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r18966 Thursday 15th November, 2012 at 00:03:05 UTC by Angelo Salese
Added basic peripherals, kludged a weird DMA check, system puts [LOD] -> [LER] in VRAM, however the char ROM is busted so can't show anything :(
[src/mess/drivers]necapc.c*

trunk/src/mess/drivers/necapc.c
r0r18966
1/***************************************************************************
2
3   NEC APC
4
5   front ^
6         |
7   card
8   ----
9   69PFCU 7220               PFCU1R 2764
10   69PTS  7220
11   -
12   69PFB2 8086/8087   DFBU2J PFBU2L 2732
13   69SNB RAM
14
15   i/o memory map:
16   0x00 - 0x1f DMA
17   0x20 - 0x23 i8259 master
18   0x28 - 0x2b i8259 slave
19   0x2b / 0x2f / 0x61 / 0x6f pit8253 (!)
20   0x30 - 0x37 serial i8251, even #1 / odd #2
21   0x38 - 0x3f DMA segments
22   0x40 - 0x43 upd7220, even chr / odd bitmap
23   0x48 - 0x4f keyboard
24   0x50 - 0x53 upd765
25   0x58        rtc
26   0x5a - 0x5e APU
27   0x60        MPU (melody)
28   0x68 - 0x6f parallel port
29
30***************************************************************************/
31
32
33#include "emu.h"
34#include "cpu/i86/i86.h"
35#include "machine/pic8259.h"
36#include "machine/pit8253.h"
37#include "machine/8237dma.h"
38#include "machine/upd765.h"
39#include "video/upd7220.h"
40#include "imagedev/flopdrv.h"
41#include "formats/mfi_dsk.h"
42#include "formats/d88_dsk.h"
43//#include "sound/ay8910.h"
44
45class apc_state : public driver_device
46{
47public:
48   apc_state(const machine_config &mconfig, device_type type, const char *tag)
49      : driver_device(mconfig, type, tag),
50        m_maincpu(*this, "maincpu"),
51        m_hgdc1(*this, "upd7220_chr"),
52        m_hgdc2(*this, "upd7220_btm"),
53        m_i8259_m(*this, "pic8259_master"),
54        m_i8259_s(*this, "pic8259_slave")
55   { }
56
57   // devices
58   required_device<cpu_device> m_maincpu;
59   required_device<upd7220_device> m_hgdc1;
60   required_device<upd7220_device> m_hgdc2;
61   required_device<pic8259_device> m_i8259_m;
62   required_device<pic8259_device> m_i8259_s;
63   UINT8 *m_char_rom;
64
65   // screen updates
66   UINT32 screen_update(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect);
67
68
69   DECLARE_READ8_MEMBER(apc_port_28_r);
70   DECLARE_WRITE8_MEMBER(apc_port_28_w);
71   DECLARE_WRITE8_MEMBER(apc_port_2e_w);
72   DECLARE_READ8_MEMBER(apc_port_60_r);
73   DECLARE_WRITE8_MEMBER(apc_port_60_w);
74   DECLARE_READ8_MEMBER(apc_gdc_r);
75   DECLARE_WRITE8_MEMBER(apc_gdc_w);
76   DECLARE_READ8_MEMBER(apc_dma_r);
77   DECLARE_WRITE8_MEMBER(apc_dma_w);
78
79   DECLARE_WRITE_LINE_MEMBER(apc_master_set_int_line);
80   DECLARE_READ8_MEMBER(get_slave_ack);
81   DECLARE_WRITE_LINE_MEMBER(pc_dma_hrq_changed);
82   DECLARE_WRITE_LINE_MEMBER(pc_dack0_w);
83   DECLARE_WRITE_LINE_MEMBER(pc_dack1_w);
84   DECLARE_WRITE_LINE_MEMBER(pc_dack2_w);
85   DECLARE_WRITE_LINE_MEMBER(pc_dack3_w);
86   DECLARE_READ8_MEMBER(test_r);
87   DECLARE_WRITE8_MEMBER(test_w);
88   DECLARE_READ8_MEMBER(pc_dma_read_byte);
89   DECLARE_WRITE8_MEMBER(pc_dma_write_byte);
90
91   DECLARE_DRIVER_INIT(apc);
92
93   int m_dma_channel;
94   UINT8 m_dma_offset[2][4];
95   UINT8 m_at_pages[0x10];
96
97protected:
98   // driver_device overrides
99   virtual void machine_start();
100   virtual void machine_reset();
101
102   virtual void video_start();
103   virtual void palette_init();
104};
105
106void apc_state::video_start()
107{
108   m_char_rom = memregion("gfx")->base();
109}
110
111UINT32 apc_state::screen_update( screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect )
112{
113   bitmap.fill(0, cliprect);
114
115   /* graphics */
116   m_hgdc2->screen_update(screen, bitmap, cliprect);
117   m_hgdc1->screen_update(screen, bitmap, cliprect);
118
119   return 0;
120}
121
122
123static UPD7220_DISPLAY_PIXELS( hgdc_display_pixels )
124{
125   // ...
