summaryrefslogtreecommitdiffstatshomepage
path: root/src/mess/drivers/dim68k.c
blob: 9c12fb1caffbaaf8fc29504423b3e488fa497f3d (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
// license:MAME
// copyright-holders:Robbbert
/***************************************************************************

        Micro Craft Dimension 68000

        28/12/2011 Skeleton driver.

        This computer had the facility for plug-in cards to emulate popular
        computers of the time such as apple, trs80, kaypro, etc. The floppy
        disk parameters could be set to be able to read the disks of the
        various systems, or you create any other format you wished.

        There is no schematic available, so not fully able to emulate at
        this time.

        ToDo:

        - Floppy controller
        - Floppy formats (not sure if MESS supports user-defined formats)
        - Banking
        - Graphics display (including colour and video_control options)
        - DUART
        - RTC
        - RS232 interface
        - Keyboard
        - Centronics printer
        - Video-high
        - Video-reset
        - Game switches, paddles and timers
        - The plug-in boards
        - Emulator trap function

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

#include "emu.h"
#include "cpu/m68000/m68000.h"
#include "sound/speaker.h"
#include "video/mc6845.h"
#include "machine/keyboard.h"
#include "machine/upd765.h"


class dim68k_state : public driver_device
{
public:
	dim68k_state(const machine_config &mconfig, device_type type, const char *tag)
		: driver_device(mconfig, type, tag),
		m_maincpu(*this, "maincpu"),
		m_crtc(*this, "crtc"),
		m_speaker(*this, "speaker"),
		m_ram(*this, "ram"),
		m_palette(*this, "palette") { }

	DECLARE_READ16_MEMBER( dim68k_duart_r );
	DECLARE_READ16_MEMBER( dim68k_fdc_r );
	DECLARE_READ16_MEMBER( dim68k_game_switches_r );
	DECLARE_READ16_MEMBER( dim68k_speaker_r );
	DECLARE_WRITE16_MEMBER( dim68k_banksw_w );
	DECLARE_WRITE16_MEMBER( dim68k_duart_w );
	DECLARE_WRITE16_MEMBER( dim68k_fdc_w );
	DECLARE_WRITE16_MEMBER( dim68k_printer_strobe_w );
	DECLARE_WRITE16_MEMBER( dim68k_reset_timers_w );
	DECLARE_WRITE16_MEMBER( dim68k_speaker_w );
	DECLARE_WRITE16_MEMBER( dim68k_video_control_w );
	DECLARE_WRITE16_MEMBER( dim68k_video_high_w );
	DECLARE_WRITE16_MEMBER( dim68k_video_reset_w );
	DECLARE_WRITE8_MEMBER(kbd_put);
	MC6845_UPDATE_ROW(crtc_update_row);
	const UINT8 *m_p_chargen;
	bool m_speaker_bit;
	UINT8 m_video_control;
	UINT8 m_term_data;
	virtual void machine_reset();
	virtual void video_start();
	required_device<cpu_device> m_maincpu;
	required_device<mc6845_device> m_crtc;
	required_device<speaker_sound_device> m_speaker;
	required_shared_ptr<UINT16> m_ram;
	required_device<palette_device> m_palette;
};

READ16_MEMBER( dim68k_state::dim68k_duart_r )
// Port A is for the keyboard : 300 baud, no parity, 8 bits, 1 stop bit. Port B is for RS232.
// The device also controls the parallel printer (except the strobe) and the RTC.
// Device = SCN2681, not emulated. The keyboard is standard ASCII, so we can use the terminal
// keyboard for now.
{
	if (offset==3)
		return m_term_data;
	else
	return 0;
}

READ16_MEMBER( dim68k_state::dim68k_fdc_r )
{
	return 0;
}

READ16_MEMBER( dim68k_state::dim68k_game_switches_r )
// Reading the game port switches
// FFCC11 = switch 0; FFCC13 = switch 1, etc to switch 3
// FFCC19 = paddle 0; FFCC1B = paddle 1, etc to paddle 3
{
	return 0xffff;
}

