summaryrefslogtreecommitdiffstatshomepage
path: root/src/mess/drivers/bcs3.c
blob: 8292aedd270efb0b0a9e32907b397228aee52596 (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
// license:BSD-3-Clause
// copyright-holders:Robbbert
/***************************************************************************

        BCS 3

    2009-05-12 Skeleton driver.
    2015-09-25 Improvements

    http://hc-ddr.hucki.net/wiki/doku.php/homecomputer:bcs3

    East German home built computer. No sound facilities.
    All documents are in German.

    Main CPU is a U880 (Z80 equivalent). Other ICs also have unusual names.

    The CTC sends an interrupt every so often. This uses a lookup table to
    jump to an address in the range 38xx-39xx. This seems to work much the
    same as reading video memory in the ZX80. This, I think, is to stop snow
    appearing on the screen. It also slows everything down noticeably.

    It appears that a read of 1400 activates the Z80's /WAIT pin. This will
    be released by a VS pulse. (Not emulated)

    Cassette is hooked up according to the documentation, but it doesn't work.

    Known Memory Map:
    0000 - 0FFF: Main ROM
    1000 - 13FF: Keyboard
    1400 - 17FF: /WAIT circuit
    1800 - 1BFF: Output one character's scanline to the monitor. ZX-video process.
    1C00 - 1FFF: Video RAM
    2000 - 3FFF: Mirror of 0000 - 1FFF.
    4000 - up  : Extra RAM (required for hack versions)

    Hack versions:
    - They are fitted with Basic 3.x, require more RAM, and use hardware scrolling.
    - No schematic has been found, so the code is educated guesswork.
    - The ZX process is still to be worked out. For now, we return 0xF7 to finish.
    - There is a machine-language monitor fitted to some models. To access:
    -- Y = USR(0F000H)
    -- Commands are S (substitute), M (move), T (test), G (go), Q (quit)

    To Do:
    - Need software
    - Fix cassette
    - Hack versions: fix the ZX process

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

#include "emu.h"
#include "cpu/z80/z80.h"
#include "cpu/z80/z80daisy.h"
#include "machine/z80ctc.h"
#include "imagedev/cassette.h"


class bcs3_state : public driver_device
{
public:
	bcs3_state(const machine_config &mconfig, device_type type, const char *tag)
		: driver_device(mconfig, type, tag)
		, m_maincpu(*this, "maincpu")
		, m_ctc(*this, "ctc")
		, m_p_chargen(*this, "chargen")
		, m_p_videoram(*this, "videoram")
		, m_cass(*this, "cassette")
		, m_io_keyboard(*this, "KEY")
	{ }

	DECLARE_READ8_MEMBER(keyboard_r);
	DECLARE_READ8_MEMBER(video_r);
	DECLARE_READ8_MEMBER(zx_r);
	DECLARE_WRITE_LINE_MEMBER(ctc_z0_w);
	DECLARE_WRITE_LINE_MEMBER(ctc_z1_w);
	DECLARE_DRIVER_INIT(bcs3a);
	DECLARE_DRIVER_INIT(bcs3b);
	DECLARE_DRIVER_INIT(bcs3c);
	DECLARE_DRIVER_INIT(bcs3d);
	UINT32 screen_update_bcs3(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect);
	UINT32 screen_update_bcs3a(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect);

private:
	bool m_cass_bit;
	UINT8 s_curs;
	UINT8 s_init;
	UINT8 s_rows;
	UINT8 s_cols;

	required_device<cpu_device> m_maincpu;
	required_device<z80ctc_device> m_ctc;
	required_memory_region m_p_chargen;
	required_shared_ptr<UINT8> m_p_videoram;
	required_device<cassette_image_device> m_cass;
	required_ioport_array<10> m_io_keyboard;
};