126}
127
128static UPD7220_DRAW_TEXT_LINE( hgdc_draw_text )
129{
130
131}
132
133READ8_MEMBER(apc_state::apc_port_28_r)
134{
135   UINT8 res;
136
137   if(offset & 1)
138   {
139      if(offset == 3)
140         res = pit8253_r(machine().device("pit8253"), space, 0);
141      else
142      {
143         printf("Read undefined port 0x29\n");
144         res = 0xff;
145      }
146   }
147   else
148   {
149      res = pic8259_r(machine().device("pic8259_slave"), space, (offset & 2) >> 1);
150   }
151
152   return res;
153}
154
155WRITE8_MEMBER(apc_state::apc_port_28_w)
156{
157   if(offset & 1)
158   {
159      if(offset == 3)
160         pit8253_w(machine().device("pit8253"), space, 0, data);
161      else
162      {
163         printf("Write undefined port 0x29\n");
164      }
165   }
166   else
167   {
168      pic8259_w(machine().device("pic8259_slave"), space, (offset & 2) >> 1, data);
169   }
170}
171
172WRITE8_MEMBER(apc_state::apc_port_2e_w)
173{
174   pit8253_w(machine().device("pit8253"), space, 1, data);
175}
176
177
178READ8_MEMBER(apc_state::apc_port_60_r)
179{
180   UINT8 res;
181
182   if(offset & 1)
183   {
184      if(offset == 1)
185         res = pit8253_r(machine().device("pit8253"), space, 2);
186      else
187      {
188         printf("Read undefined port %02x\n",offset+0x60);
189         res = 0xff;
190      }
191   }
192   else
193   {
194      printf("Read melody port %02x\n",offset+0x60);
195      res = 0xff;
196   }
197
198   return res;
199}
200
201WRITE8_MEMBER(apc_state::apc_port_60_w)
202{
203   if(offset & 1)
204   {
205      if(offset == 1)
206         pit8253_w(machine().device("pit8253"), space, 2, data);
207      else if(offset == 7)
208         pit8253_w(machine().device("pit8253"), space, 3, data);
209      else
210      {
211         printf("Write undefined port %02x\n",offset+0x60);
212      }
213   }
214   else
215   {
216      printf("Write melody port %02x\n",offset+0x60);
217   }
218}
219
220READ8_MEMBER(apc_state::apc_gdc_r)
221{
222   UINT8 res;
223
224   if(offset & 1)
225      res = m_hgdc2->read(space, (offset & 2) >> 1); // upd7220 bitmap port
226   else
227      res = m_hgdc1->read(space, (offset & 2) >> 1); // upd7220 character port
228
229   return res;
230}
231
232WRITE8_MEMBER(apc_state::apc_gdc_w)
233{
234   if(offset & 1)
235      m_hgdc2->write(space, (offset & 2) >> 1,data); // upd7220 bitmap port
236   else
237      m_hgdc1->write(space, (offset & 2) >> 1,data); // upd7220 character port
238}
239
240
241READ8_MEMBER(apc_state::apc_dma_r)
242{
243   return i8237_r(machine().device("8237dma"), space, offset & 0xf);
244}
245
246WRITE8_MEMBER(apc_state::apc_dma_w)
247{
248   //printf("%08x %02x\n",m_maincpu->pc(),data);
249   i8237_w(machine().device("8237dma"), space, offset & 0xf, data);
250}
251
252
253static ADDRESS_MAP_START( apc_map, AS_PROGRAM, 16, apc_state )
254   AM_RANGE(0x00000, 0x1ffff) AM_RAM
255//   AM_RANGE(0xa0000, 0xaffff) space for an external ROM
