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r8754 Tuesday 10th August, 2010 at 13:16:56 UTC by Angelo Salese
[PC6600]: Fixed CGROM bankswitch and worked around the Disk access, now this version boots too
[src/mess/drivers]pc6001.c

src/mess/drivers/pc6001.c
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22
33    PC-6001 series (c) 1981 NEC
44
5    preliminary driver by Angelo Salese
5    driver by Angelo Salese
66
77    TODO:
88    - Hook up tape loading, images that are floating around the net are already
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1010    - cassette handling requires a decap of the MCU. It could be possible to
1111      do some tight synch between the master CPU and a code simulation,but I think
1212      it's not worth the effort...
13    - make PC-6600 model to work;
13    - Identify and hook-up the FDC device, apparently PC-6001 and PC-6600 doesn't even use the same thing;
14    - PC-6600: mon r-0 type games doesn't seem to work at all on this version?
1415    - Currently rewriting the video part without the MC6847 for two reasons:
1516        A) the later models have a custom video chip in the place of the MC6847,
1617           so this implementation will be used in the end.
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3132                                                 doesn't seem to work too well with halt opcode execution?
3233   - Dezeni Land 1/4: dies after loading of main program
3334   - Dezeni Land 2: dies at the "load something" screen with presumably wrong stack opcodes
34   - Forts 1: refuses to run, bad dump?
35   - Forts 2: ASCII gfxs are missing;
35   - (MyCom BASIC games with multiple files): most of them refuses to run ... how to load them?
3636   - Grobda: when "get ready" speech plays, screen should be full white but instead it's all black, same issue as AX-6 Demo?
3737   - Pac-Man / Tiny Xevious 2: gameplay is too fast
3838   - Salad no Kunino Tomato-Hime: can't start a play
3939   - Space Harrier: inputs doesn't work properly
40   - The Black Onyx: dies because it wants to save on the tape
41   - Yakyukyo: waits for an irq, check which one;
40   - The Black Onyx: dies when it attempts to save the character, that obviously means saving on the tape
41   - Yakyukyo / Punchball Mario: waits for an irq, check which one;
4242
4343========================================================================================================================================================
4444
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145145static UINT8 ex_vram_bank, bgcol_bank,exgfx_text_mode,exgfx_bitmap_mode,exgfx_2bpp_mode;
146146static UINT8 bank_r0,bank_r1,gfx_bank_on,bank_w,bank_opt;
147147static UINT8 timer_irq_mask2, timer_irq_vector;
148static UINT32 cgrom_bank_addr;
148149
149//#define CAS_LENGTH 0x1655
150#define IRQ_LOG (0)
150151
151152static VIDEO_START( pc6001 )
152153{
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849850   if(!gfx_bank_on)
850851      memory_set_bankptr(space->machine, "bank4", &ROM[banksw_table_r0[((bank_r0 & 0xf0)>>4)+(bank_opt*0x10)][3]]);
851852   else
852      memory_set_bankptr(space->machine, "bank4", &gfx_data[0x2000]); //FIXME: check this (CGROM 1/2?)
853      memory_set_bankptr(space->machine, "bank4", &gfx_data[cgrom_bank_addr]);
853854}
854855
855856static WRITE8_HANDLER( pc6001m2_bank_r1_w )
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892893   if(!gfx_bank_on)
893894      memory_set_bankptr(space->machine, "bank4", &ROM[banksw_table_r0[((bank_r0 & 0xf0)>>4)+(bank_opt*0x10)][3]]);
894895   else
895      memory_set_bankptr(space->machine, "bank4", &gfx_data[0x2000]); //FIXME: check this (CGROM 1/2?)
896      memory_set_bankptr(space->machine, "bank4", &gfx_data[cgrom_bank_addr]);
896897   memory_set_bankptr(space->machine, "bank4", &ROM[banksw_table_r0[((bank_r0 & 0xf0)>>4)+(bank_opt*0x10)][3]]);
897898   memory_set_bankptr(space->machine, "bank5", &ROM[banksw_table_r1[(bank_r1 & 0xf)+(bank_opt*0x10)][0]]);
898899   memory_set_bankptr(space->machine, "bank6", &ROM[banksw_table_r1[(bank_r1 & 0xf)+(bank_opt*0x10)][1]]);
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943944         if((data & 0x0f) == 0x04)
944945         {
945946            gfx_bank_on = 1;
946            memory_set_bankptr(device->machine, "bank4", &gfx_data[0x2000]); //FIXME: check this (CGROM 1/2?)