READ8_MEMBER( bcs3_state::keyboard_r )
{
	UINT8 i, data = 0;

	if (offset == 0)
		data = (m_cass->input() > +0.01) ? 0x80 : 0;

	offset ^= 0x3ff;

	for (i = 0; i < 10; i++)
		if BIT(offset, i)
			data |= m_io_keyboard[i]->read();

	return data;
}

// 00-7F = NUL, 0xE0 = end of line.
READ8_MEMBER( bcs3_state::video_r )
{
	UINT8 data = m_p_videoram[offset];
	return BIT(data, 7) ? data : 0;
}

// Unsure of how this works.
// 00-7F = NUL, 0xFF = end of line, 0xF7 = finish.
READ8_MEMBER( bcs3_state::zx_r )
{
	return 0xf7;
}

static ADDRESS_MAP_START(bcs3_mem, AS_PROGRAM, 8, bcs3_state)
	ADDRESS_MAP_UNMAP_HIGH
	AM_RANGE( 0x0000, 0x0fff ) AM_MIRROR(0x2000) AM_ROM AM_REGION("roms", 0)
	AM_RANGE( 0x1000, 0x13ff ) AM_MIRROR(0x2000) AM_READ(keyboard_r)
	AM_RANGE( 0x1400, 0x17ff ) AM_MIRROR(0x2000) AM_NOP //  /WAIT circuit
	AM_RANGE( 0x1800, 0x1bff ) AM_MIRROR(0x2000) AM_READ(video_r)
	AM_RANGE( 0x1c00, 0x1fff ) AM_MIRROR(0x2000) AM_RAM AM_SHARE("videoram")
ADDRESS_MAP_END

static ADDRESS_MAP_START(bcs3a_mem, AS_PROGRAM, 8, bcs3_state)
	ADDRESS_MAP_UNMAP_HIGH
	AM_RANGE( 0x0000, 0x0fff ) AM_MIRROR(0x2000) AM_ROM AM_REGION("roms", 0)
	AM_RANGE( 0x1000, 0x13ff ) AM_MIRROR(0x2000) AM_READ(keyboard_r)
	AM_RANGE( 0x1400, 0x17ff ) AM_MIRROR(0x2000) AM_NOP //  /WAIT circuit
	AM_RANGE( 0x1800, 0x1bff ) AM_MIRROR(0x2000) AM_READ(zx_r)
	AM_RANGE( 0x3c00, 0x7fff ) AM_RAM AM_SHARE("videoram")
	AM_RANGE( 0xf000, 0xf3ff ) AM_ROM AM_REGION("roms", 0x1000)
ADDRESS_MAP_END

static ADDRESS_MAP_START( bcs3_io, AS_IO, 8, bcs3_state)
	ADDRESS_MAP_UNMAP_HIGH
	ADDRESS_MAP_GLOBAL_MASK(3)
	// coded in the rom as F8 to FB
	AM_RANGE( 0x00, 0x03 ) AM_DEVREADWRITE("ctc", z80ctc_device, read, write)
ADDRESS_MAP_END

/* Input ports */
static INPUT_PORTS_START( bcs3 )
	PORT_START("KEY.0")
	PORT_BIT(0x01, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_NAME("U") PORT_CODE(KEYCODE_U) PORT_CHAR('U')
	PORT_BIT(0x02, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_NAME("K :") PORT_CODE(KEYCODE_K) PORT_CHAR('K') PORT_CHAR(':')
	PORT_BIT(0x04, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_NAME("A &") PORT_CODE(KEYCODE_A) PORT_CHAR('A')
	PORT_BIT(0x08, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_NAME("0") PORT_CODE(KEYCODE_0) PORT_CHAR('0')

	PORT_START("KEY.1")
	PORT_BIT(0x01, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_NAME("V") PORT_CODE(KEYCODE_V) PORT_CHAR('V')
	PORT_BIT(0x02, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_NAME("L ;") PORT_CODE(KEYCODE_L) PORT_CHAR('L') PORT_CHAR(';')
	PORT_BIT(0x04, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_NAME("B '") PORT_CODE(KEYCODE_B) PORT_CHAR('B')
	PORT_BIT(0x08, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_NAME("1 !") PORT_CODE(KEYCODE_1) PORT_CHAR('1') PORT_CHAR('!')