256   AM_RANGE(0xfe000, 0xfffff) AM_ROM AM_REGION("ipl", 0)
257ADDRESS_MAP_END
258
259static ADDRESS_MAP_START( apc_io, AS_IO, 16, apc_state )
260//  ADDRESS_MAP_GLOBAL_MASK(0xff)
261   AM_RANGE(0x00, 0x1f) AM_READWRITE8(apc_dma_r, apc_dma_w, 0x00ff)
262   AM_RANGE(0x20, 0x23) AM_DEVREADWRITE8_LEGACY("pic8259_master", pic8259_r, pic8259_w, 0x00ff) // i8259
263   AM_RANGE(0x28, 0x2b) AM_READWRITE8(apc_port_28_r, apc_port_28_w, 0xffff)
264   AM_RANGE(0x2e, 0x2f) AM_WRITE8(apc_port_2e_w, 0x00ff)
265//   0x2b RTC counter port 0
266//   0x2f RTC counter mode 0 (w)
267//   0x30, 0x37 serial port 0/1 (i8251) (even/odd)
268//   0x38, 0x3f DMA extended address
269   AM_RANGE(0x40, 0x43) AM_READWRITE8(apc_gdc_r, apc_gdc_w, 0xffff)
270//  0x46 UPD7220 reset interrupt
271//   0x48, 0x4f keyboard controller
272   AM_RANGE(0x50, 0x53) AM_DEVICE8("upd765", upd765a_device, map, 0x00ff ) // upd765
273//   0x5a  APU data (Arithmetic Processing Unit!)
274//   0x5e  APU status/command
275   AM_RANGE(0x60, 0x67) AM_READWRITE8(apc_port_60_r, apc_port_60_w, 0xffff)
276//   0x60 Melody Processing Unit
277//   0x61 RTC counter port 1
278//   0x67 RTC counter mode 1 (w)
279//   AM_RANGE(0x68, 0x6f) i8255 , printer port (A: status (R) B: data (W) C: command (W))
280//   AM_DEVREADWRITE8("upd7220_btm", upd7220_device, read, write, 0x00ff)
281ADDRESS_MAP_END
282
283static INPUT_PORTS_START( apc )
284   /* dummy active high structure */
285   PORT_START("SYSA")
286   PORT_DIPNAME( 0x01, 0x00, "SYSA" )
287   PORT_DIPSETTING(    0x00, DEF_STR( Off ) )
288   PORT_DIPSETTING(    0x01, DEF_STR( On ) )
289   PORT_DIPNAME( 0x02, 0x00, DEF_STR( Unknown ) )
290   PORT_DIPSETTING(    0x00, DEF_STR( Off ) )
291   PORT_DIPSETTING(    0x02, DEF_STR( On ) )
292   PORT_DIPNAME( 0x04, 0x00, DEF_STR( Unknown ) )
293   PORT_DIPSETTING(    0x00, DEF_STR( Off ) )
294   PORT_DIPSETTING(    0x04, DEF_STR( On ) )
295   PORT_DIPNAME( 0x08, 0x00, DEF_STR( Unknown ) )
296   PORT_DIPSETTING(    0x00, DEF_STR( Off ) )
297   PORT_DIPSETTING(    0x08, DEF_STR( On ) )
298   PORT_DIPNAME( 0x10, 0x00, DEF_STR( Unknown ) )
299   PORT_DIPSETTING(    0x00, DEF_STR( Off ) )
300   PORT_DIPSETTING(    0x10, DEF_STR( On ) )
301   PORT_DIPNAME( 0x20, 0x00, DEF_STR( Unknown ) )
302   PORT_DIPSETTING(    0x00, DEF_STR( Off ) )
303   PORT_DIPSETTING(    0x20, DEF_STR( On ) )
304   PORT_DIPNAME( 0x40, 0x00, DEF_STR( Unknown ) )
305   PORT_DIPSETTING(    0x00, DEF_STR( Off ) )
306   PORT_DIPSETTING(    0x40, DEF_STR( On ) )
307   PORT_DIPNAME( 0x80, 0x00, DEF_STR( Unknown ) )
308   PORT_DIPSETTING(    0x00, DEF_STR( Off ) )
309   PORT_DIPSETTING(    0x80, DEF_STR( On ) )
310
311   /* dummy active low structure */
312   PORT_START("DSWA")
313   PORT_DIPNAME( 0x01, 0x01, "DSWA" )
314   PORT_DIPSETTING(    0x01, DEF_STR( Off ) )
315   PORT_DIPSETTING(    0x00, DEF_STR( On ) )
316   PORT_DIPNAME( 0x02, 0x02, DEF_STR( Unknown ) )
