summaryrefslogtreecommitdiffstatshomepage
path: root/src/mame/drivers/schick.cpp
blob: 44cc7e1ac682c6f979f8049eae3773afbe2fecdb (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
// license:BSD-3-Clause
// copyright-holders:David Haywood, Nicola Salmoria

/* a strange hack of Pengo, seems to be built on top of the 'Penta' bootleg
   it recycles encryption from there + adds an additional layer of encryption
   has 4bpp tils instead of 2bpp, bombjack sound system
   and possibly extra protection (conditional jumps to areas where there is no ROM data)
   colours from undumped? proms (doesn't seem to be a palette RAM even with the extended 4bpp tiles)

   the changes are extensive enough to keep it here in its own driver
*/

#include "emu.h"

#include "cpu/z80/z80.h"
#include "machine/74259.h"
#include "machine/gen_latch.h"
#include "machine/watchdog.h"
#include "sound/ay8910.h"
#include "emupal.h"
#include "tilemap.h"
#include "screen.h"
#include "speaker.h"
#include "video/resnet.h"


class schick_state : public driver_device
{
public:
	schick_state(const machine_config &mconfig, device_type type, const char *tag) :
		driver_device(mconfig, type, tag),
		m_maincpu(*this, "maincpu"),
		m_decrypted_opcodes(*this, "decrypted_opcodes"),
		m_latch(*this, "latch"),
		m_watchdog(*this, "watchdog"),
		m_spriteram(*this, "spriteram"),
		m_spriteram2(*this, "spriteram2"),
		m_videoram(*this, "videoram"),
		m_colorram(*this, "colorram"),
		m_gfxdecode(*this, "gfxdecode"),
		m_palette(*this, "palette"),
		m_irq_mask(0)
	{}

	void schick(machine_config &config);

	void init_schick();

private:
	DECLARE_WRITE_LINE_MEMBER(coin_counter_1_w);
	DECLARE_WRITE_LINE_MEMBER(coin_counter_2_w);
	DECLARE_WRITE_LINE_MEMBER(irq_mask_w);
	DECLARE_WRITE_LINE_MEMBER(vblank_irq);

	DECLARE_WRITE_LINE_MEMBER(schick_palettebank_w);
	DECLARE_WRITE_LINE_MEMBER(schick_colortablebank_w);
	DECLARE_WRITE_LINE_MEMBER(schick_gfxbank_w);

	TILEMAP_MAPPER_MEMBER(schick_scan_rows);
	TILE_GET_INFO_MEMBER(schick_get_tile_info);

	void decode_penta(int end, int nodecend);
	void decode_schick_extra(int size, uint8_t* rom);

	void schick_videoram_w(offs_t offset, uint8_t data);
	void schick_colorram_w(offs_t offset, uint8_t data);

	required_device<cpu_device> m_maincpu;
	optional_shared_ptr<uint8_t> m_decrypted_opcodes;
	optional_device<ls259_device> m_latch;
	required_device<watchdog_timer_device> m_watchdog;
	optional_shared_ptr<uint8_t> m_spriteram;
	optional_shared_ptr<uint8_t> m_spriteram2;
	required_shared_ptr<uint8_t> m_videoram;
	optional_shared_ptr<uint8_t> m_colorram;
	required_device<gfxdecode_device> m_gfxdecode;
	required_device<palette_device> m_palette;

	void schick_portmap(address_map &map);
	void schick_decrypted_opcodes_map(address_map &map);
	void schick_map(address_map &map);
	void schick_audio_map(address_map &map);
	void schick_audio_io_map(address_map &map);

	uint8_t m_irq_mask;
	uint32_t screen_update_schick(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect);
	DECLARE_VIDEO_START(schick);

	tilemap_t *m_bg_tilemap;
	uint8_t m_charbank;
	uint8_t m_spritebank;
	uint8_t m_palettebank;
	uint8_t m_colortablebank;
	uint8_t m_flipscreen;
	uint8_t m_bgpriority;
	uint8_t m_inv_spr;

	uint8_t schick_hack_r()
	{
		return 0xff;
	}

};