	PORT_START("KEY.2")
	PORT_BIT(0x01, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_NAME("W") PORT_CODE(KEYCODE_W) PORT_CHAR('W')
	PORT_BIT(0x02, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_NAME("M <") PORT_CODE(KEYCODE_M) PORT_CHAR('M') PORT_CHAR('<')
	PORT_BIT(0x04, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_NAME("C (") PORT_CODE(KEYCODE_C) PORT_CHAR('C')
	PORT_BIT(0x08, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_NAME("2 \"") PORT_CODE(KEYCODE_2) PORT_CHAR('2') PORT_CHAR(34)

	PORT_START("KEY.3")
	PORT_BIT(0x01, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_NAME("X") PORT_CODE(KEYCODE_X) PORT_CHAR('X')
	PORT_BIT(0x02, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_NAME("N =") PORT_CODE(KEYCODE_N) PORT_CHAR('N') PORT_CHAR('=')
	PORT_BIT(0x04, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_NAME("D )") PORT_CODE(KEYCODE_D) PORT_CHAR('D')
	PORT_BIT(0x08, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_NAME("3 #") PORT_CODE(KEYCODE_3) PORT_CHAR('3') PORT_CHAR('#')

	PORT_START("KEY.4")
	PORT_BIT(0x01, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_NAME("Y") PORT_CODE(KEYCODE_Y) PORT_CHAR('Y')
	PORT_BIT(0x02, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_NAME("O >") PORT_CODE(KEYCODE_O) PORT_CHAR('O') PORT_CHAR('>')
	PORT_BIT(0x04, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_NAME("E *") PORT_CODE(KEYCODE_E) PORT_CHAR('E') PORT_CHAR('*')
	PORT_BIT(0x08, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_NAME("4 $") PORT_CODE(KEYCODE_4) PORT_CHAR('4') PORT_CHAR('$')

	PORT_START("KEY.5")
	PORT_BIT(0x01, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_NAME("Z") PORT_CODE(KEYCODE_Z) PORT_CHAR('Z')
	PORT_BIT(0x02, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_NAME("P") PORT_CODE(KEYCODE_P) PORT_CHAR('P')
	PORT_BIT(0x04, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_NAME("F +") PORT_CODE(KEYCODE_F) PORT_CHAR('F') PORT_CHAR('+')
	PORT_BIT(0x08, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_NAME("5 %") PORT_CODE(KEYCODE_5) PORT_CHAR('5') PORT_CHAR('%')

	PORT_START("KEY.6")
	PORT_BIT(0x01, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_NAME("Space") PORT_CODE(KEYCODE_SPACE) PORT_CHAR(32)
	PORT_BIT(0x02, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_NAME("Q") PORT_CODE(KEYCODE_Q) PORT_CHAR('Q')
	PORT_BIT(0x04, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_NAME("G ,") PORT_CODE(KEYCODE_G) PORT_CHAR('G') PORT_CHAR(',')
	PORT_BIT(0x08, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_NAME("6 &") PORT_CODE(KEYCODE_6) PORT_CHAR('6') PORT_CHAR('&')

	PORT_START("KEY.7")
	PORT_BIT(0x01, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_NAME("Backspace") PORT_CODE(KEYCODE_BACKSPACE) PORT_CHAR(8)
	PORT_BIT(0x02, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_NAME("R") PORT_CODE(KEYCODE_R) PORT_CHAR('R')
	PORT_BIT(0x04, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_NAME("H -") PORT_CODE(KEYCODE_H) PORT_CHAR('H') PORT_CHAR('-')
	PORT_BIT(0x08, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_NAME("7 '") PORT_CODE(KEYCODE_7) PORT_CHAR('7') PORT_CHAR(39)