317   PORT_DIPSETTING(    0x02, DEF_STR( Off ) )
318   PORT_DIPSETTING(    0x00, DEF_STR( On ) )
319   PORT_DIPNAME( 0x04, 0x04, DEF_STR( Unknown ) )
320   PORT_DIPSETTING(    0x04, DEF_STR( Off ) )
321   PORT_DIPSETTING(    0x00, DEF_STR( On ) )
322   PORT_DIPNAME( 0x08, 0x08, DEF_STR( Unknown ) )
323   PORT_DIPSETTING(    0x08, DEF_STR( Off ) )
324   PORT_DIPSETTING(    0x00, DEF_STR( On ) )
325   PORT_DIPNAME( 0x10, 0x10, DEF_STR( Unknown ) )
326   PORT_DIPSETTING(    0x10, DEF_STR( Off ) )
327   PORT_DIPSETTING(    0x00, DEF_STR( On ) )
328   PORT_DIPNAME( 0x20, 0x20, DEF_STR( Unknown ) )
329   PORT_DIPSETTING(    0x20, DEF_STR( Off ) )
330   PORT_DIPSETTING(    0x00, DEF_STR( On ) )
331   PORT_DIPNAME( 0x40, 0x40, DEF_STR( Unknown ) )
332   PORT_DIPSETTING(    0x40, DEF_STR( Off ) )
333   PORT_DIPSETTING(    0x00, DEF_STR( On ) )
334   PORT_DIPNAME( 0x80, 0x80, DEF_STR( Unknown ) )
335   PORT_DIPSETTING(    0x80, DEF_STR( Off ) )
336   PORT_DIPSETTING(    0x00, DEF_STR( On ) )
337INPUT_PORTS_END
338
339
340void apc_state::machine_start()
341{
342}
343
344void apc_state::machine_reset()
345{
346}
347
348
349void apc_state::palette_init()
350{
351}
352
353static UPD7220_INTERFACE( hgdc_1_intf )
354{
355   "screen",
356   NULL,
357   hgdc_draw_text,
358   DEVCB_NULL,
359   DEVCB_NULL,
360   DEVCB_NULL
361};
362
363
364static UPD7220_INTERFACE( hgdc_2_intf )
365{
366   "screen",
367   hgdc_display_pixels,
368   NULL,
369   DEVCB_NULL,
370   DEVCB_NULL,
371   DEVCB_NULL
372};
373
374static const gfx_layout charset_8x16 =
375{
376   8,16,
377   256,
378   1,
379   { 0 },
380   { 0, 1, 2, 3, 4, 5, 6, 7 },
381   { 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 },
382   8*16
383};
384
385
386static GFXDECODE_START( apc )
387   GFXDECODE_ENTRY( "gfx", 0x0000, charset_8x16, 0, 8 )
388GFXDECODE_END
389
390
391static ADDRESS_MAP_START( upd7220_1_map, AS_0, 8, apc_state)
392   AM_RANGE(0x00000, 0x3ffff) AM_RAM AM_SHARE("video_ram_1")
393ADDRESS_MAP_END
394
395static ADDRESS_MAP_START( upd7220_2_map, AS_0, 8, apc_state )
396   AM_RANGE(0x00000, 0x3ffff) AM_RAM AM_SHARE("video_ram_2")
397ADDRESS_MAP_END
398
399static const struct pit8253_config pit8253_config =
400{
401   {
402      {
403         1996800,              /* heartbeat IRQ */
404         DEVCB_NULL,
405         DEVCB_NULL
406      }, {
407         1996800,              /* Memory Refresh */
408         DEVCB_NULL,
409         DEVCB_NULL
410      }, {
411         1996800,              /* RS-232c */
412         DEVCB_NULL,
413         DEVCB_NULL
414      }
415   }
416};
417/*
418irq assignment:
419
4208259 master:
421ir0
422ir1
423ir2
424ir3
425ir4
426ir5
427ir6
428ir7
429
4308259 slave:
431ir0
432ir1
433ir2
434ir3
435ir4
436ir5
437ir6
438ir7
439*/
440
441
442WRITE_LINE_MEMBER(apc_state::apc_master_set_int_line)
443{
444   //printf("%02x\n",interrupt);
445   machine().device("maincpu")->execute().set_input_line(0, state ? HOLD_LINE : CLEAR_LINE);
446}
447
