summaryrefslogtreecommitdiffstatshomepage
path: root/src/mess/drivers/nascom1.c
blob: 14abe9a1e40f77f48ac8ef01ca7ff71420fc3e80 (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
/************************************************************************

    Nascom 1 and Nascom 2

    license: MAME
    copyright-holders: (Original Author?), Dirk Best


    Memory map

    CPU: z80
        0000-03ff   ROM (Nascom1 Monitor)
        0400-07ff   ROM (Nascom2 Monitor extension)
        0800-0bff   RAM (Screen)
        0c00-0c7f   RAM (OS workspace)
        0c80-0cff   RAM (extended OS workspace)
        0d00-0f7f   RAM (Firmware workspace)
        0f80-0fff   RAM (Stack space)
        1000-8fff   RAM (User space)
        9000-97ff   RAM (Programmable graphics RAM/User space)
        9800-afff   RAM (Colour graphics RAM/User space)
        b000-b7ff   ROM (OS extensions)
        b800-bfff   ROM (WP/Naspen software)
        c000-cfff   ROM (Disassembler/colour graphics software)
        d000-dfff   ROM (Assembler/Basic extensions)
        e000-ffff   ROM (Nascom2 Basic)

    Interrupts:

    Ports:
        OUT (00)    0:  Increment keyboard scan
                1:  Reset keyboard scan
                2:
                3:  Read from cassette
                4:
                5:
                6:
                7:
        IN  (00)    Read keyboard
        OUT (01)    Write to cassette/serial
        IN  (01)    Read from cassette/serial
        OUT (02)    Unused
        IN  (02)    ?

    Monitors:
        Nasbug1     1K  Original Nascom1
        Nasbug2         1K
        Nasbug3     Probably non existing
        Nasbug4     2K
        Nassys1     2K  Original Nascom2
        Nassys2     Probably non existing
        Nassys3     2K
        Nassys4     2K
        T4      2K

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

/* Core includes */
#include "emu.h"
#include "includes/nascom1.h"

/* Components */
#include "cpu/z80/z80.h"
#include "machine/wd17xx.h"
#include "machine/z80pio.h"

/* Devices */
#include "imagedev/flopdrv.h"
#include "formats/basicdsk.h"
#include "imagedev/cartslot.h"
#include "imagedev/cassette.h"
#include "machine/ram.h"


/*************************************
 *
 *  Memory maps
 *
 *************************************/

static ADDRESS_MAP_START( nascom1_mem, AS_PROGRAM, 8, nascom1_state )
	AM_RANGE(0x0000, 0x07ff) AM_ROM
	AM_RANGE(0x0800, 0x0bff) AM_RAM AM_SHARE("videoram")
	AM_RANGE(0x0c00, 0x0fff) AM_RAM
	AM_RANGE(0x1000, 0x13ff) AM_RAM /* 1Kb */
	AM_RANGE(0x1400, 0x4fff) AM_RAM /* 16Kb */
	AM_RANGE(0x5000, 0x8fff) AM_RAM /* 32Kb */
	AM_RANGE(0x9000, 0xafff) AM_RAM /* 40Kb */
	AM_RANGE(0xb000, 0xffff) AM_ROM
ADDRESS_MAP_END


static ADDRESS_MAP_START( nascom1_io, AS_IO, 8, nascom1_state )
	ADDRESS_MAP_GLOBAL_MASK(0x0F)
	AM_RANGE(0x00, 0x00) AM_READWRITE(nascom1_port_00_r, nascom1_port_00_w)
	AM_RANGE(0x01, 0x01) AM_READWRITE(nascom1_port_01_r, nascom1_port_01_w)
	AM_RANGE(0x02, 0x02) AM_READ(nascom1_port_02_r)
	AM_RANGE(0x04, 0x07) AM_DEVREADWRITE("z80pio", z80pio_device, read, write )
ADDRESS_MAP_END


