick
	map(0x10, 0x10).r(FUNC(pv2000_state::keys_hi_r));
	map(0x20, 0x20).rw(FUNC(pv2000_state::keys_lo_r), FUNC(pv2000_state::keys_w));

	//sn76489a
	map(0x40, 0x40).r(FUNC(pv2000_state::keys_mod_r)).w("sn76489a", FUNC(sn76489a_device::write));

	/* Cassette input. Gets hit a lot after a GLOAD command */
	map(0x60, 0x60).rw(FUNC(pv2000_state::cass_in), FUNC(pv2000_state::cass_out));
}


static INPUT_PORTS_START( pv2000 )
	PORT_START("IN0")
	PORT_BIT( 0x01, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_CODE(KEYCODE_4) PORT_CHAR('4') PORT_CHAR('$')
	PORT_BIT( 0x02, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_CODE(KEYCODE_3) PORT_CHAR('3') PORT_CHAR('#')
	PORT_BIT( 0x04, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_CODE(KEYCODE_2) PORT_CHAR('2') PORT_CHAR('"')
	PORT_BIT( 0x08, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_CODE(KEYCODE_1) PORT_CHAR('1') PORT_CHAR('!')
	PORT_BIT( 0x10, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_CODE(KEYCODE_8) PORT_CHAR('8') PORT_CHAR('(')
	PORT_BIT( 0x20, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_CODE(KEYCODE_7) PORT_CHAR('7') PORT_CHAR('\'')
	PORT_BIT( 0x40, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_CODE(KEYCODE_6) PORT_CHAR('6') PORT_CHAR('&')
	PORT_BIT( 0x80, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_CODE(KEYCODE_5) PORT_CHAR('5') PORT_CHAR('%')

	PORT_START("IN1")
	PORT_BIT( 0x01, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_CODE(KEYCODE_R) PORT_CHAR('R') PORT_CHAR('r')
	PORT_BIT( 0x02, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_CODE(KEYCODE_E) PORT_CHAR('E') PORT_CHAR('e')
	PORT_BIT( 0x04, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_CODE(KEYCODE_W) PORT_CHAR('W') PORT_CHAR('w')
	PORT_BIT( 0x08, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_CODE(KEYCODE_Q) PORT_CHAR('Q') PORT_CHAR('q')
	PORT_BIT( 0x10, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_CODE(KEYCODE_I) PORT_CHAR('I') PORT_CHAR('i')
	PORT_BIT( 0x20, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_CODE(KEYCODE_U) PORT_CHAR('U') PORT_CHAR('u')
	PORT_BIT( 0x40, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_CODE(KEYCODE_Y) PORT_CHAR('Y') PORT_CHAR('y')
	PORT_BIT( 0x80, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_CODE(KEYCODE_T) PORT_CHAR('T') PORT_CHAR('t')

	PORT_START("IN2")
	PORT_BIT( 0x01, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_CODE(KEYCODE_F) PORT_CHAR('F') PORT_CHAR('f')
	PORT_BIT( 0x02, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_CODE(KEYCODE_D) PORT_CHAR('D') PORT_CHAR('d')
	PORT_BIT( 0x04, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_CODE(KEYCODE_S) PORT_CHAR('S') PORT_CHAR('s')
	PORT_BIT( 0x08, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_CODE(KEYCODE_A) PORT_CHAR('A') PORT_CHAR('a')
	PORT_BIT( 0x10, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_CODE(KEYCODE_K) PORT_CHAR('K') PORT_CHAR('k')
	PORT_BIT( 0x20, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_CODE(KEYCODE_J) PORT_CHAR('J') PORT_CHAR('j')
	PORT_BIT( 0x40, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_CODE(KEYCODE_H) PORT_CHAR('H') PORT_CHAR('h')
	PORT_BIT( 0x80, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_CODE(KEYCODE_G) PORT_CHAR('G') PORT_CHAR('g')

	PORT_START("IN3")
	PORT_BIT( 0x01, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_CODE(KEYCODE_C) PORT_CHAR('C') PORT_CHAR('c')
	PORT_BIT( 0x02, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_CODE(KEYCODE_X) PORT_CHAR('X') PORT_CHAR('x')
	PORT_BIT( 0x04, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_CODE(KEYCODE_Z) PORT_CHAR('Z') PORT_CHAR('z')
	PORT_BIT( 0x08, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_NAME("Hiragana")
	PORT_BIT( 0x10, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_CODE(KEYCODE_SPACE) PORT_CHAR(' ')
	PORT_BIT( 0x20, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_CODE(KEYCODE_N) PORT_CHAR('N') PORT_CHAR('n')
	PORT_BIT( 0x40, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_CODE(KEYCODE_B) PORT_CHAR('B') PORT_CHAR('b')
	PORT_BIT( 0x80, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_CODE(KEYCODE_V) PORT_CHAR('V') PORT_CHAR('v')