448READ8_MEMBER(apc_state::get_slave_ack)
449{
450   if (offset==7) { // IRQ = 7
451      return pic8259_acknowledge( machine().device( "pic8259_slave" ));
452   }
453   return 0x00;
454}
455
456static const struct pic8259_interface pic8259_master_config =
457{
458   DEVCB_DRIVER_LINE_MEMBER(apc_state, apc_master_set_int_line),
459   DEVCB_LINE_VCC,
460   DEVCB_DRIVER_MEMBER(apc_state,get_slave_ack)
461};
462
463static const struct pic8259_interface pic8259_slave_config =
464{
465   DEVCB_DEVICE_LINE("pic8259_master", pic8259_ir7_w), //TODO: check me
466   DEVCB_LINE_GND,
467   DEVCB_NULL
468};
469
470/****************************************
471*
472* I8237 DMA interface
473*
474****************************************/
475
476WRITE_LINE_MEMBER(apc_state::pc_dma_hrq_changed)
477{
478   machine().device("maincpu")->execute().set_input_line(INPUT_LINE_HALT, state ? ASSERT_LINE : CLEAR_LINE);
479
480   /* Assert HLDA */
481   i8237_hlda_w( machine().device("dma8237"), state );
482}
483
484
485READ8_MEMBER(apc_state::pc_dma_read_byte)
486{
487   offs_t page_offset = (((offs_t) m_dma_offset[0][m_dma_channel]) << 16)
488      & 0xFF0000;
489
490   return space.read_byte(page_offset + offset);
491}
492
493
494WRITE8_MEMBER(apc_state::pc_dma_write_byte)
495{
496   offs_t page_offset = (((offs_t) m_dma_offset[0][m_dma_channel]) << 16)
497      & 0xFF0000;
498
499   space.write_byte(page_offset + offset, data);
500}
501
502static void set_dma_channel(running_machine &machine, int channel, int state)
503{
504   apc_state *drvstate = machine.driver_data<apc_state>();
505   if (!state) drvstate->m_dma_channel = channel;
506}
507
508WRITE_LINE_MEMBER(apc_state::pc_dack0_w){ /*printf("%02x 0\n",state);*/ set_dma_channel(machine(), 0, state); }
509WRITE_LINE_MEMBER(apc_state::pc_dack1_w){ /*printf("%02x 1\n",state);*/ set_dma_channel(machine(), 1, state); }
510WRITE_LINE_MEMBER(apc_state::pc_dack2_w){ /*printf("%02x 2\n",state);*/ set_dma_channel(machine(), 2, state); }
511WRITE_LINE_MEMBER(apc_state::pc_dack3_w){ /*printf("%02x 3\n",state);*/ set_dma_channel(machine(), 3, state); }
512
513READ8_MEMBER(apc_state::test_r)
514{
515//   printf("2dd DACK R\n");
516
517   return 0xff;
518}
519
520WRITE8_MEMBER(apc_state::test_w)
521{
522//   printf("2dd DACK W\n");
523}
524
525static I8237_INTERFACE( dma8237_config )
526{
527   DEVCB_DRIVER_LINE_MEMBER(apc_state, pc_dma_hrq_changed),
528   DEVCB_NULL,
529   DEVCB_DRIVER_MEMBER(apc_state, pc_dma_read_byte),
530   DEVCB_DRIVER_MEMBER(apc_state, pc_dma_write_byte),
531   { DEVCB_NULL, DEVCB_NULL, DEVCB_NULL, DEVCB_DRIVER_MEMBER(apc_state,test_r) },
532   { DEVCB_NULL, DEVCB_NULL, DEVCB_NULL, DEVCB_DRIVER_MEMBER(apc_state,test_w) },
533   { DEVCB_DRIVER_LINE_MEMBER(apc_state, pc_dack0_w), DEVCB_DRIVER_LINE_MEMBER(apc_state, pc_dack1_w), DEVCB_DRIVER_LINE_MEMBER(apc_state, pc_dack2_w), DEVCB_DRIVER_LINE_MEMBER(apc_state, pc_dack3_w) }
534};
535
536static const floppy_format_type apc_floppy_formats[] = {