#define MASTER_CLOCK        (18432000)

#define PIXEL_CLOCK         (MASTER_CLOCK/3)

// H counts from 128->511, HBLANK starts at 128+16=144 and ends at 128+64+32+16=240
#define HTOTAL              (384)
#define HBEND               (0)     /*(96+16)*/
#define HBSTART             (288)   /*(16)*/

#define VTOTAL              (264)
#define VBEND               (0)     /*(16)*/
#define VBSTART             (224)   /*(224+16)*/


VIDEO_START_MEMBER(schick_state,schick)
{
	save_item(NAME(m_charbank));
	save_item(NAME(m_spritebank));
	save_item(NAME(m_palettebank));
	save_item(NAME(m_colortablebank));
	save_item(NAME(m_flipscreen));
	save_item(NAME(m_bgpriority));

	m_charbank = 0;
	m_spritebank = 0;
	m_palettebank = 0;
	m_colortablebank = 0;
	m_flipscreen = 0;
	m_bgpriority = 0;
	m_inv_spr = 0;

	m_bg_tilemap = &machine().tilemap().create(*m_gfxdecode, tilemap_get_info_delegate(*this, FUNC(schick_state::schick_get_tile_info)), tilemap_mapper_delegate(*this, FUNC(schick_state::schick_scan_rows)), 8, 8, 36, 28);
}

TILEMAP_MAPPER_MEMBER(schick_state::schick_scan_rows)
{
	int offs;

	row += 2;
	col -= 2;
	if (col & 0x20)
		offs = row + ((col & 0x1f) << 5);
	else
		offs = col + (row << 5);

	return offs;
}

TILE_GET_INFO_MEMBER(schick_state::schick_get_tile_info)
{
	int code = m_videoram[tile_index] | (m_charbank << 8);
	int attr = (m_colorram[tile_index] & 0x1f) | (m_colortablebank << 5) | (m_palettebank << 6 );

	attr &= 0xf;

	tileinfo.set(0,code,attr,0);
}

void schick_state::schick_videoram_w(offs_t offset, uint8_t data)
{
	m_videoram[offset] = data;
	m_bg_tilemap->mark_tile_dirty(offset );
}

void schick_state::schick_colorram_w(offs_t offset, uint8_t data)
{
	m_colorram[offset] = data;
	m_bg_tilemap->mark_tile_dirty(offset );
}

WRITE_LINE_MEMBER(schick_state::schick_palettebank_w)
{
	m_palettebank = state;
	m_bg_tilemap->mark_all_dirty();
}

WRITE_LINE_MEMBER(schick_state::schick_colortablebank_w)
{
	m_colortablebank = state;
	m_bg_tilemap->mark_all_dirty();
}

WRITE_LINE_MEMBER(schick_state::schick_gfxbank_w)
{
	m_spritebank = state;
	m_charbank = state;
	m_bg_tilemap->mark_all_dirty();
}

WRITE_LINE_MEMBER(schick_state::coin_counter_1_w)
{
	machine().bookkeeping().coin_counter_w(0, state);
}

WRITE_LINE_MEMBER(schick_state::coin_counter_2_w)
{
	machine().bookkeeping().coin_counter_w(1, state);
}

WRITE_LINE_MEMBER(schick_state::irq_mask_w)
{
	m_irq_mask = state;
}

uint32_t schick_state::screen_update_schick(screen_device& screen, bitmap_ind16& bitmap, const rectangle& cliprect)
{
	if (m_bgpriority != 0)
		bitmap.fill(0, cliprect);
	else
		m_bg_tilemap->draw(screen, bitmap, cliprect, TILEMAP_DRAW_OPAQUE, 0);

	if (m_spriteram != nullptr)
	{
		uint8_t* spriteram = m_spriteram;
		uint8_t* spriteram_2 = m_spriteram2;
		int offs;

		rectangle spriteclip(2 * 8, 34 * 8 - 1, 0 * 8, 28 * 8 - 1);
		spriteclip &= cliprect;