947            memory_set_bankptr(device->machine, "bank4", &gfx_data[cgrom_bank_addr]);
947948         }
948949      }
949950   }
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995996   }
996997
997998   sys_latch = data;
999
9981000   timer_irq_mask = data & 1;
9991001   vram_bank_change(space->machine,(ex_vram_bank & 0x06) | ((sys_latch & 0x06) << 4));
10001002
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10101012   vram_bank_change(space->machine,(ex_vram_bank & 0x06) | ((sys_latch & 0x06) << 4));
10111013
10121014   exgfx_text_mode = ((data & 2) == 0);
1015   cgrom_bank_addr = (data & 2) ? 0x0000 : 0x2000;
10131016
10141017   exgfx_bitmap_mode = (data & 8);
10151018   exgfx_2bpp_mode = ((data & 6) == 0);
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10981101{
10991102   if(cas_switch == 0 && ((timer_irq_mask == 0) || (timer_irq_mask2 == 0)))
11001103   {
1104      if(IRQ_LOG) printf("Timer IRQ called %02x\n",timer_irq_vector);
11011105      irq_vector = timer_irq_vector;
11021106      cputag_set_input_line(machine,"maincpu", 0, ASSERT_LINE);
11031107   }
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11311135   return bank_w;
11321136}
11331137
1134
11351138static ADDRESS_MAP_START(pc6001m2_map, ADDRESS_SPACE_PROGRAM, 8)
11361139   ADDRESS_MAP_UNMAP_HIGH
11371140   AM_RANGE(0x0000, 0x1fff) AM_ROMBANK("bank1") AM_WRITE(work_ram0_w)
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11671170
11681171   AM_RANGE(0xe0, 0xe3) AM_MIRROR(0x0c) AM_READWRITE(upd7752_reg_r,upd7752_reg_w)
11691172
1170   AM_RANGE(0xf0, 0xf0) AM_READ(pc6001m2_bank_r0_r) AM_WRITE(pc6001m2_bank_r0_w)
1171   AM_RANGE(0xf1, 0xf1) AM_READ(pc6001m2_bank_r1_r) AM_WRITE(pc6001m2_bank_r1_w)
1172   AM_RANGE(0xf2, 0xf2) AM_READ(pc6001m2_bank_w0_r) AM_WRITE(pc6001m2_bank_w0_w)
1173   AM_RANGE(0xf0, 0xf0) AM_READWRITE(pc6001m2_bank_r0_r,pc6001m2_bank_r0_w)
1174   AM_RANGE(0xf1, 0xf1) AM_READWRITE(pc6001m2_bank_r1_r,pc6001m2_bank_r1_w)
1175   AM_RANGE(0xf2, 0xf2) AM_READWRITE(pc6001m2_bank_w0_r,pc6001m2_bank_w0_w)
11731176   AM_RANGE(0xf3, 0xf3) AM_WRITE(pc6001m2_0xf3_w)
11741177//   AM_RANGE(0xf4
11751178//   AM_RANGE(0xf5
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11771180   AM_RANGE(0xf7, 0xf7) AM_WRITE(pc6001m2_timer_irqv_w)
11781181ADDRESS_MAP_END
11791182
1183/* disk device placeholder (TODO: identify & hook-up this) */
1184static READ8_HANDLER( pc6600_fdc_r )
1185{
1186   return mame_rand(space->machine);
1187}
1188
1189static WRITE8_HANDLER( pc6600_fdc_w )
1190{
1191}
1192
1193
1194static ADDRESS_MAP_START( pc6600_io , ADDRESS_SPACE_IO, 8)
1195   ADDRESS_MAP_UNMAP_HIGH
1196   ADDRESS_MAP_GLOBAL_MASK(0xff)
1197   AM_RANGE(0x80, 0x80) AM_DEVREADWRITE("uart", msm8251_data_r,msm8251_data_w)
1198   AM_RANGE(0x81, 0x81) AM_DEVREADWRITE("uart", msm8251_status_r,msm8251_control_w)
1199
1200   AM_RANGE(0x90, 0x93) AM_MIRROR(0x0c) AM_DEVREADWRITE("ppi8255", nec_ppi8255_r, necmk2_ppi8255_w)
1201