	PORT_START("KEY.8")
	PORT_BIT(0x01, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_NAME("Enter") PORT_CODE(KEYCODE_ENTER) PORT_CHAR(13)
	PORT_BIT(0x02, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_NAME("S") PORT_CODE(KEYCODE_S) PORT_CHAR('S')
	PORT_BIT(0x04, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_NAME("I .") PORT_CODE(KEYCODE_I) PORT_CHAR('I') PORT_CHAR('.')
	PORT_BIT(0x08, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_NAME("8 (") PORT_CODE(KEYCODE_8) PORT_CHAR('8') PORT_CHAR('(')

	PORT_START("KEY.9")
	PORT_BIT(0x01, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_NAME("Shift") PORT_CODE(KEYCODE_LSHIFT) PORT_CODE(KEYCODE_RSHIFT) PORT_CHAR(UCHAR_SHIFT_1)
	PORT_BIT(0x02, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_NAME("T") PORT_CODE(KEYCODE_T) PORT_CHAR('T')
	PORT_BIT(0x04, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_NAME("J /") PORT_CODE(KEYCODE_J) PORT_CHAR('J') PORT_CHAR('/')
	PORT_BIT(0x08, IP_ACTIVE_HIGH, IPT_KEYBOARD) PORT_NAME("9 )") PORT_CODE(KEYCODE_9) PORT_CHAR('9') PORT_CHAR(')')
INPUT_PORTS_END

// Official version
UINT32 bcs3_state::screen_update_bcs3(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect)
{
	UINT8 y,ra,chr,gfx,rat;
	UINT16 sy=0,ma=0x50,x;

	for (y = 0; y < 12; y++)
	{
		for (ra = 0; ra < 10; ra++)
		{
			UINT16 *p = &bitmap.pix16(sy++);
			rat = (ra + 1) & 7;

			for (x = ma; x < ma + 28; x++)
			{
				if (ra < 8)
				{
					chr = m_p_videoram[x] & 0x7f;

					/* get pattern of pixels for that character scanline */
					gfx = m_p_chargen->base()[(chr<<3) | rat ] ^ 0xff;
				}
				else
					gfx = 0xff;

				/* Display a scanline of a character (8 pixels) */
				*p++ = BIT(gfx, 7);
				*p++ = BIT(gfx, 6);
				*p++ = BIT(gfx, 5);
				*p++ = BIT(gfx, 4);
				*p++ = BIT(gfx, 3);
				*p++ = BIT(gfx, 2);
				*p++ = BIT(gfx, 1);
				*p++ = BIT(gfx, 0);
			}
		}
		ma+=28;
	}
	return 0;
}

/* Hacks: When it starts, it has 4 lines of data. Pressing enter causes it to allocate 100 lines.
   I'm assuming that it only shows a portion of this, with the cursor always in sight. */
UINT32 bcs3_state::screen_update_bcs3a(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect)
{
	UINT8 y,ra,chr,gfx,rat;
	UINT16 sy = 0, ma = s_init, x;
	UINT16 cursor = (m_p_videoram[s_curs] | (m_p_videoram[s_curs+1] << 8)) - 0x3c00 - ma;  // get cursor relative position
	rat = cursor / (s_cols+1);
	if (rat > (s_rows-1)) ma += (rat-(s_rows-1)) * (s_cols+1);

	for (y = 0; y < s_rows; y++)
	{
		for (ra = 0; ra < 10; ra++)
		{
			UINT16 *p = &bitmap.pix16(sy++);
			rat = (ra + 1) & 7;

			for (x = ma; x < ma + s_cols; x++)
			{
				if (ra < 8)
				{
					chr = m_p_videoram[x] & 0x7f;

					/* get pattern of pixels for that character scanline */
					gfx = m_p_chargen->base()[(chr<<3) | rat ] ^ 0xff;
				}
				else
					gfx = 0xff;

				/* Display a scanline of a character (8 pixels) */
				*p++ = BIT(gfx, 7);
				*p++ = BIT(gfx, 6);
				*p++ = BIT(gfx, 5);
				*p++ = BIT(gfx, 4);
				*p++ = BIT(gfx, 3);
				*p++ = BIT(gfx, 2);
				*p++ = BIT(gfx, 1);
				*p++ = BIT(gfx, 0);
			}
		}
		ma+=(s_cols+1);
	}
	return 0;
}