static ADDRESS_MAP_START( nascom2_io, AS_IO, 8, nascom1_state )
	ADDRESS_MAP_GLOBAL_MASK(0xff)
	AM_RANGE(0x00, 0x00) AM_READWRITE(nascom1_port_00_r, nascom1_port_00_w)
	AM_RANGE(0x01, 0x01) AM_READWRITE(nascom1_port_01_r, nascom1_port_01_w)
	AM_RANGE(0x02, 0x02) AM_READ(nascom1_port_02_r)
	AM_RANGE(0x04, 0x07) AM_DEVREADWRITE("z80pio", z80pio_device, read, write )
	AM_RANGE(0xe0, 0xe3) AM_DEVREADWRITE("wd1793", fd1793_device, read, write)
	AM_RANGE(0xe4, 0xe4) AM_READWRITE(nascom2_fdc_select_r, nascom2_fdc_select_w)
	AM_RANGE(0xe5, 0xe5) AM_READ(nascom2_fdc_status_r)
ADDRESS_MAP_END



/*************************************
 *
 *  GFX layouts
 *
 *************************************/

static const gfx_layout nascom1_charlayout =
{
	8, 16,
	128,
	1,
	{ 0 },
	{ 0, 1, 2, 3, 4, 5, 6, 7 },
	{ 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
};


static GFXDECODE_START( nascom1 )
	GFXDECODE_ENTRY("gfx1", 0x0000, nascom1_charlayout, 0, 1)
GFXDECODE_END


static const gfx_layout nascom2_charlayout =
{
	8, 14,
	256,
	1,
	{ 0 },
	{ 0, 1, 2, 3, 4, 5, 6, 7 },
	{ 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 },
	8 * 16
};


static GFXDECODE_START( nascom2 )
	GFXDECODE_ENTRY("gfx1", 0x0000, nascom2_charlayout, 0, 1)
GFXDECODE_END



/*************************************
 *
 *  Input ports
 *
 *************************************/

static INPUT_PORTS_START( nascom1 )
	PORT_START("KEY0")
	PORT_BIT(0x6f, IP_ACTIVE_LOW, IPT_UNUSED)
	PORT_BIT(0x10, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_LSHIFT) PORT_CODE(KEYCODE_RSHIFT) PORT_CHAR(UCHAR_SHIFT_1)

	PORT_START("KEY1")
	PORT_BIT(0x01, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_H)  PORT_CHAR('H') PORT_CHAR('h')
	PORT_BIT(0x02, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_B)  PORT_CHAR('B') PORT_CHAR('b')
	PORT_BIT(0x04, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_5)  PORT_CHAR('5') PORT_CHAR('%')
	PORT_BIT(0x08, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_F)  PORT_CHAR('F') PORT_CHAR('f')
	PORT_BIT(0x10, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_X)  PORT_CHAR('X') PORT_CHAR('x')
	PORT_BIT(0x20, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_T)  PORT_CHAR('T') PORT_CHAR('t')
	PORT_BIT(0x40, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_UP) PORT_CHAR(UCHAR_MAMEKEY(UP))

	PORT_START("KEY2")
	PORT_BIT(0x01, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_J)    PORT_CHAR('J') PORT_CHAR('j')
	PORT_BIT(0x02, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_N)    PORT_CHAR('N') PORT_CHAR('n')
	PORT_BIT(0x04, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_6)    PORT_CHAR('6') PORT_CHAR('&')
	PORT_BIT(0x08, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_D)    PORT_CHAR('D') PORT_CHAR('d')
	PORT_BIT(0x10, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_Z)    PORT_CHAR('Z') PORT_CHAR('z')
	PORT_BIT(0x20, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_Y)    PORT_CHAR('Y') PORT_CHAR('y')
	PORT_BIT(0x40, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_LEFT) PORT_CHAR(UCHAR_MAMEKEY(LEFT))

	PORT_START("KEY3")
	PORT_BIT(0x01, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_K)    PORT_CHAR('K') PORT_CHAR('k')
	PORT_BIT(0x02, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_M)    PORT_CHAR('M') PORT_CHAR('m')
	PORT_BIT(0x04, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_7)    PORT_CHAR('7') PORT_CHAR('\'')
	PORT_BIT(0x08, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_E)    PORT_CHAR('E') PORT_CHAR('e')
	PORT_BIT(0x10, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_S)    PORT_CHAR('S') PORT_CHAR('s')
	PORT_BIT(0x20, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_U)    PORT_CHAR('U') PORT_CHAR('u')
	PORT_BIT(0x40, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_DOWN) PORT_CHAR(UCHAR_MAMEKEY(DOWN))