1202   AM_RANGE(0xa0, 0xa0) AM_MIRROR(0x0c) AM_DEVWRITE("ay8910", ay8910_address_w)
1203   AM_RANGE(0xa1, 0xa1) AM_MIRROR(0x0c) AM_DEVWRITE("ay8910", ay8910_data_w)
1204   AM_RANGE(0xa2, 0xa2) AM_MIRROR(0x0c) AM_DEVREAD("ay8910", ay8910_r)
1205   AM_RANGE(0xa3, 0xa3) AM_MIRROR(0x0c) AM_NOP
1206
1207   AM_RANGE(0xb0, 0xb0) AM_WRITE(pc6001m2_system_latch_w)
1208   /* these are disk related */
1209//   AM_RANGE(0xb1
1210//   AM_RANGE(0xb2
1211//   AM_RANGE(0xb3
1212
1213   AM_RANGE(0xc0, 0xc0) AM_WRITE(pc6001m2_col_bank_w)
1214   AM_RANGE(0xc1, 0xc1) AM_WRITE(pc6001m2_vram_bank_w)
1215   AM_RANGE(0xc2, 0xc2) AM_WRITE(pc6001m2_opt_bank_w)
1216
1217   AM_RANGE(0xd0, 0xdf) AM_READWRITE(pc6600_fdc_r,pc6600_fdc_w) // disk device
1218
1219   AM_RANGE(0xe0, 0xe3) AM_MIRROR(0x0c) AM_READWRITE(upd7752_reg_r,upd7752_reg_w)
1220
1221   AM_RANGE(0xf0, 0xf0) AM_READWRITE(pc6001m2_bank_r0_r,pc6001m2_bank_r0_w)
1222   AM_RANGE(0xf1, 0xf1) AM_READWRITE(pc6001m2_bank_r1_r,pc6001m2_bank_r1_w)
1223   AM_RANGE(0xf2, 0xf2) AM_READWRITE(pc6001m2_bank_w0_r,pc6001m2_bank_w0_w)
1224   AM_RANGE(0xf3, 0xf3) AM_WRITE(pc6001m2_0xf3_w)
1225//   AM_RANGE(0xf4
1226//   AM_RANGE(0xf5
1227   AM_RANGE(0xf6, 0xf6) AM_WRITE(pc6001m2_timer_adj_w)
1228   AM_RANGE(0xf7, 0xf7) AM_WRITE(pc6001m2_timer_irqv_w)
1229ADDRESS_MAP_END
1230
11801231/* Input ports */
11811232static INPUT_PORTS_START( pc6001 )
11821233   PORT_START("MODE4_DSW") //TODO: is this really a DSW? bit arrangement is also unknown if so.
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13191370   PORT_BIT(0x00000004,IP_ACTIVE_HIGH,IPT_KEYBOARD) PORT_NAME("KANA") PORT_CODE(KEYCODE_RCONTROL) PORT_TOGGLE
13201371   PORT_BIT(0x00000008,IP_ACTIVE_HIGH,IPT_KEYBOARD) PORT_NAME("CAPS") PORT_CODE(KEYCODE_CAPSLOCK) PORT_TOGGLE
13211372   PORT_BIT(0x00000010,IP_ACTIVE_HIGH,IPT_KEYBOARD) PORT_NAME("GRPH") PORT_CODE(KEYCODE_LALT)
1373   PORT_BIT(0x00000020,IP_ACTIVE_HIGH,IPT_KEYBOARD) PORT_NAME("STOP") PORT_CODE(KEYCODE_ESC)
13221374INPUT_PORTS_END
13231375
13241376static UINT8 check_joy_press(running_machine *machine);
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13261378static INTERRUPT_GEN( pc6001_interrupt )
13271379{
13281380   cur_keycode = check_joy_press(device->machine);
1381   if(IRQ_LOG) printf("Stick IRQ called 0x16\n");
13291382   irq_vector = 0x16;
13301383   cpu_set_input_line(device, 0, ASSERT_LINE);
13311384}
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14401493static UINT8 check_joy_press(running_machine *machine)
14411494{
14421495   UINT8 p1_key = input_port_read(machine,"P1") ^ 0xff;
1496   UINT8 shift_key = input_port_read(machine,"key_modifiers") & 0x02;
1497   UINT8 space_key = input_port_read(machine,"key2") & 0x01;
1498
14431499   static UINT8 joy_press;
14441500
14451501      /*
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14671523      case 0x0a: joy_press = 0x18; break; //down-right
14681524   }
14691525
1470   if(p1_key & 0x10) { joy_press |= 0x80; } //button 1 (space?)