/* F4 Character Displayer */
static const gfx_layout bcs3_charlayout =
{
	8, 8,                   /* 8 x 8 characters */
	128,                    /* 128 characters */
	1,                  /* 1 bits per pixel */
	{ 0 },                  /* no bitplanes */
	/* x offsets */
	{ 0, 1, 2, 3, 4, 5, 6, 7 },
	/* y offsets */
	{ 1*8, 2*8, 3*8, 4*8, 5*8, 6*8, 7*8, 0*8 },
	8*8                 /* every char takes 8 bytes */
};

static GFXDECODE_START( bcs3 )
	GFXDECODE_ENTRY( "chargen", 0x0000, bcs3_charlayout, 0, 1 )
GFXDECODE_END

WRITE_LINE_MEMBER( bcs3_state::ctc_z0_w )
{
	m_ctc->trg1(state);
	if (state)
	{
		m_cass_bit ^= 1;
		m_cass->output(m_cass_bit ? -1.0 : +1.0);
	}
}

WRITE_LINE_MEMBER( bcs3_state::ctc_z1_w )
{
	m_ctc->trg2(state);
}

static const z80_daisy_config daisy_chain_intf[] =
{
	{ "ctc" },
	{ NULL }
};

DRIVER_INIT_MEMBER( bcs3_state, bcs3a )
{
	s_curs = 0x7a;
	s_init = 0x80;
	s_rows = 12;
	s_cols = 29;
}

DRIVER_INIT_MEMBER( bcs3_state, bcs3b )
{
	s_curs = 0x7a;
	s_init = 0x80;
	s_rows = 24;
	s_cols = 40;
}

DRIVER_INIT_MEMBER( bcs3_state, bcs3c )
{
	s_curs = 0x08;
	s_init = 0xa0;
	s_rows = 12;
	s_cols = 29;
}

DRIVER_INIT_MEMBER( bcs3_state, bcs3d )
{
	s_curs = 0x08;
	s_init = 0xb4;
	s_rows = 12;
	s_cols = 29;
}

static MACHINE_CONFIG_START( bcs3, bcs3_state )

	/* basic machine hardware */
	MCFG_CPU_ADD("maincpu", Z80, XTAL_5MHz /2)
	MCFG_CPU_PROGRAM_MAP(bcs3_mem)
	MCFG_CPU_IO_MAP(bcs3_io)
	MCFG_CPU_CONFIG(daisy_chain_intf)

	/* video hardware */
	MCFG_SCREEN_ADD("screen", RASTER)
	MCFG_SCREEN_REFRESH_RATE(50)
	MCFG_SCREEN_VBLANK_TIME(ATTOSECONDS_IN_USEC(2500)) /* not accurate */
	MCFG_SCREEN_SIZE(28*8, 12*10)
	MCFG_SCREEN_VISIBLE_AREA(0,28*8-1,0,12*10-1)
	MCFG_SCREEN_UPDATE_DRIVER(bcs3_state, screen_update_bcs3)
	MCFG_SCREEN_PALETTE("palette")
	MCFG_GFXDECODE_ADD("gfxdecode", "palette", bcs3)
	MCFG_PALETTE_ADD_BLACK_AND_WHITE("palette")

	MCFG_DEVICE_ADD("ctc", Z80CTC, XTAL_5MHz / 2)
	MCFG_Z80CTC_INTR_CB(INPUTLINE("maincpu", INPUT_LINE_IRQ0))
	MCFG_Z80CTC_ZC0_CB(WRITELINE(bcs3_state, ctc_z0_w))
	MCFG_Z80CTC_ZC1_CB(WRITELINE(bcs3_state, ctc_z1_w))

	MCFG_CASSETTE_ADD( "cassette" )
MACHINE_CONFIG_END

static MACHINE_CONFIG_START( bcs3a, bcs3_state )

