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diff --git a/src/mame/drivers/iez80.cpp b/src/mame/drivers/iez80.cpp
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+// license: BSD-3-Clause
+// copyright-holders: Dirk Best
+/***************************************************************************
+
+ Insight Enterprises Z80 Single Board Computer
+
+ Possibly a prototype or part of a larger system. A video with more
+ info is available at https://www.youtube.com/watch?v=_z1kBb-Zwpg.
+
+ TODO:
+ - Verify device hookup
+ - Figure out what's at 0x20, 0x21, 0x3c, 0x3d
+ - Hook up FDC
+ - Hook up CRT8002 (video attributes)
+ - Much more
+
+***************************************************************************/
+
+#include "emu.h"
+#include "cpu/z80/z80.h"
+#include "machine/upd765.h"
+#include "machine/z80ctc.h"
+#include "machine/z80dma.h"
+#include "machine/z80pio.h"
+#include "machine/z80sio.h"
+#include "video/tms9927.h"
+#include "emupal.h"
+#include "screen.h"
+
+
+namespace {
+
+
+//**************************************************************************
+// TYPE DEFINITIONS
+//**************************************************************************
+
+class iez80_state : public driver_device
+{
+public:
+ iez80_state(const machine_config &mconfig, device_type type, const char *tag)
+ : driver_device(mconfig, type, tag),
+ m_maincpu(*this, "maincpu"),
+ m_crtc(*this, "crtc"),
+ m_palette(*this, "palette"),
+ m_chargen(*this, "chargen"),
+ m_vram(*this, "vram")
+ { }
+
+ void iez80(machine_config &config);
+
+protected:
+ virtual void machine_start() override;
+ virtual void machine_reset() override;
+
+private:
+ required_device<z80_device> m_maincpu;
+ required_device<crt5037_device> m_crtc;
+ required_device<palette_device> m_palette;
+ required_region_ptr<uint8_t> m_chargen;
+ required_shared_ptr<uint8_t> m_vram;
+
+ void mem_map(address_map &map);
+ void io_map(address_map &map);
+
+ uint32_t screen_update(screen_device &screen, bitmap_rgb32 &bitmap, const rectangle &cliprect);
+};
+
+
+//**************************************************************************
+// ADDRESS MAPS
+//**************************************************************************
+
+void iez80_state::mem_map(address_map &map)
+{
+ map(0x0000, 0x0fff).rom().region("maincpu", 0);
+ map(0x2000, 0x2fff).ram().share("vram");
+ map(0xe000, 0xffff).ram();
+}
+
+void iez80_state::io_map(address_map &map)
+{
+ map.global_mask(0xff);
+// map(0x20, 0x20).lr8([this]() { return machine().rand(); }, "unk20");
+// map(0x21, 0x21).lr8([this]() { return machine().rand(); }, "unk21");
+ map(0x24, 0x27).rw("pio", FUNC(z80pio_device::read), FUNC(z80pio_device::write));
+ map(0x28, 0x2b).rw("ctc", FUNC(z80ctc_device::read), FUNC(z80ctc_device::write));
+ map(0x2c, 0x2f).rw("dart1", FUNC(z80sio_device::ba_cd_r), FUNC(z80sio_device::ba_cd_w));
+ map(0x32, 0x32).rw("dma", FUNC(z80dma_device::read), FUNC(z80dma_device::write));
+ map(0x38, 0x3b).rw("dart2", FUNC(z80sio_device::ba_cd_r), FUNC(z80sio_device::ba_cd_w));
+// map(0x3c, 0x3c).lr8([this]() { return machine().rand(); }, "unk3c");
+// map(0x3d, 0x3d).lr8([this]() { return machine().rand(); }, "unk3d");
+ map(0x40, 0x4f).rw("crtc", FUNC(crt5037_device::read), FUNC(crt5037_device::write));
+}
+
+
+//**************************************************************************
+// INPUT DEFINITIONS
+//**************************************************************************
+
+static INPUT_PORTS_START( iez80 )
+INPUT_PORTS_END
+
+
+//**************************************************************************
+// VIDEO EMULATION
+//**************************************************************************