1471   if(p1_key & 0x20) { joy_press |= 0x01; } //button 2 (shift)
1526   if(p1_key & 0x10 || space_key) { joy_press |= 0x80; } //button 1 (space)
1527   if(p1_key & 0x20 || shift_key) { joy_press |= 0x01; } //button 2 (shift)
14721528
14731529   return joy_press;
14741530}
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15031559         {
15041560            cas_offset = 0;
15051561            cas_switch = 0;
1562            if(IRQ_LOG) printf("Tape-E IRQ 0x12\n");
15061563            irq_vector = 0x12;
15071564            cputag_set_input_line(machine,"maincpu", 0, ASSERT_LINE);
15081565         }
15091566         else
15101567         {
1568            if(IRQ_LOG) printf("Tape-D IRQ 0x08\n");
15111569            irq_vector = 0x08;
15121570            cputag_set_input_line(machine,"maincpu", 0, ASSERT_LINE);
15131571         }
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15291587      if((key1 != old_key1) || (key2 != old_key2) || (key3 != old_key3))
15301588      {
15311589         cur_keycode = check_keyboard_press(space->machine);
1590         if(IRQ_LOG) printf("KEY IRQ 0x02\n");
15321591         irq_vector = 0x02;
15331592         cputag_set_input_line(machine,"maincpu", 0, ASSERT_LINE);
15341593         old_key1 = key1;
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15961655   /* set default bankswitch */
15971656   {
15981657      UINT8 *ROM = memory_region(machine, "maincpu");
1599      bank_r0 = 0x01;
1658      bank_r0 = 0x71;
16001659      memory_set_bankptr(machine, "bank1", &ROM[BASICROM(0)]);
16011660      memory_set_bankptr(machine, "bank2", &ROM[BASICROM(1)]);
1602      memory_set_bankptr(machine, "bank3", &ROM[INVALID(0)]);
1603      memory_set_bankptr(machine, "bank4", &ROM[INVALID(0)]);
1661      memory_set_bankptr(machine, "bank3", &ROM[EXROM(0)]);
1662      memory_set_bankptr(machine, "bank4", &ROM[EXROM(1)]);
16041663      bank_r1 = 0xdd;
16051664      memory_set_bankptr(machine, "bank5", &ROM[WRAM(4)]);
16061665      memory_set_bankptr(machine, "bank6", &ROM[WRAM(5)]);
16071666      memory_set_bankptr(machine, "bank7", &ROM[WRAM(6)]);
16081667      memory_set_bankptr(machine, "bank8", &ROM[WRAM(7)]);
16091668      bank_opt = 0x02; //tv rom
1610      bank_w = 0x55; //write to work ram
1669      bank_w = 0x50; //enable write to work ram 4,5,6,7
16111670      gfx_bank_on = 0;
16121671   }
16131672
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17381797   MDRV_CPU_VBLANK_INT("screen", pc6001_interrupt)
17391798
17401799//  MDRV_CPU_ADD("subcpu", I8049, 7987200)
1800
17411801   MDRV_MACHINE_START(pc6001)
17421802   MDRV_MACHINE_RESET(pc6001)
17431803
17441804   MDRV_GFXDECODE(pc6001m2)
17451805
1746
17471806   /* video hardware */
17481807   MDRV_SCREEN_ADD("screen", RASTER)
17491808   MDRV_SCREEN_REFRESH_RATE(60)