	PORT_START("IN4")
	PORT_BIT( 0x01, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_NAME("Yen")
	PORT_BIT( 0x02, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_NAME("IN4_1") /* Game?? DEL / MODE / STOP ??, no beep in basic, START in galaga */
	PORT_BIT( 0x04, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_NAME("IN4_2") /* DEL / MODE / STOP ??, no beep in basic, SELECT in galaga */
	PORT_BIT( 0x08, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_CODE(KEYCODE_HOME) PORT_CHAR(UCHAR_MAMEKEY(HOME))
	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_MINUS) PORT_CHAR('-') PORT_CHAR('=')
	PORT_BIT( 0x40, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_CODE(KEYCODE_EQUALS) PORT_CHAR('^') PORT_CHAR('~')
	PORT_BIT( 0x80, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_CODE(KEYCODE_0) PORT_CHAR('0')

	PORT_START("IN5")
	PORT_BIT( 0x01, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_NAME("CRSR Up+Left") PORT_CODE(KEYCODE_7_PAD)
	PORT_BIT( 0x02, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_NAME("CRSR Down+Left") PORT_CODE(KEYCODE_1_PAD)
	PORT_BIT( 0x04, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_NAME("CRSR Down+Right") PORT_CODE(KEYCODE_3_PAD)
	PORT_BIT( 0x08, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_NAME("CRSR Up+Right") PORT_CODE(KEYCODE_9_PAD)
	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_OPENBRACE) PORT_CHAR('@') PORT_CHAR('`')
	PORT_BIT( 0x40, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_CODE(KEYCODE_CLOSEBRACE) PORT_CHAR('[') PORT_CHAR('{')
	PORT_BIT( 0x80, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_CODE(KEYCODE_P) PORT_CHAR('P') PORT_CHAR('p')

	PORT_START("IN6")
	PORT_BIT( 0x01, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_CODE(KEYCODE_DOWN) PORT_CODE(KEYCODE_2_PAD) PORT_CHAR(UCHAR_MAMEKEY(DOWN))
	PORT_BIT( 0x02, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_CODE(KEYCODE_RIGHT) PORT_CODE(KEYCODE_6_PAD) PORT_CHAR(UCHAR_MAMEKEY(RIGHT))
	PORT_BIT( 0x04, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_NAME("IN6_2") /* Unknown ??, no beep in basic */
	PORT_BIT( 0x08, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_NAME("IN6_3") /* Unknown ??, no beep in basic */
	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_QUOTE) PORT_CHAR(':') PORT_CHAR('*')
	PORT_BIT( 0x40, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_CODE(KEYCODE_BACKSLASH) PORT_CHAR(']') PORT_CHAR('}')
	PORT_BIT( 0x80, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_CODE(KEYCODE_COLON) PORT_CHAR(';') PORT_CHAR('+')

	PORT_START("IN7")
	PORT_BIT( 0x01, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_CODE(KEYCODE_LEFT) PORT_CODE(KEYCODE_4_PAD) PORT_CHAR(UCHAR_MAMEKEY(LEFT))
	PORT_BIT( 0x02, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_CODE(KEYCODE_UP) PORT_CODE(KEYCODE_8_PAD) PORT_CHAR(UCHAR_MAMEKEY(UP))
	PORT_BIT( 0x04, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_NAME("IN7_2") /* Unknown ??, no beep in basic */
	PORT_BIT( 0x08, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_NAME("IN7_3") /* Unknown ??, no beep in basic */
	PORT_BIT( 0x10, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_CODE(KEYCODE_M) PORT_CHAR('M') PORT_CHAR('m')
	PORT_BIT( 0x20, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_CODE(KEYCODE_STOP) PORT_CHAR('.') PORT_CHAR('>')
	PORT_BIT( 0x40, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_CODE(KEYCODE_SLASH) PORT_CHAR('/') PORT_CHAR('?')
	PORT_BIT( 0x80, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_CODE(KEYCODE_COMMA) PORT_CHAR(',') PORT_CHAR('<')

	PORT_START("IN8")
	PORT_BIT( 0x01, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_CODE(KEYCODE_LCONTROL) PORT_NAME("Attack 0")
	PORT_BIT( 0x02, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_CODE(KEYCODE_LALT) PORT_NAME("Attack 1")
	PORT_BIT( 0x04, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_NAME("IN8_2") /* Unknown ?, no beep in basic */
	PORT_BIT( 0x08, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_NAME("IN8_3") /* Unknown ?, no beep in basic */
	PORT_BIT( 0x10, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_CODE(KEYCODE_ENTER) PORT_CHAR(13)
	PORT_BIT( 0x20, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_NAME("Mode")
	PORT_BIT( 0x40, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_NAME("Del")
	PORT_BIT( 0x80, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_NAME("IN8_7") /* Unknown ?, no beep in basic */

	PORT_START("IN9")
	PORT_BIT( 0x01, IP_ACTIVE_HIGH, IPT_UNUSED )
	PORT_BIT( 0x02, IP_ACTIVE_HIGH, IPT_UNUSED )
	PORT_BIT( 0x04, IP_ACTIVE_HIGH, IPT_UNUSED )
	PORT_BIT( 0x08, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_CODE(KEYCODE_F1) PORT_NAME("Stop")