	PORT_START("KEY4")
	PORT_BIT(0x01, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_L)     PORT_CHAR('L') PORT_CHAR('l')
	PORT_BIT(0x02, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_COMMA) PORT_CHAR(',') PORT_CHAR('<')
	PORT_BIT(0x04, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_8)     PORT_CHAR('8') PORT_CHAR('(')
	PORT_BIT(0x08, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_W)     PORT_CHAR('W') PORT_CHAR('w')
	PORT_BIT(0x10, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_A)     PORT_CHAR('A') PORT_CHAR('a')
	PORT_BIT(0x20, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_I)     PORT_CHAR('I') PORT_CHAR('i')
	PORT_BIT(0x40, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_RIGHT) PORT_CHAR(UCHAR_MAMEKEY(RIGHT))

	PORT_START("KEY5")
	PORT_BIT(0x01, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_COLON) PORT_CHAR(';') PORT_CHAR('+')
	PORT_BIT(0x02, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_STOP)  PORT_CHAR('.') PORT_CHAR('>')
	PORT_BIT(0x04, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_9)     PORT_CHAR('9') PORT_CHAR(')')
	PORT_BIT(0x08, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_3)     PORT_CHAR('3') PORT_CHAR('\xA3')
	PORT_BIT(0x10, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_Q)     PORT_CHAR('Q') PORT_CHAR('q')
	PORT_BIT(0x20, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_O)     PORT_CHAR('O') PORT_CHAR('o')
	PORT_BIT(0x40, IP_ACTIVE_LOW, IPT_UNUSED)

	PORT_START("KEY6")
	PORT_BIT(0x01, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_QUOTE) PORT_CHAR(':') PORT_CHAR('*')
	PORT_BIT(0x02, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_SLASH) PORT_CHAR('/') PORT_CHAR('?')
	PORT_BIT(0x04, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_0)     PORT_CHAR('0')
	PORT_BIT(0x08, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_2)     PORT_CHAR('2') PORT_CHAR('\"')
	PORT_BIT(0x10, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_1)     PORT_CHAR('1') PORT_CHAR('!')
	PORT_BIT(0x20, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_P)     PORT_CHAR('P') PORT_CHAR('p')
	PORT_BIT(0x40, IP_ACTIVE_LOW, IPT_UNUSED)

	PORT_START("KEY7")
	PORT_BIT(0x01, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_G)     PORT_CHAR('G') PORT_CHAR('g')
	PORT_BIT(0x02, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_V)     PORT_CHAR('V') PORT_CHAR('v')
	PORT_BIT(0x04, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_4)     PORT_CHAR('4') PORT_CHAR('$')
	PORT_BIT(0x08, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_C)     PORT_CHAR('C') PORT_CHAR('c')
	PORT_BIT(0x10, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_SPACE) PORT_CHAR(' ')
	PORT_BIT(0x20, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_R)     PORT_CHAR('R') PORT_CHAR('r')
	PORT_BIT(0x40, IP_ACTIVE_LOW, IPT_UNUSED)

	PORT_START("KEY8")
	PORT_BIT(0x01, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("Backspace ClearScreen") PORT_CODE(KEYCODE_CLOSEBRACE) PORT_CHAR(8)
	PORT_BIT(0x02, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("New Line")              PORT_CODE(KEYCODE_ENTER)      PORT_CHAR(13)
	PORT_BIT(0x04, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_MINUS) PORT_CHAR('-') PORT_CHAR('=')
	PORT_BIT(0x58, IP_ACTIVE_LOW, IPT_UNUSED)
	PORT_BIT(0x20, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_OPENBRACE)  PORT_CHAR(UCHAR_SHIFT_2) PORT_CHAR('@')
INPUT_PORTS_END

static INPUT_PORTS_START( nascom2 )
	PORT_INCLUDE(nascom1)

	PORT_MODIFY("KEY6")
	PORT_BIT(0x40, IP_ACTIVE_LOW, IPT_KEYBOARD)                            PORT_CODE(KEYCODE_EQUALS)     PORT_CHAR('[') PORT_CHAR('\\')