		// Draw the sprites. Note that it is important to draw them exactly in this order, to have the correct priorities.
		for (offs = m_spriteram.bytes() - 2; offs >= 0; offs -= 2)
		{
			int color;
			int sx, sy;
			uint8_t fx, fy;

			if (m_inv_spr)
			{
				sx = spriteram_2[offs + 1];
				sy = 240 - (spriteram_2[offs]);
			}
			else
			{
				sx = 272 - spriteram_2[offs + 1];
				sy = spriteram_2[offs] - 31;
			}

			fx = (spriteram[offs] & 1) ^ m_inv_spr;
			fy = (spriteram[offs] & 2) ^ ((m_inv_spr) << 1);

			color = (spriteram[offs + 1] & 0x1f) | (m_colortablebank << 5) | (m_palettebank << 6);

			m_gfxdecode->gfx(1)->transpen(bitmap, spriteclip,
				(spriteram[offs] >> 2) | (m_spritebank << 6),
				color,
				fx, fy,
				sx, sy,
				0);

			m_gfxdecode->gfx(1)->transpen(bitmap, spriteclip,
				(spriteram[offs] >> 2) | (m_spritebank << 6),
				color,
				fx, fy,
				sx - 256, sy,
				0);
		}
	}

	if (m_bgpriority != 0)
		m_bg_tilemap->draw(screen, bitmap, cliprect, 0, 0);

	return 0;
}

void schick_state::schick_portmap(address_map &map)
{
	map.global_mask(0xff);
}

void schick_state::schick_map(address_map &map) // where's the sound latch?
{
	map(0x0000, 0x7fff).rom();
	map(0x8000, 0x83ff).ram().w(FUNC(schick_state::schick_videoram_w)).share("videoram");
	map(0x8400, 0x87ff).ram().w(FUNC(schick_state::schick_colorram_w)).share("colorram");
	map(0x8800, 0x8fef).ram().share("mainram");
	map(0x8ff0, 0x8fff).ram().share("spriteram");

	map(0x8923, 0x8924).r(FUNC(schick_state::schick_hack_r)); // protection? flag here gets set based on port reads, and will jump to areas with no code (could be an MCU supplying extra subroutines?)

	map(0x9000, 0x901f).nopw(); // leftover from pengo?
	map(0x9020, 0x902f).writeonly().share("spriteram2");
	map(0x9000, 0x903f).portr("SW2");
	map(0x9040, 0x907f).portr("SW1");
	map(0x9040, 0x9047).w(m_latch, FUNC(ls259_device::write_d0));
	map(0x9070, 0x9070).w(m_watchdog, FUNC(watchdog_timer_device::reset_w));
	map(0x9080, 0x90bf).portr("IN1");
	map(0x90c0, 0x90ff).portr("IN0");
	map(0xe000, 0xffff).rom();
}

void schick_state::schick_decrypted_opcodes_map(address_map &map)
{
	map(0x0000, 0xffff).rom().share("decrypted_opcodes");
	map(0x8800, 0x8fef).ram().share("mainram");
	map(0x8ff0, 0x8fff).ram().share("spriteram");
}

void schick_state::schick_audio_map(address_map &map)
{
	map(0x0000, 0x1fff).rom();
	map(0x4000, 0x43ff).ram();
	map(0x6000, 0x6000).r("soundlatch", FUNC(generic_latch_8_device::read));
}

void schick_state::schick_audio_io_map(address_map &map)
{
	map.global_mask(0xff);
	map(0x00, 0x01).w("ay1", FUNC(ay8910_device::address_data_w));
	map(0x10, 0x11).w("ay2", FUNC(ay8910_device::address_data_w));
	map(0x80, 0x81).w("ay3", FUNC(ay8910_device::address_data_w));
}