READ16_MEMBER( dim68k_state::dim68k_speaker_r )
// Any read or write of this address will toggle the position of the speaker cone
{
	m_speaker_bit ^= 1;
	m_speaker->level_w(m_speaker_bit);
	return 0;
}

WRITE16_MEMBER( dim68k_state::dim68k_speaker_w )
{
	m_speaker_bit ^= 1;
	m_speaker->level_w(m_speaker_bit);
}

WRITE16_MEMBER( dim68k_state::dim68k_fdc_w )
{
}

WRITE16_MEMBER( dim68k_state::dim68k_video_high_w )
// "write high byte of address in memory of start of display buffer"
{
}

WRITE16_MEMBER( dim68k_state::dim68k_video_control_w )
{
/* D7 0 = Hires/Graphics; 1= Lores/Text [not emulated yet]
   D6 0 = 8 dots per character; 1 = 7 dots [emulated]
   D5 0 = CRTC and CPU run Asynchronously; 1 = Synchronously [won't be emulated]
   D4,D3  Dot clock: 00=14MHz; 01=3.58MHz; 10=7MHz; 11=1.79MHz [emulated]
   D2 0 = Screen On; 1 = Off [emulated]
   D1 0 = Standard Chars & LoRes; 1 = Alternate Chars & HiRes [not emulated yet]
   D0 0 = Non-Mixed (all text or all Graphics); 1 = Mixed (Colour Graphics and Monochrome Text) [not emulated yet]
 */
	m_crtc->set_hpixels_per_column((data & 0x40) ? 7 : 8);
	m_video_control = data;

	switch (data & 0x18)
	{
		case 0x00: m_crtc->set_clock(XTAL_14MHz);
					break;
		case 0x08: m_crtc->set_clock(XTAL_3_579545MHz);
					break;
		case 0x10: m_crtc->set_clock(XTAL_14MHz / 2);
					break;
		case 0x18: m_crtc->set_clock(XTAL_3_579545MHz / 2);
					break;
	}
}

WRITE16_MEMBER( dim68k_state::dim68k_video_reset_w )
{
}

WRITE16_MEMBER( dim68k_state::dim68k_duart_w )
{
}

WRITE16_MEMBER( dim68k_state::dim68k_reset_timers_w )
// reset game port timer before reading paddles
{
}

WRITE16_MEMBER( dim68k_state::dim68k_printer_strobe_w )
// anything sent here will trigger a one-shot for a strobe pulse
{
}

WRITE16_MEMBER( dim68k_state::dim68k_banksw_w )
// At boot time, the rom and IO occupy 0-FFFF, this moves it to the proper place
{
}