	PORT_MODIFY("KEY7")
	PORT_BIT(0x40, IP_ACTIVE_LOW, IPT_KEYBOARD)                            PORT_CODE(KEYCODE_BACKSPACE)  PORT_CHAR(']') PORT_CHAR('_')

	PORT_MODIFY("KEY8")
	PORT_BIT(0x01, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("Back CS")       PORT_CODE(KEYCODE_CLOSEBRACE) PORT_CHAR(8)
	PORT_BIT(0x02, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("Enter  Escape") PORT_CODE(KEYCODE_ENTER)      PORT_CHAR(13)  PORT_CHAR(27)
INPUT_PORTS_END


/*************************************
 *
 *  Machine drivers
 *
 *************************************/

static const ay31015_config nascom1_ay31015_config =
{
	( XTAL_16MHz / 16 ) / 256,
	( XTAL_16MHz / 16 ) / 256,
	DEVCB_DRIVER_MEMBER(nascom1_state, nascom1_hd6402_si),
	DEVCB_DRIVER_MEMBER(nascom1_state, nascom1_hd6402_so),
	DEVCB_NULL
};


static Z80PIO_INTERFACE( nascom1_z80pio_intf )
{
	DEVCB_NULL,
	DEVCB_NULL,
	DEVCB_NULL,
	DEVCB_NULL,
	DEVCB_NULL,
	DEVCB_NULL,
	DEVCB_NULL
};


static MACHINE_CONFIG_START( nascom1, nascom1_state )
	/* basic machine hardware */
	MCFG_CPU_ADD("maincpu", Z80, XTAL_16MHz/8)
	MCFG_CPU_PROGRAM_MAP(nascom1_mem)
	MCFG_CPU_IO_MAP(nascom1_io)


	/* 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(48 * 8, 16 * 16)
	MCFG_SCREEN_VISIBLE_AREA(0, 48 * 8 - 1, 0, 16 * 16 - 1)
	MCFG_SCREEN_UPDATE_DRIVER(nascom1_state, screen_update_nascom1)
	MCFG_SCREEN_PALETTE("palette")

	MCFG_GFXDECODE_ADD("gfxdecode", "palette", nascom1)
	MCFG_PALETTE_ADD_BLACK_AND_WHITE("palette")

	MCFG_AY31015_ADD( "hd6402", nascom1_ay31015_config )

	MCFG_Z80PIO_ADD( "z80pio", XTAL_16MHz/8, nascom1_z80pio_intf )

	/* devices */
	MCFG_SNAPSHOT_ADD("snapshot", nascom1_state, nascom1, "nas", 0.5)

	MCFG_CASSETTE_ADD( "cassette", default_cassette_interface )

	/* internal ram */
	MCFG_RAM_ADD(RAM_TAG)
	MCFG_RAM_DEFAULT_SIZE("40K")
	MCFG_RAM_EXTRA_OPTIONS("1K,16K,32K")
MACHINE_CONFIG_END

static LEGACY_FLOPPY_OPTIONS_START(nascom2)
	LEGACY_FLOPPY_OPTION(nascom2_ss, "dsk", "Nascom 2 SS disk image", basicdsk_identify_default, basicdsk_construct_default, NULL,
		HEADS([1])
		TRACKS([80])
		SECTORS([16])
		SECTOR_LENGTH([256])
		FIRST_SECTOR_ID([1]))
	LEGACY_FLOPPY_OPTION(nascom2_ds, "dsk", "Nascom 2 DS disk image", basicdsk_identify_default, basicdsk_construct_default, NULL,
		HEADS([2])
		TRACKS([80])
		SECTORS([16])
		SECTOR_LENGTH([256])
		FIRST_SECTOR_ID([1]))
LEGACY_FLOPPY_OPTIONS_END

static const floppy_interface nascom2_floppy_interface =
{
	DEVCB_NULL,
	DEVCB_NULL,
	DEVCB_NULL,
	DEVCB_NULL,
	DEVCB_NULL,
	FLOPPY_STANDARD_5_25_DSHD,
	LEGACY_FLOPPY_OPTIONS_NAME(nascom2),
	NULL,
	NULL
};

static MACHINE_CONFIG_DERIVED( nascom2, nascom1 )
	MCFG_CPU_MODIFY("maincpu")
	MCFG_CPU_IO_MAP(nascom2_io)