static INPUT_PORTS_START( schick ) // TODO: check everything
	PORT_START("IN0")
	PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_JOYSTICK_UP ) PORT_4WAY
	PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_JOYSTICK_DOWN ) PORT_4WAY
	PORT_BIT( 0x04, IP_ACTIVE_LOW, IPT_JOYSTICK_LEFT ) PORT_4WAY
	PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_JOYSTICK_RIGHT ) PORT_4WAY
	PORT_BIT( 0x10, IP_ACTIVE_LOW, IPT_COIN1 )
	PORT_BIT( 0x20, IP_ACTIVE_LOW, IPT_COIN2 )
	PORT_BIT( 0x40, IP_ACTIVE_LOW, IPT_COIN3 )
	PORT_BIT( 0x80, IP_ACTIVE_LOW, IPT_BUTTON1 )

	PORT_START("IN1")
	PORT_BIT( 0x01, IP_ACTIVE_LOW, IPT_JOYSTICK_UP ) PORT_4WAY PORT_COCKTAIL
	PORT_BIT( 0x02, IP_ACTIVE_LOW, IPT_JOYSTICK_DOWN ) PORT_4WAY PORT_COCKTAIL
	PORT_BIT( 0x04, IP_ACTIVE_LOW, IPT_JOYSTICK_LEFT ) PORT_4WAY PORT_COCKTAIL
	PORT_BIT( 0x08, IP_ACTIVE_LOW, IPT_JOYSTICK_RIGHT ) PORT_4WAY PORT_COCKTAIL
	PORT_SERVICE_NO_TOGGLE(0x10, IP_ACTIVE_LOW)
	PORT_BIT( 0x20, IP_ACTIVE_LOW, IPT_START1 )
	PORT_BIT( 0x40, IP_ACTIVE_LOW, IPT_START2 )
	PORT_BIT( 0x80, IP_ACTIVE_LOW, IPT_BUTTON1 ) PORT_COCKTAIL

	PORT_START("SW1")
	PORT_DIPUNKNOWN_DIPLOC(0x01, 0x01, "SW1:1")
	PORT_DIPUNKNOWN_DIPLOC(0x02, 0x02, "SW1:2")
	PORT_DIPUNKNOWN_DIPLOC(0x04, 0x04, "SW1:3")
	PORT_DIPUNKNOWN_DIPLOC(0x08, 0x08, "SW1:4")
	PORT_DIPUNKNOWN_DIPLOC(0x10, 0x10, "SW1:5")
	PORT_DIPUNKNOWN_DIPLOC(0x20, 0x20, "SW1:6")
	PORT_DIPUNKNOWN_DIPLOC(0x40, 0x40, "SW1:7")
	PORT_DIPUNKNOWN_DIPLOC(0x80, 0x80, "SW1:8")

	PORT_START("SW2")
	PORT_DIPUNKNOWN_DIPLOC(0x01, 0x01, "SW2:1")
	PORT_DIPUNKNOWN_DIPLOC(0x02, 0x02, "SW2:2")
	PORT_DIPUNKNOWN_DIPLOC(0x04, 0x04, "SW2:3")
	PORT_DIPUNKNOWN_DIPLOC(0x08, 0x08, "SW2:4")
	PORT_DIPUNKNOWN_DIPLOC(0x10, 0x10, "SW2:5")
	PORT_DIPUNKNOWN_DIPLOC(0x20, 0x20, "SW2:6")
	PORT_DIPUNKNOWN_DIPLOC(0x40, 0x40, "SW2:7")
	PORT_DIPUNKNOWN_DIPLOC(0x80, 0x80, "SW2:8")
INPUT_PORTS_END


static const gfx_layout tilelayout =
{
	8,8,
	RGN_FRAC(1,2),
	4,
	{ 0, 4, RGN_FRAC(1,2)+0, RGN_FRAC(1,2)+4 },
	{ 8*8+0, 8*8+1, 8*8+2, 8*8+3, 0, 1, 2, 3 },
	{ 0*8, 1*8, 2*8, 3*8, 4*8, 5*8, 6*8, 7*8 },
	16*8
};