	/* basic machine hardware */
	MCFG_CPU_ADD("maincpu", Z80, XTAL_7MHz /2)
	MCFG_CPU_PROGRAM_MAP(bcs3a_mem)
	MCFG_CPU_IO_MAP(bcs3_io)
	MCFG_CPU_CONFIG(daisy_chain_intf)

	/* video hardware */
	MCFG_SCREEN_ADD("screen", RASTER)
	MCFG_SCREEN_REFRESH_RATE(50)
	MCFG_SCREEN_VBLANK_TIME(ATTOSECONDS_IN_USEC(2500)) /* not accurate */
	MCFG_SCREEN_SIZE(29*8, 12*10)
	MCFG_SCREEN_VISIBLE_AREA(0,29*8-1,0,12*10-1)
	MCFG_SCREEN_UPDATE_DRIVER(bcs3_state, screen_update_bcs3a)
	MCFG_SCREEN_PALETTE("palette")
	MCFG_GFXDECODE_ADD("gfxdecode", "palette", bcs3)
	MCFG_PALETTE_ADD_BLACK_AND_WHITE("palette")

	MCFG_DEVICE_ADD("ctc", Z80CTC, XTAL_7MHz / 2)
	MCFG_Z80CTC_INTR_CB(INPUTLINE("maincpu", INPUT_LINE_IRQ0))
	MCFG_Z80CTC_ZC0_CB(WRITELINE(bcs3_state, ctc_z0_w))
	MCFG_Z80CTC_ZC1_CB(WRITELINE(bcs3_state, ctc_z1_w))

	MCFG_CASSETTE_ADD( "cassette" )
MACHINE_CONFIG_END

static MACHINE_CONFIG_DERIVED( bcs3b, bcs3a )
	MCFG_SCREEN_MODIFY("screen")
	MCFG_SCREEN_SIZE(40*8, 24*10)
	MCFG_SCREEN_VISIBLE_AREA(0,40*8-1,0,24*10-1)
MACHINE_CONFIG_END


/* ROM definition */
ROM_START( bcs3 )
	ROM_REGION( 0x2000, "roms", ROMREGION_ERASEFF )
	//ROM_LOAD( "se24.bin", 0x0000, 0x0800, CRC(268de5ee) SHA1(78784945956c1b0282a4e82ad55e7c3a77389e50))
	ROM_LOAD( "se24_000.d6", 0x0000, 0x0400, CRC(157a0d28) SHA1(0a6666c289b95d98128fd282478dff6319031b6e) )
	ROM_LOAD( "se24_400.d7", 0x0400, 0x0400, CRC(2159de0f) SHA1(09b567e750931019de914f25d5ab1e4910465de6) )

	ROM_REGION( 0x0400, "chargen", 0 )
	ROM_LOAD( "bcs_zg_24.d21", 0x0000, 0x0400, CRC(eaed9d84) SHA1(7023a6187cd6bd0c6489d76ff662453f14e5b636))
ROM_END

ROM_START( bcs3a )
	ROM_REGION( 0x2000, "roms", ROMREGION_ERASEFF )
	//ROM_LOAD( "se31_29.bin", 0x0000, 0x1000, CRC(e9b55544) SHA1(82bae68c4bcaecf66632f5b43913b50a1acba316))
	ROM_LOAD( "se31_000.d6", 0x0000, 0x0400, CRC(0765bd83) SHA1(137ceffd50eeaf21caab286d3e01161ba3267ea4) )
	ROM_LOAD( "se31_400.d7", 0x0400, 0x0400, CRC(1a87a3ed) SHA1(c8121ff198f8cf0c7bc7bc7e258ecfa51d3bb02c) )
	ROM_LOAD( "se31_800.d8", 0x0800, 0x0400, CRC(05654a8f) SHA1(b42fa6cf5710dab23f062dbeea81e85b4c18e1b0) )
	ROM_LOAD( "se31_c00.d9", 0x0c00, 0x0400, CRC(858ca28b) SHA1(90f943b0c1d102dd058a859ba139057a0bd278a6) )
	ROM_LOAD( "se31mceditor.bin", 0x1000, 0x0400, CRC(8eac92ec) SHA1(8950a3ef05d02abf34269bfce002c46d273ce113))

