// license:MAME // copyright-holders:Robbbert /************************************************************************************************************ Genrad Futuredata 2301 Network Control Processor 2013-08-11 Skeleton Has a number of plug-in daughter boards, some of which are: - CPU board: Mostek Z80 CPU, 24MHz crystal, 2 eproms (U2.PB72.2300.4039 1.0 ; U23.N.C.P.2300.4023 3.0) - IO board: 5.0688MHz crystal, D8253C, 2x S2651 - Memory board: 16k static ram consisting of 32x TMS2147H-7 chips, 1 prom? with sticker U36.2300.4035 1.0 - 2301 board: 2x D8253C, 4x S2651 Back panel has a number of DB25 sockets, labelled thus: - Station 1-4 - Station 5-8 - EIA 1 - EIA 2 - Printer - 3 unlabelled ones A sticker on the back panel says: GenRad, Culver City CA, Model 2301-9001 - No schematic or documents are available. Everything in this driver is a guess. - Only one rom has been dumped. The best guess would be U23, as this is adjacent to the Z80. - Although there's no display device, it has display ram. This has been hooked up with a chargen rom from another system. *************************************************************************************************************/ #include "emu.h" #include "cpu/z80/z80.h" class grfd2301_state : public driver_device { public: grfd2301_state(const machine_config &mconfig, device_type type, const char *tag) : driver_device(mconfig, type, tag) , m_p_videoram(*this, "videoram") , m_maincpu(*this, "maincpu") { } public: virtual void machine_reset(); const UINT8 *m_p_chargen; UINT32 screen_update(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect); required_shared_ptr m_p_videoram; private: required_device m_maincpu; }; static ADDRESS_MAP_START( grfd2301_mem, AS_PROGRAM, 8, grfd2301_state ) AM_RANGE(0xe000, 0xefff) AM_ROM AM_REGION("maincpu", 0) AM_RANGE(0xf000, 0xf7ff) AM_RAM AM_RANGE(0xf800, 0xffff) AM_RAM AM_SHARE("videoram") ADDRESS_MAP_END static ADDRESS_MAP_START( grfd2301_io, AS_IO, 8, grfd2301_state ) ADDRESS_MAP_GLOBAL_MASK(0xff) ADDRESS_MAP_END static INPUT_PORTS_START( grfd2301 ) INPUT_PORTS_END void grfd2301_state::machine_reset() { m_p_chargen = memregion("chargen")->base(); m_maincpu->set_pc(0xe000); } UINT32 grfd2301_state::screen_update(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect) { UINT8 y,ra,chr,gfx; UINT16 sy=0,ma=0,x; for (y = 0; y < 24; y++) { for (ra = 0; ra < 10; ra++) { UINT16 *p = &bitmap.pix16(sy++); for (x = 0; x < 80; x++) { gfx = 0; if (ra < 9) { chr = m_p_videoram[x+ma]; gfx = m_p_chargen[(chr<<4) | ra ]; } /* Display a scanline of a character */ *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+=80; } return 0; } static MACHINE_CONFIG_START( grfd2301, grfd2301_state ) // basic machine hardware MCFG_CPU_ADD("maincpu", Z80, 4000000) MCFG_CPU_PROGRAM_MAP(grfd2301_mem) MCFG_CPU_IO_MAP(grfd2301_io) /* video hardware */ MCFG_SCREEN_ADD("screen", RASTER) MCFG_SCREEN_REFRESH_RATE(60) MCFG_SCREEN_VBLANK_TIME(ATTOSECONDS_IN_USEC(2500)) /* not accurate */ MCFG_SCREEN_UPDATE_DRIVER(grfd2301_state, screen_update) MCFG_SCREEN_SIZE(640, 240) MCFG_SCREEN_VISIBLE_AREA(0, 639, 0, 239) MCFG_SCREEN_PALETTE("palette") MCFG_PALETTE_ADD_BLACK_AND_WHITE("palette") MACHINE_CONFIG_END ROM_START( grfd2301 ) ROM_REGION( 0x1000, "maincpu", 0 ) ROM_LOAD( "boot2301", 0x000, 0x1000, CRC(feec0cbd) SHA1(ec8138aca7ed489d86aaf2e07225c8d715440db7) ) // Using the chargen from 'c10' for now. ROM_REGION( 0x2000, "chargen", 0 ) ROM_LOAD( "c10_char.bin", 0x0000, 0x2000, BAD_DUMP CRC(cb530b6f) SHA1(95590bbb433db9c4317f535723b29516b9b9fcbf)) ROM_END COMP( 198?, grfd2301, 0, 0, grfd2301, grfd2301, driver_device, 0, "Genrad", "Futuredata 2301 Network Processor", GAME_NOT_WORKING | GAME_NO_SOUND_HW )