diff options
Diffstat (limited to 'src/mame/drivers/vt520.c')
-rw-r--r-- | src/mame/drivers/vt520.c | 111 |
1 files changed, 111 insertions, 0 deletions
diff --git a/src/mame/drivers/vt520.c b/src/mame/drivers/vt520.c new file mode 100644 index 00000000000..9f4b0216587 --- /dev/null +++ b/src/mame/drivers/vt520.c @@ -0,0 +1,111 @@ +// license:BSD-3-Clause +// copyright-holders:Miodrag Milanovic, Jonathan Gevaryahu +/*************************************************************************** + + 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<cpu_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 board there 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", MACHINE_NOT_WORKING) +COMP( 1994, vt520, 0, 0, vt520, vt520, driver_device, 0, "Digital Equipment Corporation", "VT520", MACHINE_NOT_WORKING | MACHINE_NO_SOUND) +//COMP( 1994, vt525, 0, 0, vt520, vt520, driver_device, 0, "Digital Equipment Corporation", "VT525", MACHINE_NOT_WORKING) |