static ADDRESS_MAP_START(dim68k_mem, AS_PROGRAM, 16, dim68k_state)
	ADDRESS_MAP_UNMAP_HIGH
	AM_RANGE(0x00000000, 0x00feffff) AM_RAM AM_SHARE("ram") // 16MB RAM / ROM at boot
	AM_RANGE(0x00ff0000, 0x00ff1fff) AM_ROM AM_REGION("bootrom", 0)
	AM_RANGE(0x00ff2000, 0x00ff7fff) AM_RAM // Graphics Video RAM
	AM_RANGE(0x00ff8000, 0x00ff8001) AM_DEVREADWRITE8("crtc", mc6845_device, status_r, address_w, 0xff)
	AM_RANGE(0x00ff8002, 0x00ff8003) AM_DEVREADWRITE8("crtc", mc6845_device, register_r, register_w, 0xff)
	AM_RANGE(0x00ff8004, 0x00ff8005) AM_WRITE(dim68k_video_high_w)
	AM_RANGE(0x00ff8008, 0x00ff8009) AM_WRITE(dim68k_video_control_w)
	AM_RANGE(0x00ff800a, 0x00ff800b) AM_WRITE(dim68k_video_reset_w)
	AM_RANGE(0x00ff8800, 0x00ff8fff) AM_ROM AM_REGION("cop6512",0) // slot 1 controller rom
	AM_RANGE(0x00ff9000, 0x00ff97ff) AM_ROM AM_REGION("copz80",0) // slot 2 controller rom
	AM_RANGE(0x00ff9800, 0x00ff9fff) AM_ROM AM_REGION("cop8086",0) // slot 3 controller rom
#if 0
	AM_RANGE(0x00ffa000, 0x00ffa7ff) AM_ROM // slot 4 controller rom
	AM_RANGE(0x00ffa800, 0x00ffafff) AM_ROM // slot 5 controller rom
	AM_RANGE(0x00ffb000, 0x00ffb7ff) AM_ROM // slot 6 controller rom
#endif
	AM_RANGE(0x00ffc400, 0x00ffc41f) AM_READWRITE(dim68k_duart_r,dim68k_duart_w) // Signetics SCN2681AC1N40 Dual UART
	AM_RANGE(0x00ffc800, 0x00ffc801) AM_READWRITE(dim68k_speaker_r,dim68k_speaker_w)
	AM_RANGE(0x00ffcc00, 0x00ffcc1f) AM_READWRITE(dim68k_game_switches_r,dim68k_reset_timers_w)
	AM_RANGE(0x00ffd000, 0x00ffd003) AM_DEVICE8("fdc",upd765a_device,map,0x00ff) // NEC uPD765A
	AM_RANGE(0x00ffd004, 0x00ffd005) AM_READWRITE(dim68k_fdc_r,dim68k_fdc_w)
	//AM_RANGE(0x00ffd400, 0x00ffd403) emulation trap control
	AM_RANGE(0x00ffd800, 0x00ffd801) AM_WRITE(dim68k_printer_strobe_w)
	AM_RANGE(0x00ffdc00, 0x00ffdc01) AM_WRITE(dim68k_banksw_w)
ADDRESS_MAP_END

/* Input ports */
static INPUT_PORTS_START( dim68k )
INPUT_PORTS_END


void dim68k_state::machine_reset()
{
	UINT8* ROM = memregion("bootrom")->base();

	memcpy((UINT8*)m_ram.target(), ROM, 0x2000);

	m_maincpu->reset();
}

void dim68k_state::video_start()
{
	m_p_chargen = memregion("chargen")->base();
}

// Text-only; graphics isn't emulated yet. Need to find out if hardware cursor is used.
MC6845_UPDATE_ROW( dim68k_state::crtc_update_row )
{
	const rgb_t *palette = m_palette->palette()->entry_list_raw();
	UINT8 chr,gfx,x,xx,inv;
	UINT16 chr16=0x2020; // set to spaces if screen is off
	UINT32 *p = &bitmap.pix32(y);
	UINT8 screen_on = ~m_video_control & 4;
	UINT8 dot8 = ~m_video_control & 40;

	// need to divide everything in half to cater for 16-bit reads
	x_count /= 2;
	ma /= 2;
	xx = 0;

	for (x = 0; x < x_count; x++)
	{
		if (screen_on)
			chr16 = m_ram[ma+x]; // reads 2 characters

		inv=0;
		if (xx == cursor_x && screen_on) inv=0xff;
		xx++;

		chr = chr16>>8;
		gfx = m_p_chargen[(chr<<4) | ra] ^ inv ^ ((chr & 0x80) ? 0xff : 0);
		*p++ = palette[BIT(gfx, 7)];
		*p++ = palette[BIT(gfx, 6)];
		*p++ = palette[BIT(gfx, 5)];
		*p++ = palette[BIT(gfx, 4)];
		*p++ = palette[BIT(gfx, 3)];
		*p++ = palette[BIT(gfx, 2)];
		*p++ = palette[BIT(gfx, 1)];
		if (dot8) *p++ = palette[BIT(gfx, 1)];

		inv = 0;
		if (xx == cursor_x) inv=0xff;
		xx++;

		chr = chr16;
		gfx = m_p_chargen[(chr<<4) | ra] ^ inv ^ ((chr & 0x80) ? 0xff : 0);
		*p++ = palette[BIT(gfx, 7)];
		*p++ = palette[BIT(gfx, 6)];
		*p++ = palette[BIT(gfx, 5)];
		*p++ = palette[BIT(gfx, 4)];
		*p++ = palette[BIT(gfx, 3)];
		*p++ = palette[BIT(gfx, 2)];
		*p++ = palette[BIT(gfx, 1)];
		if (dot8) *p++ = palette[BIT(gfx, 1)];
	}
}