static const gfx_layout spritelayout =
{
	16,16,
	RGN_FRAC(1,2),
	4,
	{ 0, 4, RGN_FRAC(1,2)+0, RGN_FRAC(1,2)+4 },
	{ 8*8, 8*8+1, 8*8+2, 8*8+3, 16*8+0, 16*8+1, 16*8+2, 16*8+3,
			24*8+0, 24*8+1, 24*8+2, 24*8+3, 0, 1, 2, 3 },
	{ 0*8, 1*8, 2*8, 3*8, 4*8, 5*8, 6*8, 7*8,
			32*8, 33*8, 34*8, 35*8, 36*8, 37*8, 38*8, 39*8 },
	64*8
};


static GFXDECODE_START( gfx_schick )
	GFXDECODE_ENTRY( "gfx1", 0x0000, tilelayout,   0, 128/4 )
	GFXDECODE_ENTRY( "gfx1", 0x0000, spritelayout, 0, 128/4 )
GFXDECODE_END

WRITE_LINE_MEMBER(schick_state::vblank_irq)
{
	if (state && m_irq_mask)
		m_maincpu->set_input_line(0, HOLD_LINE);
}

void schick_state::schick(machine_config &config) // all dividers unknown
{
	/* basic machine hardware */
	Z80(config, m_maincpu, MASTER_CLOCK/6);
	m_maincpu->set_addrmap(AS_PROGRAM, &schick_state::schick_map);
	m_maincpu->set_addrmap(AS_OPCODES, &schick_state::schick_decrypted_opcodes_map);
	m_maincpu->set_addrmap(AS_IO, &schick_state::schick_portmap);

	z80_device &audiocpu(Z80(config, "audiocpu", MASTER_CLOCK/6));
	audiocpu.set_addrmap(AS_PROGRAM, &schick_state::schick_audio_map);
	audiocpu.set_addrmap(AS_IO, &schick_state::schick_audio_io_map);

	GENERIC_LATCH_8(config, "soundlatch");

	WATCHDOG_TIMER(config, m_watchdog);

	LS259(config, m_latch); // 3I, TODO: identify bits' function. 0 is correct, 2, 6 and 7 seem to be set when switching from title screen to game screen, 1, 3, 4 and 5 seem to never be set during gameplay
	m_latch->q_out_cb<0>().set(FUNC(schick_state::irq_mask_w));
	m_latch->q_out_cb<1>().set_log("m_latch bit 1 set");
	m_latch->q_out_cb<2>().set(FUNC(schick_state::schick_palettebank_w));
	m_latch->q_out_cb<3>().set_log("m_latch bit 3 set");
	m_latch->q_out_cb<4>().set_log("m_latch bit 4 set");
	m_latch->q_out_cb<5>().set_log("m_latch bit 5 set");
	m_latch->q_out_cb<6>().set(FUNC(schick_state::schick_colortablebank_w));
	m_latch->q_out_cb<7>().set(FUNC(schick_state::schick_gfxbank_w));

	/* video hardware */
	GFXDECODE(config, m_gfxdecode, m_palette, gfx_schick);
	PALETTE(config, "palette").set_format(palette_device::xRGB_555, 0x8000); // unknown format, from missing PROMs?

	screen_device &screen(SCREEN(config, "screen", SCREEN_TYPE_RASTER)); // to be verified
	screen.set_raw(PIXEL_CLOCK, HTOTAL, HBEND, HBSTART, VTOTAL, VBEND, VBSTART);
	screen.set_screen_update(FUNC(schick_state::screen_update_schick));
	screen.set_palette(m_palette);
	screen.screen_vblank().set(FUNC(schick_state::vblank_irq));

	MCFG_VIDEO_START_OVERRIDE(schick_state, schick)

	// sound hardware
	SPEAKER(config, "mono").front_center();