537   FLOPPY_D88_FORMAT,
538   FLOPPY_MFI_FORMAT,
539   NULL // TODO: IMD
540};
541
542static SLOT_INTERFACE_START( apc_floppies )
543   SLOT_INTERFACE( "525hd", FLOPPY_525_HD ) // TODO: 8"
544SLOT_INTERFACE_END
545
546
547#define MAIN_CLOCK XTAL_5MHz
548
549static MACHINE_CONFIG_START( apc, apc_state )
550
551   /* basic machine hardware */
552   MCFG_CPU_ADD("maincpu",I8086,MAIN_CLOCK)
553   MCFG_CPU_PROGRAM_MAP(apc_map)
554   MCFG_CPU_IO_MAP(apc_io)
555
556   MCFG_PIT8253_ADD( "pit8253", pit8253_config )
557   MCFG_PIC8259_ADD( "pic8259_master", pic8259_master_config )
558   MCFG_PIC8259_ADD( "pic8259_slave", pic8259_slave_config )
559   MCFG_I8237_ADD("8237dma", MAIN_CLOCK, dma8237_config)
560
561   MCFG_UPD765A_ADD("upd765", true, true)
562   MCFG_FLOPPY_DRIVE_ADD("upd765:0", apc_floppies, "525hd", 0, apc_floppy_formats)
563   MCFG_FLOPPY_DRIVE_ADD("upd765:1", apc_floppies, "525hd", 0, apc_floppy_formats)
564
565   /* video hardware */
566   MCFG_SCREEN_ADD("screen", RASTER)
567   MCFG_SCREEN_REFRESH_RATE(60)
568   MCFG_SCREEN_VBLANK_TIME(ATTOSECONDS_IN_USEC(2500))
569   MCFG_SCREEN_UPDATE_DRIVER(apc_state, screen_update)
570   MCFG_SCREEN_SIZE(32*8, 32*8)
571   MCFG_SCREEN_VISIBLE_AREA(0*8, 32*8-1, 0*8, 32*8-1)
572
573   MCFG_GFXDECODE(apc)
574
575   MCFG_UPD7220_ADD("upd7220_chr", 5000000/2, hgdc_1_intf, upd7220_1_map)
576   MCFG_UPD7220_ADD("upd7220_btm", 5000000/2, hgdc_2_intf, upd7220_2_map)
577
578   MCFG_PALETTE_LENGTH(8)
579
580   /* sound hardware */
581   MCFG_SPEAKER_STANDARD_MONO("mono")
582//  MCFG_SOUND_ADD("aysnd", AY8910, MAIN_CLOCK/4)
583//  MCFG_SOUND_ROUTE(ALL_OUTPUTS, "mono", 0.30)
584MACHINE_CONFIG_END
585
586
587/***************************************************************************
588
589  Game driver(s)
590
591***************************************************************************/
592
593ROM_START( apc )
594   ROM_REGION( 0x2000, "ipl", ROMREGION_ERASE00 )
595   ROM_LOAD16_BYTE( "pfbu2j.bin",   0x00000, 0x001000, CRC(86970df5) SHA1(be59c5dad3bd8afc21e9f2f1404553d4371978be) )
596    ROM_LOAD16_BYTE( "pfbu2l.bin",   0x00001, 0x001000, CRC(38df2e70) SHA1(a37ccaea00c2b290610d354de08b489fa897ec48) )
597
598//   ROM_REGION( 0x10000, "file", ROMREGION_ERASE00 )
599//   ROM_LOAD( "sioapc.o", 0, 0x10000, CRC(1) SHA1(1) )
600
601   ROM_REGION( 0x2000, "gfx", ROMREGION_ERASE00 )
602    ROM_LOAD( "pfcu1r.bin",   0x000000, 0x002000, BAD_DUMP CRC(683efa94) SHA1(43157984a1746b2e448f3236f571011af9a3aa73) )
603ROM_END
604
605DRIVER_INIT_MEMBER(apc_state,apc)
606{
607   UINT8 *ROM = memregion("ipl")->base();
608
609   /* patch DMA check */
610   ROM[0xff334 & 0x1fff] = 0x90;
611   ROM[0xff335 & 0x1fff] = 0x90;
612   ROM[0xff339 & 0x1fff] = 0x90;
613   ROM[0xff33a & 0x1fff] = 0x90;
614
615}
616
617GAME( 198?, apc,  0,   apc,  apc, apc_state,  apc,       ROT0, "NEC",      "APC", GAME_IS_SKELETON )

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