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+// license:BSD-3-Clause
+// copyright-holders:Miodrag Milanovic
+/***************************************************************************
+
+Elektronika MK-90
+
+2009-05-12 Skeleton driver.
+
+
+ http://www.pisi.com.pl/piotr433/index.htm#mk90
+ http://www.taswegian.com/MOSCOW/mk-90.html
+
+This is a Soviet computer-calculator, very similar in looks to the Sharp.
+It has a LCD display. It cost about 1500 roubles, which is the wages for 6
+months for an average citizen.
+
+Status: Starts in the weeds.
+
+****************************************************************************/
+
+#include "emu.h"
+#include "cpu/t11/t11.h"
+#include "emupal.h"
+#include "screen.h"
+
+
+namespace {
+
+class mk90_state : public driver_device
+{
+public:
+ mk90_state(const machine_config &mconfig, device_type type, const char *tag)
+ : driver_device(mconfig, type, tag)
+ , m_maincpu(*this, "maincpu")
+ { }
+
+ void mk90(machine_config &config);
+
+private:
+ virtual void machine_reset() override ATTR_COLD;
+ virtual void machine_start() override ATTR_COLD;
+
+ void mem_map(address_map &map) ATTR_COLD;
+
+ uint32_t screen_update(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect);
+
+ required_device<k1801vm2_device> m_maincpu;
+};
+
+
+void mk90_state::mem_map(address_map &map)
+{
+ map.unmap_value_high();
+ map(0x0000, 0x3fff).ram(); // RAM
+ map(0x4000, 0x7fff).rom(); // Extension ROM
+ map(0x8000, 0xffff).rom(); // Main ROM
+// map(0xe800, 0xe801) LCD address
+// map(0xe802, 0xe803) LCD data
+// map(0xe810, 0xe810) serial bus controller data
+// map(0xe812, 0xe813) serial bus controller transfer rate
+// map(0xe814, 0xe814) serial bus controller control/status
+// map(0xe816, 0xe816) serial bus controller command
+// map(0xea00, 0xea7e) RTC
+}
+
+/* Input ports */
+static INPUT_PORTS_START( mk90 )
+INPUT_PORTS_END
+
+
+void mk90_state::machine_reset()
+{
+}
+
+void mk90_state::machine_start()
+{
+}
+
+uint32_t mk90_state::screen_update(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect)
+{
+ return 0;
+}
+
+void mk90_state::mk90(machine_config &config)
+{
+ /* basic machine hardware */
+ K1801VM2(config, m_maincpu, XTAL(4'000'000));
+ m_maincpu->set_initial_mode(0x8000);
+ m_maincpu->set_addrmap(AS_PROGRAM, &mk90_state::mem_map);
+
+ /* 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(640, 480);
+ screen.set_visarea(0, 640-1, 0, 480-1);
+ screen.set_screen_update(FUNC(mk90_state::screen_update));
+ screen.set_palette("palette");
+
+ PALETTE(config, "palette", palette_device::MONOCHROME);
+}
+
+/* ROM definition */
+ROM_START( mk90 )
+ ROM_REGION( 0x10000, "maincpu", ROMREGION_ERASEFF )
+ ROM_SYSTEM_BIOS(0, "bas1", "Basic 1")
+ ROMX_LOAD( "mk90ro10.bin", 0x8000, 0x8000, CRC(fac18038) SHA1(639f09a1be5f781f897603d0f799f7c6efd1b67f), ROM_BIOS(0))
+
+ ROM_SYSTEM_BIOS(1, "bas2", "Basic 2")
+ ROMX_LOAD( "mk90ro20.bin", 0x8000, 0x8000, CRC(d8b3a5f5) SHA1(8f7ab2d97c7466392b6354c0ea7017531c2133ae), ROM_BIOS(1))
+ ROMX_LOAD( "mk90ro20t.bin", 0x4000, 0x4000, CRC(0f4b9434) SHA1(c74bbde6d201913c9e67ef8e2abe14b784187f8d), ROM_BIOS(1)) // Expansion ROM
+ROM_END
+
+} // anonymous namespace
+
+
+/* Driver */
+
+/* YEAR NAME PARENT COMPAT MACHINE INPUT CLASS INIT COMPANY FULLNAME FLAGS */
+COMP( 1988, mk90, 0, 0, mk90, mk90, mk90_state, empty_init, "Elektronika", "MK-90", MACHINE_NOT_WORKING | MACHINE_NO_SOUND | MACHINE_SUPPORTS_SAVE )