+
+uint32_t iez80_state::screen_update(screen_device &screen, bitmap_rgb32 &bitmap, const rectangle &cliprect)
+{
+ rgb_t const *const pen = m_palette->palette()->entry_list_raw();
+
+ rectangle cursor;
+ m_crtc->cursor_bounds(cursor);
+
+ for (int y = 0; y < 24; y++)
+ {
+ for (int ra = 0; ra < 12; ra++)
+ {
+ for (int x = 0; x < 80; x++)
+ {
+ uint8_t chr = m_vram[(y * 160) + (x * 2) + 0];
+ // uint8_t attr = m_vram[(y * 160) + (x * 2) + 1];
+ uint8_t data = m_chargen[((chr << 4) | ra) & 0x7ff];
+
+ if (cursor.contains(x * 8, y * 12))
+ data ^= 0xff;
+
+ // draw 8 pixels of the char
+ for (int i = 0; i < 8; i++)
+ bitmap.pix(y * 12 + ra, x * 8 + i) = pen[BIT(data, 7 - i)];
+ }
+ }
+ }
+
+ return 0;
+}
+
+static const gfx_layout crt8002_charlayout =
+{
+ 8, 12,
+ RGN_FRAC(1,1),
+ 1,
+ { 0 },
+ { STEP8(0,1) },
+ { 0*8, 1*8, 2*8, 3*8, 4*8, 5*8, 6*8, 7*8, 8*8, 9*8, 10*8, 11*8 },
+ 8*16
+};
+
+static GFXDECODE_START( gfx_crt8002 )
+ GFXDECODE_ENTRY("chargen", 0, crt8002_charlayout, 0, 1)
+GFXDECODE_END
+
+
+//**************************************************************************
+// MACHINE EMULATION
+//**************************************************************************
+
+void iez80_state::machine_start()
+{
+}
+
+void iez80_state::machine_reset()
+{
+}
+
+
+//**************************************************************************
+// MACHINE DEFINTIONS
+//**************************************************************************
+
+static const z80_daisy_config daisy_chain[] =
+{
+ { "ctc" },
+ { nullptr }
+};
+
+void iez80_state::iez80(machine_config &config)
+{
+ Z80(config, m_maincpu, 2'500'000); // unknown clock
+ m_maincpu->set_addrmap(AS_PROGRAM, &iez80_state::mem_map);
+ m_maincpu->set_addrmap(AS_IO, &iez80_state::io_map);
+ m_maincpu->set_daisy_config(daisy_chain);
+
+ Z80DMA(config, "dma", 4'000'000); // unknown clock
+
+ z80ctc_device& ctc(Z80CTC(config, "ctc", 4'000'000)); // unknown clock
+ ctc.intr_callback().set_inputline(m_maincpu, INPUT_LINE_IRQ0);
+
+ Z80PIO(config, "pio", 4'000'000); // unknown clock
+
+ Z80DART(config, "dart1", 4'000'000); // unknown clock (5.0688_MHz_XTAL near)
+
+ Z80DART(config, "dart2", 4'000'000); // unknown clock (5.0688_MHz_XTAL near)
+
+ // video hardware
+ screen_device &screen(SCREEN(config, "screen", SCREEN_TYPE_RASTER));
+ screen.set_raw(17'550'000, 816, 0, 640, 358, 0, 288); // unknown clock, hand-tuned to ~60fps
+ screen.set_screen_update(FUNC(iez80_state::screen_update));
+
+ GFXDECODE(config, "gfxdecode", "palette", gfx_crt8002);
+
+ PALETTE(config, m_palette, palette_device::MONOCHROME);
+
+ CRT5037(config, m_crtc, 17'550'000 / 8); // unknown clock
+ m_crtc->set_char_width(8);
+ m_crtc->set_screen("screen");
+}
+
+
+//**************************************************************************
+// ROM DEFINITIONS
+//**************************************************************************
+
+ROM_START( iez80 )
+ ROM_REGION(0x1000, "maincpu", 0)
+ ROM_LOAD("iez80.bin", 0x0000, 0x1000, CRC(d73137d2) SHA1(a340a47c5f37bbef244d35d581ff0beeeec5d677))
+
+ ROM_REGION(0x800, "chargen", 0)
+ ROM_LOAD("8002.bin", 0x0000, 0x0800, CRC(fdd6eb13) SHA1(a094d416e66bdab916e72238112a6265a75ca690))
+ROM_END
+
+
+} // anonymous namespace
+
+
+//**************************************************************************
+// SYSTEM DRIVERS
+//**************************************************************************
+
+// YEAR NAME PARENT COMPAT MACHINE INPUT CLASS INIT COMPANY FULLNAME FLAGS
+COMP( 1983, iez80, 0, 0, iez80, iez80, iez80_state, empty_init, "Insight Enterprises", "Z80 SBC (Prototype?)", MACHINE_IS_SKELETON )