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18011860
18021861MACHINE_DRIVER_END
18031862
1804static MACHINE_DRIVER_START( pc6001sr )
1863static MACHINE_DRIVER_START( pc6600 )
18051864   MDRV_IMPORT_FROM(pc6001m2)
18061865
18071866   /* basic machine hardware */
1808   MDRV_CPU_REPLACE("maincpu", Z80, XTAL_3_579545MHz) //*Yes*, PC-6001 SR Z80 CPU is actually slower than older models
1867   MDRV_CPU_REPLACE("maincpu", Z80, XTAL_3_579545MHz) //*Yes*, PC-6600 Z80 CPU is actually slower than older models
1868   MDRV_CPU_PROGRAM_MAP(pc6001m2_map)
1869   MDRV_CPU_IO_MAP(pc6600_io)
1870   MDRV_CPU_VBLANK_INT("screen", pc6001_interrupt)
18091871MACHINE_DRIVER_END
18101872
18111873/* ROM definition */
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18231885   ROM_REGION( 0x20000, "cas", ROMREGION_ERASEFF )
18241886
18251887   ROM_REGION( 0x4000, "cart_img", ROMREGION_ERASE00 )
1826   ROM_CART_LOAD("cart", 0x0000, 0x3fff, ROM_OPTIONAL | ROM_MIRROR)
1888   ROM_CART_LOAD("cart", 0x0000, 0x4000, ROM_OPTIONAL | ROM_MIRROR)
18271889ROM_END
18281890
18291891ROM_START( pc6001a )
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18411903   ROM_REGION( 0x20000, "cas", ROMREGION_ERASEFF )
18421904
18431905   ROM_REGION( 0x4000, "cart_img", ROMREGION_ERASE00 )
1844   ROM_CART_LOAD("cart", 0x0000, 0x3fff, ROM_OPTIONAL | ROM_MIRROR)
1906   ROM_CART_LOAD("cart", 0x0000, 0x4000, ROM_OPTIONAL | ROM_MIRROR)
18451907ROM_END
18461908
18471909ROM_START( pc6001m2 )
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18711933   ROM_COPY( "maincpu", 0x48000, 0x0000, 0x4000 )
18721934ROM_END
18731935
1874ROM_START( pc6600 )   /* Variant of pc6001m2 */
1875   ROM_REGION( 0x48000, "maincpu", ROMREGION_ERASEFF )
1876   ROM_LOAD( "basicrom.66", 0x10000, 0x8000, CRC(c0b01772) SHA1(9240bb6b97fe06f5f07b5d65541c4d2f8758cc2a) )
1877   ROM_LOAD( "voicerom.66", 0x18000, 0x4000, CRC(91d078c1) SHA1(6a93bd7723ef67f461394530a9feee57c8caf7b7) )
1878   ROM_LOAD( "cgrom60.66",  0x1c000, 0x2000, CRC(d2434f29) SHA1(a56d76f5cbdbcdb8759abe601eab68f01b0a8fe8) )
1879   ROM_LOAD( "cgrom66.66",  0x1e000, 0x2000, CRC(3ce48c33) SHA1(f3b6c63e83a17d80dde63c6e4d86adbc26f84f79) )
1880   ROM_LOAD( "kanjirom.66", 0x20000, 0x8000, CRC(20c8f3eb) SHA1(4c9f30f0a2ebbe70aa8e697f94eac74d8241cadd) )
1936ROM_START( pc6001sr )
1937   ROM_REGION( 0x50000, "maincpu", ROMREGION_ERASEFF )
1938   /* If you split this into 4x 8000, the first 3 need to load to 0-7FFF (via bankswitch). The 4th part looks like gfx data */
1939   ROM_LOAD( "systemrom1.64", 0x10000, 0x10000, CRC(b6fc2db2) SHA1(dd48b1eee60aa34780f153359f5da7f590f8dff4) )
1940   ROM_LOAD( "systemrom2.64", 0x20000, 0x10000, CRC(55a62a1d) SHA1(3a19855d290fd4ac04e6066fe4a80ecd81dc8dd7) )
1941   ROM_CART_LOAD("cart",    0x48000, 0x4000, ROM_OPTIONAL | ROM_MIRROR)
18811942
18821943   ROM_REGION( 0x1000, "mcu", ROMREGION_ERASEFF )