	/* video hardware */
	MCFG_SCREEN_MODIFY("screen")
	MCFG_SCREEN_SIZE(48 * 8, 16 * 14)
	MCFG_SCREEN_VISIBLE_AREA(0, 48 * 8 - 1, 0, 16 * 14 - 1)
	MCFG_SCREEN_UPDATE_DRIVER(nascom1_state, screen_update_nascom2)

	MCFG_GFXDECODE_MODIFY("gfxdecode", nascom2)

	MCFG_FD1793_ADD("wd1793", nascom2_wd17xx_interface )

	MCFG_LEGACY_FLOPPY_4_DRIVES_ADD(nascom2_floppy_interface)
MACHINE_CONFIG_END



/*************************************
 *
 *  ROM definitions
 *
 *************************************/

ROM_START(nascom1)
	ROM_REGION(0x10000, "maincpu",0)
	ROM_SYSTEM_BIOS(0, "T4", "NasBug T4")
	ROMX_LOAD("nasbugt4.rom", 0x0000, 0x0800, CRC(f391df68) SHA1(00218652927afc6360c57e77d6a4fd32d4e34566), ROM_BIOS(1))
	ROM_SYSTEM_BIOS(1, "T1", "NasBug T1")
	ROMX_LOAD("nasbugt1.rom", 0x0000, 0x0400, CRC(8ea07054) SHA1(3f9a8632826003d6ea59d2418674d0fb09b83a4c), ROM_BIOS(2))
	ROM_SYSTEM_BIOS(2, "T2", "NasBug T2")
	ROMX_LOAD("nasbugt2.rom", 0x0000, 0x0400, CRC(e371b58a) SHA1(485b20a560b587cf9bb4208ba203b12b3841689b), ROM_BIOS(3))
	ROM_REGION(0x0800, "gfx1", 0)
	ROM_LOAD("nascom1.chr",   0x0000, 0x0800, CRC(33e92a04) SHA1(be6e1cc80e7f95a032759f7df19a43c27ff93a52))
ROM_END


ROM_START(nascom2)
	ROM_REGION(0x10000, "maincpu",0)
	ROM_SYSTEM_BIOS( 0, "NS3", "NasSys 3")
	ROMX_LOAD("nassys3.rom", 0x0000, 0x0800, CRC(3da17373) SHA1(5fbda15765f04e4cd08cf95c8d82ce217889f240), ROM_BIOS(1))
	ROM_SYSTEM_BIOS( 1, "NS1", "NasSys 1")
	ROMX_LOAD("nassys1.rom", 0x0000, 0x0800, CRC(b6300716) SHA1(29da7d462ba3f569f70ed3ecd93b981f81c7adfa), ROM_BIOS(2))
	ROM_LOAD("nasdos.rom",   0xd000, 0x1000, CRC(54a36f6d) SHA1(1d063d04be5024f128bd589e6edc066e9a63fc1b))
	ROM_LOAD("basic.rom",    0xe000, 0x2000, CRC(5cb5197b) SHA1(c41669c2b6d6dea808741a2738426d97bccc9b07))
	ROM_REGION(0x1000, "gfx1", 0)
	ROM_LOAD("nascom1.chr",  0x0000, 0x0800, CRC(33e92a04) SHA1(be6e1cc80e7f95a032759f7df19a43c27ff93a52))
	ROM_LOAD("nasgra.chr",   0x0800, 0x0800, CRC(2bc09d32) SHA1(d384297e9b02cbcb283c020da51b3032ff62b1ae))
ROM_END


/*************************************
 *
 *  Driver definitions
 *
 *************************************/

/*    YEAR  NAME        PARENT      COMPAT  MACHINE     INPUT       INIT       COMPANY                     FULLNAME        FLAGS */
COMP( 1978, nascom1,    0,          0,      nascom1,    nascom1, nascom1_state,    nascom1,   "Nascom Microcomputers",    "Nascom 1",     GAME_NO_SOUND )
COMP( 1979, nascom2,    nascom1,    0,      nascom2,    nascom2, nascom1_state,    nascom1,   "Nascom Microcomputers",    "Nascom 2",     GAME_NO_SOUND )