	ROM_REGION( 0x0400, "chargen", 0 )
	ROM_LOAD( "bcs_zg_31.d21", 0x0000, 0x0400, CRC(a20c93c9) SHA1(b2be1c0d98b7ac05713349b099b392975968be1d))
ROM_END

ROM_START( bcs3b )
	ROM_REGION( 0x2000, "roms", ROMREGION_ERASEFF )
	ROM_LOAD( "se31_40.bin", 0x0000, 0x1000, CRC(4e993152) SHA1(6bb01ff5779627fa2eb2df432fffcfccc1e33231))
	ROM_LOAD( "se31mceditor.bin", 0x1000, 0x0400, CRC(8eac92ec) SHA1(8950a3ef05d02abf34269bfce002c46d273ce113))

	ROM_REGION( 0x0400, "chargen", 0 )
	ROM_LOAD( "bcs_zg_31.d21", 0x0000, 0x0400, CRC(a20c93c9) SHA1(b2be1c0d98b7ac05713349b099b392975968be1d))
ROM_END

ROM_START( bcs3c )
	ROM_REGION( 0x2000, "roms", ROMREGION_ERASEFF )
	ROM_LOAD( "bcs32.bin", 0x0000, 0x1000, CRC(1523b846) SHA1(ca5e3213707a604e02d9e7a7ebfc362ef294ddb8) )

	ROM_REGION( 0x0400, "chargen", 0 )
	ROM_LOAD( "bcs_zg_32.d21", 0x0000, 0x0400, CRC(abe9e820) SHA1(03a8792d08774cd67b98efd3f83a78e897b4e001) )
ROM_END

ROM_START( bcs3d )
	ROM_REGION( 0x2000, "roms", ROMREGION_ERASEFF )
	ROM_LOAD( "sp33_29.bin", 0x0000, 0x1000, CRC(1c851eb2) SHA1(4f8bb5274ea1861a35a840e8f3482bdc693047c4))

	ROM_REGION( 0x0400, "chargen", 0 )
	ROM_LOAD( "bcs_zg_33.d21", 0x0000, 0x0400, CRC(b27f1c07) SHA1(61c80c585f198370ba5e856839c12b15acdc58ee))
ROM_END

/* Driver */

/*    YEAR  NAME    PARENT  COMPAT   MACHINE    INPUT  CLASS          INIT        COMPANY             FULLNAME       FLAGS */
COMP( 1984, bcs3,   0,       0,      bcs3,      bcs3,  driver_device,   0,     "Eckhard Schiller", "BCS 3 rev 2.4", MACHINE_NOT_WORKING | MACHINE_NO_SOUND_HW )
COMP( 1986, bcs3a,  bcs3,    0,      bcs3a,     bcs3,  bcs3_state,  bcs3a,     "Eckhard Schiller", "BCS 3 rev 3.1 29-column", MACHINE_NOT_WORKING | MACHINE_NO_SOUND_HW )
COMP( 1986, bcs3b,  bcs3,    0,      bcs3b,     bcs3,  bcs3_state,  bcs3b,     "Eckhard Schiller", "BCS 3 rev 3.1 40-column", MACHINE_NOT_WORKING | MACHINE_NO_SOUND_HW )
COMP( 1986, bcs3c,  bcs3,    0,      bcs3a,     bcs3,  bcs3_state,  bcs3c,     "Eckhard Schiller", "BCS 3 rev 3.2", MACHINE_NOT_WORKING | MACHINE_NO_SOUND_HW )
COMP( 1986, bcs3d,  bcs3,    0,      bcs3a,     bcs3,  bcs3_state,  bcs3d,     "Eckhard Schiller", "BCS 3 rev 3.3", MACHINE_NOT_WORKING | MACHINE_NO_SOUND_HW )