18831944   ROM_LOAD( "i8049", 0x0000, 0x1000, NO_DUMP )
18841945
18851946   ROM_REGION( 0x4000, "gfx1", 0 )
1886   ROM_COPY( "maincpu", 0x1c000, 0x00000, 0x4000 )
1947   ROM_LOAD( "cgrom68.64", 0x0000, 0x4000, CRC(73bc3256) SHA1(5f80d62a95331dc39b2fb448a380fd10083947eb) )
18871948
1888   ROM_REGION( 0x8000, "gfx2", 0 )
1889   ROM_COPY( "maincpu", 0x20000, 0x00000, 0x8000 )
1949   ROM_REGION( 0x8000, "gfx2", ROMREGION_ERASEFF )
18901950
18911951   ROM_REGION( 0x20000, "cas", ROMREGION_ERASEFF )
18921952
18931953   ROM_REGION( 0x4000, "cart_img", ROMREGION_ERASE00 )
1894   ROM_CART_LOAD("cart", 0x0000, 0x3fff, ROM_OPTIONAL | ROM_MIRROR)
1954   ROM_COPY( "maincpu", 0x48000, 0x0000, 0x4000 )
18951955ROM_END
18961956
1897ROM_START( pc6001sr )
1898   ROM_REGION( 0x20000, "maincpu", ROMREGION_ERASEFF )
1899   /* If you split this into 4x 8000, the first 3 need to load to 0-7FFF (via bankswitch). The 4th part looks like gfx data */
1900   ROM_LOAD( "systemrom1.64", 0x0000, 0x10000, CRC(b6fc2db2) SHA1(dd48b1eee60aa34780f153359f5da7f590f8dff4) )
1901   ROM_LOAD( "systemrom2.64", 0x10000, 0x10000, CRC(55a62a1d) SHA1(3a19855d290fd4ac04e6066fe4a80ecd81dc8dd7) )
19021957
1958ROM_START( pc6600 )   /* Variant of pc6001m2 */
1959   ROM_REGION( 0x50000, "maincpu", ROMREGION_ERASEFF )
1960   ROM_LOAD( "basicrom.66", 0x10000, 0x8000, CRC(c0b01772) SHA1(9240bb6b97fe06f5f07b5d65541c4d2f8758cc2a) )
1961   ROM_LOAD( "voicerom.66", 0x18000, 0x4000, CRC(91d078c1) SHA1(6a93bd7723ef67f461394530a9feee57c8caf7b7) )
1962   ROM_LOAD( "cgrom60.66",  0x1c000, 0x2000, CRC(d2434f29) SHA1(a56d76f5cbdbcdb8759abe601eab68f01b0a8fe8) )
1963   ROM_LOAD( "cgrom66.66",  0x1e000, 0x2000, CRC(3ce48c33) SHA1(f3b6c63e83a17d80dde63c6e4d86adbc26f84f79) )
1964   ROM_LOAD( "kanjirom.66", 0x20000, 0x8000, CRC(20c8f3eb) SHA1(4c9f30f0a2ebbe70aa8e697f94eac74d8241cadd) )
1965   ROM_CART_LOAD("cart",    0x48000, 0x4000, ROM_OPTIONAL | ROM_MIRROR)
1966
19031967   ROM_REGION( 0x1000, "mcu", ROMREGION_ERASEFF )
19041968   ROM_LOAD( "i8049", 0x0000, 0x1000, NO_DUMP )
19051969
19061970   ROM_REGION( 0x4000, "gfx1", 0 )
1907   ROM_LOAD( "cgrom68.64", 0x0000, 0x4000, CRC(73bc3256) SHA1(5f80d62a95331dc39b2fb448a380fd10083947eb) )
1971   ROM_COPY( "maincpu", 0x1c000, 0x00000, 0x4000 )
19081972
1909   ROM_REGION( 0x8000, "gfx2", ROMREGION_ERASEFF )
1973   ROM_REGION( 0x8000, "gfx2", 0 )
1974   ROM_COPY( "maincpu", 0x20000, 0x00000, 0x8000 )
19101975
19111976   ROM_REGION( 0x20000, "cas", ROMREGION_ERASEFF )
19121977
19131978   ROM_REGION( 0x4000, "cart_img", ROMREGION_ERASE00 )
1914   ROM_CART_LOAD("cart", 0x0000, 0x3fff, ROM_OPTIONAL | ROM_MIRROR)
1979   ROM_COPY( "maincpu", 0x48000, 0x0000, 0x4000 )
19151980ROM_END
19161981
19171982/* There exists an alternative (incomplete?) dump, consisting of more .68 pieces, but it's been probably created for emulators:
r8753r8754
19201985cgrom68.68 = CGROM60.68 + CGROM66.68
19211986 */
19221987ROM_START( pc6600sr )   /* Variant of pc6001sr */
1923   ROM_REGION( 0x20000, "maincpu", ROMREGION_ERASEFF )
1988   ROM_REGION( 0x50000, "maincpu", ROMREGION_ERASEFF )
19241989   ROM_LOAD( "systemrom1.68", 0x0000, 0x10000, CRC(b6fc2db2) SHA1(dd48b1eee60aa34780f153359f5da7f590f8dff4) )
19251990   ROM_LOAD( "systemrom2.68", 0x10000, 0x10000, CRC(55a62a1d) SHA1(3a19855d290fd4ac04e6066fe4a80ecd81dc8dd7) )
19261991
r8753r8754
19331998   ROM_REGION( 0x20000, "cas", ROMREGION_ERASEFF )
19341999
19352000   ROM_REGION( 0x4000, "cart_img", ROMREGION_ERASE00 )
1936   ROM_CART_LOAD("cart", 0x0000, 0x3fff, ROM_OPTIONAL | ROM_MIRROR)
2001   ROM_CART_LOAD("cart", 0x0000, 0x4000, ROM_OPTIONAL | ROM_MIRROR)
19372002ROM_END
19382003
19392004/*    YEAR  NAME      PARENT   COMPAT MACHINE   INPUT     INIT    COMPANY  FULLNAME          FLAGS */
1940COMP( 1981, pc6001,   0,       0,     pc6001,   pc6001,   0,      "Nippon Electronic Company",   "PC-6001",       GAME_NOT_WORKING )
1941COMP( 1981, pc6001a,  pc6001,  0,     pc6001,   pc6001,   0,      "Nippon Electronic Company",   "PC-6001A",      GAME_NOT_WORKING )   // US version of PC-6001
1942COMP( 1983, pc6001m2, pc6001,  0,     pc6001m2, pc6001,   0,      "Nippon Electronic Company",   "PC-6001mkII",   GAME_NOT_WORKING )
1943COMP( 1984, pc6001sr, pc6001,  0,     pc6001sr, pc6001,   0,      "Nippon Electronic Company",   "PC-6001mkIISR", GAME_NOT_WORKING )
1944COMP( 1983, pc6600,   pc6001,  0,     pc6001m2, pc6001,   0,      "Nippon Electronic Company",   "PC-6600",       GAME_NOT_WORKING )   // high-end version of PC-6001mkII
1945COMP( 1984, pc6600sr, pc6001,  0,     pc6001sr, pc6001,   0,      "Nippon Electronic Company",   "PC-6600SR",     GAME_NOT_WORKING )   // high-end version of PC-6001mkIISR
2005COMP( 1981, pc6001,   0,       0,     pc6001,   pc6001,   0,      "Nippon Electronic Company",   "PC-6001 (Japan)",    GAME_NOT_WORKING )
2006COMP( 1981, pc6001a,  pc6001,  0,     pc6001,   pc6001,   0,      "Nippon Electronic Company",   "PC-6001A (US)",      GAME_NOT_WORKING ) // This version is also known as the NEC Trek
2007COMP( 1983, pc6001m2, pc6001,  0,     pc6001m2, pc6001,   0,      "Nippon Electronic Company",   "PC-6001mkII (Japan)",   GAME_NOT_WORKING )
2008COMP( 1984, pc6001sr, pc6001,  0,     pc6001m2, pc6001,   0,      "Nippon Electronic Company",   "PC-6001mkIISR (Japan)", GAME_NOT_WORKING )
2009COMP( 1983, pc6600,   pc6001,  0,     pc6600,   pc6001,   0,      "Nippon Electronic Company",   "PC-6600 (Japan)",       GAME_NOT_WORKING )
2010COMP( 1984, pc6600sr, pc6001,  0,     pc6600,   pc6001,   0,      "Nippon Electronic Company",   "PC-6600SR (Japan)",     GAME_NOT_WORKING )

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