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diff --git a/src/mame/dec/vt520.cpp b/src/mame/dec/vt520.cpp
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+// license:BSD-3-Clause
+// copyright-holders:Miodrag Milanovic, Jonathan Gevaryahu
+/***************************************************************************
+
+ DEC VT520
+
+ 02/07/2009 Skeleton driver.
+
+****************************************************************************/
+
+#include "emu.h"
+#include "cpu/mcs51/mcs51.h"
+//#include "machine/mc68681.h"
+#include "machine/ram.h"
+#include "emupal.h"
+#include "screen.h"
+
+
+namespace {
+
+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"),
+ m_rom(*this, "maincpu")
+ { }
+
+ void vt520(machine_config &config);
+ void vt420(machine_config &config);
+
+private:
+ uint8_t vt520_some_r();
+ virtual void machine_reset() override ATTR_COLD;
+ virtual void video_start() override ATTR_COLD;
+ uint32_t screen_update_vt520(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect);
+ required_device<cpu_device> m_maincpu;
+ required_region_ptr<uint8_t> m_rom;
+ void vt520_io(address_map &map) ATTR_COLD;
+ void vt520_mem(address_map &map) ATTR_COLD;
+};
+
+
+void vt520_state::vt520_mem(address_map &map)
+{
+ map(0x0000, 0xffff).bankrw("bank1");
+}
+
+/*
+ On the board there is TC160G41AF (1222) custom chip
+ doing probably all video/uart logic
+ there is 43.320MHz xtal near by
+*/
+
+uint8_t vt520_state::vt520_some_r()
+{
+ //bit 5 0
+ //bit 6 1
+ return 0x40;
+}
+
+void vt520_state::vt520_io(address_map &map)
+{
+ map.unmap_value_high();
+ map(0x7ffb, 0x7ffb).r(FUNC(vt520_state::vt520_some_r));
+}
+
+/* Input ports */
+static INPUT_PORTS_START( vt520 )
+INPUT_PORTS_END
+
+
+void vt520_state::machine_reset()
+{
+ address_space &space = m_maincpu->space(AS_PROGRAM);
+ space.unmap_write(0x0000, 0xffff);
+ membank("bank1")->set_base(&m_rom[m_rom.length() - 0x10000]);
+}
+
+void vt520_state::video_start()
+{
+}
+
+uint32_t vt520_state::screen_update_vt520(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect)
+{
+ return 0;
+}
+
+void vt520_state::vt420(machine_config &config)
+{
+ /* basic machine hardware */
+ I80C31(config, m_maincpu, XTAL(43'320'000) / 3); // SCN8031HCFN40 (divider not verified)
+ m_maincpu->set_addrmap(AS_PROGRAM, &vt520_state::vt520_mem);
+ m_maincpu->set_addrmap(AS_IO, &vt520_state::vt520_io);
+
+ /* video hardware */
+ screen_device &screen(SCREEN(config, "screen", SCREEN_TYPE_RASTER));
+ screen.set_refresh_hz(50);
+ screen.set_vblank_time(ATTOSECONDS_IN_USEC(2500)); /* not accurate */
+ screen.set_size(802, 480);
+ screen.set_visarea(0, 802-1, 0, 480-1);
+ screen.set_screen_update(FUNC(vt520_state::screen_update_vt520));
+ screen.set_palette("palette");
+
+ PALETTE(config, "palette", palette_device::MONOCHROME);
+}
+
+void vt520_state::vt520(machine_config &config)
+{
+ /* basic machine hardware */
+ I80C32(config, m_maincpu, XTAL(20'000'000)); // Philips P80C32IBPN
+ m_maincpu->set_addrmap(AS_PROGRAM, &vt520_state::vt520_mem);
+ m_maincpu->set_addrmap(AS_IO, &vt520_state::vt520_io);
+
+ /* video hardware */
+ screen_device &screen(SCREEN(config, "screen", SCREEN_TYPE_RASTER));
+ screen.set_refresh_hz(50);
+ screen.set_vblank_time(ATTOSECONDS_IN_USEC(2500)); /* not accurate */
+ screen.set_size(802, 480);
+ screen.set_visarea(0, 802-1, 0, 480-1);
+ screen.set_screen_update(FUNC(vt520_state::screen_update_vt520));
+ screen.set_palette("palette");
+
+ PALETTE(config, "palette", palette_device::MONOCHROME);
+
+ // On the board there are two M5M44256BJ-7 chips
+ // Which are DRAM 256K x 4bit
+ /* internal ram */
+ RAM(config, RAM_TAG).set_default_size("256K");
+}
+
+/**************************************************************************************************************
+
+DEC VT420.
+Chips: SCN8031HCFN40, SCN2681TC1N40, M5M4464AP, HM62256LFP-10T, TC23SC070AT, TC531001CP-1815
+Crystals: 43.320
+
+***************************************************************************************************************/
+
+ROM_START( vt420 )
+ ROM_REGION(0x20000, "maincpu", 0)
+ ROM_SYSTEM_BIOS(0, "v14", "Version 1.4")
+ ROMX_LOAD( "23-202e9.e2", 0x00000, 0x20000, CRC(ca6cfb18) SHA1(2e0d3c16e04808bc6a45a0fc032b597458e6dd85), ROM_BIOS(0) )
+ ROM_SYSTEM_BIOS(1, "v13", "Version 1.3")
+ ROMX_LOAD( "23-068e9-00.e2", 0x00000, 0x20000, CRC(22c3f93b) SHA1(b212911c41e4dba2e09d91fdd1f72d6c7536b0af), ROM_BIOS(1) )
+ROM_END
+
+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
+
+} // anonymous namespace
+
+
+/* Driver */
+
+COMP( 1990, vt420, 0, 0, vt420, vt520, vt520_state, empty_init, "Digital Equipment Corporation", "VT420 Video Terminal", MACHINE_NO_SOUND | MACHINE_NOT_WORKING )
+//COMP( 1993, vt510, 0, 0, vt520, vt520, vt520_state, empty_init, "Digital Equipment Corporation", "VT510 Video Terminal", MACHINE_NO_SOUND | MACHINE_NOT_WORKING)
+COMP( 1994, vt520, 0, 0, vt520, vt520, vt520_state, empty_init, "Digital Equipment Corporation", "VT520 Video Terminal", MACHINE_NO_SOUND | MACHINE_NOT_WORKING)
+//COMP( 1994, vt525, 0, 0, vt520, vt520, vt520_state, empty_init, "Digital Equipment Corporation", "VT525 Video Terminal", MACHINE_NO_SOUND | MACHINE_NOT_WORKING)