	PORT_START("MOD")
	PORT_BIT( 0x01, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_CODE(KEYCODE_RALT) PORT_NAME("Color")
	PORT_BIT( 0x02, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_CODE(KEYCODE_TAB) PORT_NAME("Func")
	PORT_BIT( 0x04, IP_ACTIVE_HIGH, IPT_KEYBOARD ) PORT_NAME("Shift") PORT_CODE(KEYCODE_LSHIFT) PORT_CODE(KEYCODE_RSHIFT) PORT_CHAR(UCHAR_SHIFT_1)
	PORT_BIT( 0x08, IP_ACTIVE_HIGH, IPT_UNUSED )

INPUT_PORTS_END


WRITE_LINE_MEMBER( pv2000_state::pv2000_vdp_interrupt )
{
	// only if it goes up
	if (state && !m_last_state)
		m_maincpu->pulse_input_line(INPUT_LINE_NMI, attotime::zero);

	m_last_state = state;

	/* Check if irq triggering from keyboard presses is enabled */
	if ( m_keyb_column == 0x0f )
	{
		/* Check if a key is pressed */
		uint8_t key_pressed;

		key_pressed = ioport( "IN0" )->read()
			| ioport( "IN1" )->read()
			| ioport( "IN2" )->read()
			| ioport( "IN3" )->read()
			| ioport( "IN4" )->read()
			| ioport( "IN5" )->read()
			| ioport( "IN6" )->read()
			| ioport( "IN7" )->read()
			| ioport( "IN8" )->read();

		if ( key_pressed && m_key_pressed != key_pressed )
			m_maincpu->set_input_line(INPUT_LINE_IRQ0, ASSERT_LINE);

		m_key_pressed = key_pressed;
	}
}



/* Machine Initialization */

void pv2000_state::machine_start()
{
	if (m_cart->exists())
		m_maincpu->space(AS_PROGRAM).install_read_handler(0xc000, 0xffff, read8sm_delegate(FUNC(generic_slot_device::read_rom),(generic_slot_device*)m_cart));
}

void pv2000_state::machine_reset()
{
	m_last_state = 0;
	m_key_pressed = 0;
	m_keyb_column = 0;

	m_maincpu->set_input_line_vector(INPUT_LINE_IRQ0, 0xff); // Z80
	memset(&memregion("maincpu")->base()[0x7000], 0xff, 0x1000);    // initialize RAM
}

DEVICE_IMAGE_LOAD_MEMBER( pv2000_state::cart_load )
{
	uint32_t size = m_cart->common_get_size("rom");

	if (size != 0x2000 && size != 0x4000)
	{
		image.seterror(IMAGE_ERROR_UNSPECIFIED, "Unsupported cartridge size");
		return image_init_result::FAIL;
	}

	m_cart->rom_alloc(size, GENERIC_ROM8_WIDTH, ENDIANNESS_LITTLE);
	m_cart->common_load_rom(m_cart->get_rom_base(), size, "rom");

	return image_init_result::PASS;
}

/* Machine Drivers */
void pv2000_state::pv2000(machine_config &config)
{
	// basic machine hardware
	Z80(config, m_maincpu, XTAL(7'159'090)/2); // 3.579545 MHz
	m_maincpu->set_addrmap(AS_PROGRAM, &pv2000_state::pv2000_map);
	m_maincpu->set_addrmap(AS_IO, &pv2000_state::pv2000_io_map);

	// video hardware
	tms9928a_device &vdp(TMS9928A(config, "tms9928a", XTAL(10'738'635)));
	vdp.set_screen("screen");
	vdp.set_vram_size(0x4000);
	vdp.int_callback().set(FUNC(pv2000_state::pv2000_vdp_interrupt));
	SCREEN(config, "screen", SCREEN_TYPE_RASTER);

	// sound hardware
	SPEAKER(config, "mono").front_center();
	SN76489A(config, "sn76489a", XTAL(7'159'090)/2).add_route(ALL_OUTPUTS, "mono", 1.00); /* 3.579545 MHz */

	/* cassette */
	CASSETTE(config, m_cass);
	m_cass->set_default_state(CASSETTE_STOPPED | CASSETTE_MOTOR_DISABLED);
	m_cass->add_route(ALL_OUTPUTS, "mono", 0.05);

	/* cartridge */
	GENERIC_CARTSLOT(config, "cartslot", generic_plain_slot, "pv2000_cart", "bin,rom,col").set_device_load(FUNC(pv2000_state::cart_load), this);

	/* Software lists */
	SOFTWARE_LIST(config, "cart_list").set_original("pv2000");
}



/* ROMs */
ROM_START (pv2000)
	ROM_REGION( 0x10000, "maincpu", 0 )
	ROM_LOAD( "hn613128pc64.bin", 0x0000, 0x4000, CRC(8f31f297) SHA1(94b5f54dd7bce321e377fdaaf592acd3870cf621) )
ROM_END


/* System Drivers */

//    YEAR  NAME    PARENT  COMPAT  MACHINE  INPUT   CLASS         INIT        COMPANY   FULLNAME    FLAGS
CONS( 1983, pv2000, 0,      0,      pv2000,  pv2000, pv2000_state, empty_init, "Casio",  "PV-2000",  MACHINE_NOT_WORKING )