	AY8910(config, "ay1", MASTER_CLOCK/12).add_route(ALL_OUTPUTS, "mono", 0.13);

	AY8910(config, "ay2", MASTER_CLOCK/12).add_route(ALL_OUTPUTS, "mono", 0.13);

	AY8910(config, "ay3", MASTER_CLOCK/12).add_route(ALL_OUTPUTS, "mono", 0.13);
}



// copied from schick.cpp, as also used here
void schick_state::decode_penta(int end, int nodecend)
{
/*
    the values vary, but the translation mask is always laid out like this:

      0 1 2 3 4 5 6 7 8 9 a b c d e f
    0 A A B B A A B B C C D D C C D D
    1 A A B B A A B B C C D D C C D D
    2 E E F F E E F F G G H H G G H H
    3 E E F F E E F F G G H H G G H H
    4 A A B B A A B B C C D D C C D D
    5 A A B B A A B B C C D D C C D D
    6 E E F F E E F F G G H H G G H H
    7 E E F F E E F F G G H H G G H H
    8 H H G G H H G G F F E E F F E E
    9 H H G G H H G G F F E E F F E E
    a D D C C D D C C B B A A B B A A
    b D D C C D D C C B B A A B B A A
    c H H G G H H G G F F E E F F E E
    d H H G G H H G G F F E E F F E E
    e D D C C D D C C B B A A B B A A
    f D D C C D D C C B B A A B B A A

    (e.g. 0xc0 is XORed with H)
    therefore in the following tables we only keep track of A, B, C, D, E, F, G and H.
*/
	static const uint8_t data_xortable[2][8] =
	{
		{ 0xa0,0x82,0x28,0x0a,0x82,0xa0,0x0a,0x28 },    // ...............0
		{ 0x88,0x0a,0x82,0x00,0x88,0x0a,0x82,0x00 }     // ...............1
	};
	static const uint8_t opcode_xortable[8][8] =
	{
		{ 0x02,0x08,0x2a,0x20,0x20,0x2a,0x08,0x02 },    // ...0...0...0....
		{ 0x88,0x88,0x00,0x00,0x88,0x88,0x00,0x00 },    // ...0...0...1....
		{ 0x88,0x0a,0x82,0x00,0xa0,0x22,0xaa,0x28 },    // ...0...1...0....
		{ 0x88,0x0a,0x82,0x00,0xa0,0x22,0xaa,0x28 },    // ...0...1...1....
		{ 0x2a,0x08,0x2a,0x08,0x8a,0xa8,0x8a,0xa8 },    // ...1...0...0....
		{ 0x2a,0x08,0x2a,0x08,0x8a,0xa8,0x8a,0xa8 },    // ...1...0...1....
		{ 0x88,0x0a,0x82,0x00,0xa0,0x22,0xaa,0x28 },    // ...1...1...0....
		{ 0x88,0x0a,0x82,0x00,0xa0,0x22,0xaa,0x28 }     // ...1...1...1....
	};

	uint8_t *rom = memregion("maincpu")->base();

	for (int A = 0x0000;A < end;A++)
	{
		uint8_t src = rom[A];

		// pick the translation table from bit 0 of the address
		int i = A & 1;

		// pick the offset in the table from bits 1, 3 and 5 of the source data
		int j = ((src >> 1) & 1) + (((src >> 3) & 1) << 1) + (((src >> 5) & 1) << 2);
		// the bottom half of the translation table is the mirror image of the top
		if (src & 0x80) j = 7 - j;

		// decode the ROM data
		rom[A] = src ^ data_xortable[i][j];