/* F4 Character Displayer */
static const gfx_layout dim68k_charlayout =
{
	8, 16,                  /* 8 x 16 characters */
	256,                    /* 256 characters */
	1,                  /* 1 bits per pixel */
	{ 0 },                  /* no bitplanes */
	/* x offsets */
	{ 0, 1, 2, 3, 4, 5, 6, 7 },
	/* y offsets */
	{ 0*8, 1*8, 2*8, 3*8, 4*8, 5*8, 6*8, 7*8, 8*8, 9*8, 10*8, 11*8, 12*8, 13*8, 14*8, 15*8 },
	8*16                    /* every char takes 16 bytes */
};

static GFXDECODE_START( dim68k )
	GFXDECODE_ENTRY( "chargen", 0x0000, dim68k_charlayout, 0, 1 )
GFXDECODE_END

static SLOT_INTERFACE_START( dim68k_floppies )
	SLOT_INTERFACE( "525hd", FLOPPY_525_HD )
SLOT_INTERFACE_END

WRITE8_MEMBER( dim68k_state::kbd_put )
{
	m_term_data = data;
}

static MACHINE_CONFIG_START( dim68k, dim68k_state )
	/* basic machine hardware */
	MCFG_CPU_ADD("maincpu", M68000, XTAL_10MHz)
	MCFG_CPU_PROGRAM_MAP(dim68k_mem)

	/* video hardware */
	MCFG_SCREEN_ADD("screen", RASTER)
	MCFG_SCREEN_REFRESH_RATE(50)
	MCFG_SCREEN_VBLANK_TIME(ATTOSECONDS_IN_USEC(2500)) /* not accurate */
	MCFG_SCREEN_UPDATE_DEVICE("crtc", mc6845_device, screen_update)
	MCFG_SCREEN_SIZE(640, 480)
	MCFG_SCREEN_VISIBLE_AREA(0, 640-1, 0, 250-1)
	MCFG_PALETTE_ADD_BLACK_AND_WHITE("palette")
	MCFG_GFXDECODE_ADD("gfxdecode", "palette", dim68k)

	/* sound hardware */
	MCFG_SPEAKER_STANDARD_MONO("mono")
	MCFG_SOUND_ADD("speaker", SPEAKER_SOUND, 0)
	MCFG_SOUND_ROUTE(ALL_OUTPUTS, "mono", 0.50)

	/* Devices */
	MCFG_UPD765A_ADD("fdc", true, true) // these options unknown
	MCFG_FLOPPY_DRIVE_ADD("fdc:0", dim68k_floppies, "525hd", floppy_image_device::default_floppy_formats)
	MCFG_FLOPPY_DRIVE_ADD("fdc:1", dim68k_floppies, "525hd", floppy_image_device::default_floppy_formats)

	MCFG_MC6845_ADD("crtc", MC6845, "screen", 1790000)
	MCFG_MC6845_SHOW_BORDER_AREA(false)
	MCFG_MC6845_CHAR_WIDTH(8)
	MCFG_MC6845_UPDATE_ROW_CB(dim68k_state, crtc_update_row)

	MCFG_DEVICE_ADD("keyboard", GENERIC_KEYBOARD, 0)
	MCFG_GENERIC_KEYBOARD_CB(WRITE8(dim68k_state, kbd_put))
MACHINE_CONFIG_END

/*
68000

MC101A  82S100
MC102B  82S100
MC103E  2732A
MC104   2732A   label "4050" underneath
MC105   2732A   char gen

