/*************************************************************************** DEC VT520 02/07/2009 Skeleton driver. ****************************************************************************/ #include "emu.h" #include "machine/ram.h" #include "cpu/mcs51/mcs51.h" class vt520_state : public driver_device { public: vt520_state(const machine_config &mconfig, device_type type, const char *tag) : driver_device(mconfig, type, tag) , m_maincpu(*this, "maincpu") { } DECLARE_READ8_MEMBER(vt520_some_r); virtual void machine_reset(); virtual void video_start(); UINT32 screen_update_vt520(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect); required_device m_maincpu; }; static ADDRESS_MAP_START(vt520_mem, AS_PROGRAM, 8, vt520_state) AM_RANGE(0x0000, 0xffff) AM_RAMBANK("bank1") ADDRESS_MAP_END /* On the boardthere is TC160G41AF (1222) custom chip doing probably all video/uart logic there is 43.430MHz xtal near by */ READ8_MEMBER( vt520_state::vt520_some_r ) { //bit 5 0 //bit 6 1 return 0x40; } static ADDRESS_MAP_START(vt520_io, AS_IO, 8, vt520_state) ADDRESS_MAP_UNMAP_HIGH AM_RANGE(0x7ffb, 0x7ffb) AM_READ(vt520_some_r) ADDRESS_MAP_END /* Input ports */ static INPUT_PORTS_START( vt520 ) INPUT_PORTS_END void vt520_state::machine_reset() { address_space &space = m_maincpu->space(AS_PROGRAM); UINT8 *rom = memregion("maincpu")->base(); space.unmap_write(0x0000, 0xffff); membank("bank1")->set_base(rom + 0x70000); } void vt520_state::video_start() { } UINT32 vt520_state::screen_update_vt520(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect) { return 0; } static MACHINE_CONFIG_START( vt520, vt520_state ) /* basic machine hardware */ MCFG_CPU_ADD("maincpu",I8032, XTAL_20MHz) MCFG_CPU_PROGRAM_MAP(vt520_mem) MCFG_CPU_IO_MAP(vt520_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(802, 480) MCFG_SCREEN_VISIBLE_AREA(0, 802-1, 0, 480-1) MCFG_SCREEN_UPDATE_DRIVER(vt520_state, screen_update_vt520) MCFG_SCREEN_PALETTE("palette") MCFG_PALETTE_ADD_BLACK_AND_WHITE("palette") // On the board there are two M5M44256BJ-7 chips // Which are DRAM 256K x 4bit /* internal ram */ MCFG_RAM_ADD(RAM_TAG) MCFG_RAM_DEFAULT_SIZE("256K") MACHINE_CONFIG_END /* ROM definition */ ROM_START( vt520 ) ROM_REGION( 0x80000, "maincpu", ROMREGION_ERASEFF ) ROM_LOAD( "23-010ed-00.e20", 0x0000, 0x80000, CRC(2502cc22) SHA1(0437c3107412f69e09d050fef003f2a81d8a3163)) // "(C)DEC94 23-010ED-00 // 9739 D" dumped from a VT520-A4 model ROM_END /* Driver */ /* YEAR NAME PARENT COMPAT MACHINE INPUT INIT COMPANY FULLNAME FLAGS */ //COMP( 1993, vt510, 0, 0, vt520, vt520, driver_device, 0, "Digital Equipment Corporation", "VT510", GAME_NOT_WORKING) COMP( 1994, vt520, 0, 0, vt520, vt520, driver_device, 0, "Digital Equipment Corporation", "VT520", GAME_NOT_WORKING | GAME_NO_SOUND) //COMP( 1994, vt525, 0, 0, vt520, vt520, driver_device, 0, "Digital Equipment Corporation", "VT525", GAME_NOT_WORKING)