		// now decode the opcodes
		// pick the translation table from bits 4, 8 and 12 of the address
		i = ((A >> 4) & 1) + (((A >> 8) & 1) << 1) + (((A >> 12) & 1) << 2);
		m_decrypted_opcodes[A] = src ^ opcode_xortable[i][j];
	}

	for (int A = end; A < nodecend; A++)
	{
		m_decrypted_opcodes[A] = rom[A];
	}
}

void schick_state::decode_schick_extra(int size, uint8_t* rom)
{
	// schick has an extra layer of encryption in addition to the penta encryption
	for (int A = 0x0000; A < 0x8000; A++)
	{
		uint8_t srcdec = rom[A];

		if (A & 0x100)
		{
			srcdec = bitswap<8>(srcdec^0x41, 7, 4, 5, 6, 3, 2, 1, 0);
		}
		else
		{
			srcdec = bitswap<8>(srcdec^0x51, 7, 6, 5, 0, 3, 2, 1, 4);
		}


		rom[A] = srcdec;
	}

	for (int A = 0x8000; A < 0x10000; A++) // TODO: decryption is presumed correct, but ROM test fails (because it's a hack or because of some decryption errors lingering?)
	{
		uint8_t srcdec = rom[A];

		// this layer of encryption only affects bits 0,4,6

		if (rom == m_decrypted_opcodes)
		{
			if (A & 0x1000)
			{
				srcdec = bitswap<8>(srcdec ^ 0x40, 7, 0, 5, 6, 3, 2, 1, 4);
				rom[A] = srcdec;
			}
			else
			{
				if  (A & 0x100)
				{
					srcdec = bitswap<8>(srcdec ^ 0x40, 7, 4, 5, 0, 3, 2, 1, 6);
					rom[A] = srcdec;
				}
				else
				{
					srcdec = bitswap<8>(srcdec ^ 0x41, 7, 0, 5, 6, 3, 2, 1, 4);
					rom[A] = srcdec;
				}
			}
		}
		else
		{
			if (A & 0x10)
				srcdec = bitswap<8>(srcdec ^ 0x11, 7, 0, 5, 6, 3, 2, 1, 4);
			else
				srcdec = bitswap<8>(srcdec ^ 0x51, 7, 4, 5, 0, 3, 2, 1, 6);

			rom[A] = srcdec;
		}
	}
}

void schick_state::init_schick()
{
	uint8_t *rom = memregion("maincpu")->base();

	decode_penta(0x8000, 0x10000);

	decode_schick_extra(0x10000, rom);
	decode_schick_extra(0x10000, m_decrypted_opcodes);
}


// MH032288 PCB. LC ('lato componenti', components side in Italian) so maybe produced in Italy?
// A plastic block in a corner covers probably the main CPU and the decryption logic.
ROM_START( schick )
	ROM_REGION( 0x10000, "maincpu", 0 )
	ROM_LOAD( "27c512.8d", 0x0000, 0x10000, CRC(38986329) SHA1(bfd62d6a49d25acc582e5f076833c3b22c1a7fd7) )

	ROM_REGION( 0x8000, "audiocpu", 0 )
	ROM_LOAD( "27c256.7m", 0x0000, 0x8000, CRC(694dadca) SHA1(65d436d6c8ebf6a9b5af286122e7391973d463e0) ) // identical to bombjack, but 4x

	ROM_REGION( 0x10000, "gfx1", 0 )
	ROM_LOAD( "4.27c256.4f",  0x0000, 0x8000, CRC(f666a52a) SHA1(877e1112c9c9a39b55934f6a382ad35fc9bf6859) ) // only labeled ROM
	ROM_LOAD( "27c256.4e",    0x8000, 0x8000, CRC(edb4a243) SHA1(64f35b5142ffb3bfbd6a2899af9d1d719b83e2a1) )

	ROM_REGION( 0x420, "proms", ROMREGION_ERASEFF ) // color palette
	ROM_LOAD( "63s081n",   0x000, 0x020, NO_DUMP)
	ROM_LOAD( "am27s33pc", 0x020, 0x400, NO_DUMP)
ROM_END


GAME( 1988, schick, 0, schick, schick, schick_state, init_schick, ROT90, "Microhard", "Super Chick", MACHINE_NOT_WORKING | MACHINE_NO_SOUND | MACHINE_UNEMULATED_PROTECTION | MACHINE_SUPPORTS_SAVE )