6512

MC106   82LS135 U24
MC107   82LS135 U20
MC108   82S137  U23
MC109   82S131  U16
MC110   82LS135 U35

Z80

MC111   82S123  U11

8086

MC112   82LS135 U18
MC113   82S153  U16
*/
/* ROM definition */
ROM_START( dim68k )
	ROM_REGION( 0x2000, "bootrom", ROMREGION_ERASEFF )
	ROM_LOAD16_BYTE( "mc103e.bin", 0x0000, 0x1000, CRC(4730c902) SHA1(5c4bb79ad22def721a22eb63dd05e0391c8082be))
	ROM_LOAD16_BYTE( "mc104.bin",  0x0001, 0x1000, CRC(14b04575) SHA1(43e15d9ebe1c9c1bf1bcfc1be3899a49e6748200))

	ROM_REGION( 0x1000, "chargen", ROMREGION_ERASEFF )
	ROM_LOAD( "mc105e.bin", 0x0000, 0x1000, CRC(7a09daa8) SHA1(844bfa579293d7c3442fcbfa21bda75fff930394))

	// The remaining roms may not be in the correct positions or being loaded correctly
	ROM_REGION( 0x1000, "cop6512", ROMREGION_ERASEFF )
	ROM_LOAD16_WORD_SWAP( "mc106.bin", 0x0000, 0x0100, CRC(11530d8a) SHA1(e3eae266535383bcaee2d84d7bed6052d40e4e4a))
	ROM_LOAD16_WORD_SWAP( "mc107.bin", 0x0100, 0x0100, CRC(966db11b) SHA1(3c3105ac842602d8e01b0f924152fd672a85f00c))
	ROM_LOAD16_WORD_SWAP( "mc108.bin", 0x0200, 0x0400, CRC(687f9b0a) SHA1(ed9f1265b25f89f6d3cf8cd0a7b0fb73cb129f9f))
	ROM_LOAD16_WORD_SWAP( "mc109.bin", 0x0600, 0x0200, CRC(4a857f98) SHA1(9f2bbc2171fc49f65aa798c9cd7799a26afd2ddf))
	ROM_LOAD16_WORD_SWAP( "mc110.bin", 0x0800, 0x0100, CRC(e207b457) SHA1(a8987ba3d1bbdb3d8b3b11cec90c532ff09e762e))

	ROM_REGION( 0x1000, "copz80", ROMREGION_ERASEFF )
	ROM_LOAD16_WORD_SWAP( "mc111.bin", 0x0000, 0x0020, CRC(6a380057) SHA1(6522a7b3e0af9db14a6ed04d4eec3ee6e44c2dab))

	ROM_REGION( 0x1000, "cop8086", ROMREGION_ERASEFF )
	ROM_LOAD16_WORD_SWAP( "mc112.bin", 0x0000, 0x0100, CRC(dfd4cdbb) SHA1(a7831d415943fa86c417066807038bccbabb2573))
	ROM_LOAD( "mc113.bin", 0x0100, 0x00ef, CRC(594bdf05) SHA1(36db911a27d930e023fa12683e86e9eecfffdba6))

	ROM_REGION( 0x1000, "mb", ROMREGION_ERASEFF )   // mainboard unknown
	ROM_LOAD( "mc102.bin", 0x0000, 0x00fa, CRC(38e2abac) SHA1(0d7e730b46fc162764c69c51dea3bbe8337b1a7d))
	ROM_LOAD( "mc101.bin", 0x0100, 0x00fa, CRC(caffb3a0) SHA1(36f5140b306565794c4d856e0c20589b8f2a37f4))
ROM_END

/* Driver */

/*    YEAR  NAME    PARENT  COMPAT   MACHINE    INPUT    INIT    COMPANY   FULLNAME       FLAGS */
COMP( 1984, dim68k,  0,       0,     dim68k,   dim68k, driver_device,   0,     "Micro Craft", "Dimension 68000", GAME_NOT_WORKING)