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+// license: BSD-3-Clause
+// copyright-holders: Dirk Best
+/***************************************************************************
+
+ Visual Technology Visual 50/55
+
+ VT52 compatible terminal
+
+ Hardware:
+ - D780C (Z80)
+ - 2764 and 2732 EPROM
+ - 2x TMM314APL-1 (1k RAM)
+ - X2210D NOVRAM (64x4) (X2210 for REV A)
+ - Intel P8253-5 PIT
+ - D8255AC-5 PPI
+ - 2x D8251AC USART
+ - SCN2672A (SCN2672 N for REV A)
+ - 2673
+ - TMM2016P-2 (2k VRAM)
+ - C68100 IC240-001R00 (character generator?)
+ - 17.320 MHz XTAL
+
+ TODO:
+ - Screen attributes (reverse sometimes works)
+ - Smooth scroll
+ - Screen brightness control
+ - Most PPI connections are unknown
+ - AUX port
+
+ Notes:
+ - PCB marked "PA015-A REV A" for R08 firmware
+ - PCB marked "PA015 REV B 1183" for R11 firmware
+ - Use TERM=vi50 and disable AUTO LF/CR in setup mode
+
+***************************************************************************/
+
+#include "emu.h"
+
+#include "v50_kbd.h"
+
+#include "bus/rs232/rs232.h"
+#include "cpu/z80/z80.h"
+#include "machine/i8251.h"
+#include "machine/i8255.h"
+#include "machine/input_merger.h"
+#include "machine/pit8253.h"
+#include "machine/x2212.h"
+#include "video/scn2674.h"
+
+#include "emupal.h"
+#include "screen.h"
+
+
+namespace {
+
+
+//**************************************************************************
+// TYPE DEFINITIONS
+//**************************************************************************
+
+class visual50_state : public driver_device
+{
+public:
+ visual50_state(const machine_config &mconfig, device_type type, const char *tag) :
+ driver_device(mconfig, type, tag),
+ m_maincpu(*this, "maincpu"),
+ m_novram(*this, "novram"),
+ m_pit(*this, "pit"),
+ m_screen(*this, "screen"),
+ m_palette(*this, "palette"),
+ m_pvtc(*this, "pvtc"),
+ m_usart(*this, "usart%u", 0U),
+ m_vram(*this, "vram"),
+ m_chargen(*this, "chargen")
+ { }
+
+ void visual50(machine_config &config);
+
+protected:
+ virtual void machine_start() override ATTR_COLD;
+ virtual void machine_reset() override ATTR_COLD;
+
+private:
+ required_device<z80_device> m_maincpu;
+ required_device<x2210_device> m_novram;
+ required_device<pit8253_device> m_pit;
+ required_device<screen_device> m_screen;
+ required_device<palette_device> m_palette;
+ required_device<scn2672_device> m_pvtc;
+ required_device_array<i8251_device, 2> m_usart;
+ required_shared_ptr<uint8_t> m_vram;
+ required_region_ptr<uint8_t> m_chargen;
+
+ void mem_map(address_map &map) ATTR_COLD;
+ void io_map(address_map &map) ATTR_COLD;
+ void char_map(address_map &map) ATTR_COLD;
+
+ SCN2672_DRAW_CHARACTER_MEMBER(draw_character);
+
+ void ppi_porta_w(uint8_t data);
+ void ppi_portb_w(uint8_t data);
+ void ppi_portc_w(uint8_t data);
+
+ uint8_t recall_r();
+ void recall_w(uint8_t data);
+ uint8_t store_r();
+ void store_w(uint8_t data);
+};
+
+
+//**************************************************************************
+// ADDRESS MAPS
+//**************************************************************************
+
+void visual50_state::mem_map(address_map &map)
+{
+ map(0x0000, 0x2fff).rom().region("maincpu", 0);
+ map(0x8000, 0x83ff).ram();
+ map(0xa000, 0xa03f).rw(m_novram, FUNC(x2210_device::read), FUNC(x2210_device::write));
+ map(0xc000, 0xc000).rw(FUNC(visual50_state::recall_r), FUNC(visual50_state::recall_w));
+ map(0xe000, 0xe000).rw(FUNC(visual50_state::store_r), FUNC(visual50_state::store_w));
+}
+
+void visual50_state::io_map(address_map &map)
+{
+ map.global_mask(0xff);
+ map(0x00, 0x07).rw(m_pvtc, FUNC(scn2672_device::read), FUNC(scn2672_device::write));
+ map(0x10, 0x11).rw(m_usart[0], FUNC(i8251_device::read), FUNC(i8251_device::write));
+ map(0x20, 0x21).rw(m_usart[1], FUNC(i8251_device::read), FUNC(i8251_device::write));
+ map(0x40, 0x40).r(m_pvtc, FUNC(scn2672_device::buffer_r));
+ map(0x50, 0x50).w(m_pvtc, FUNC(scn2672_device::buffer_w));
+ map(0x60, 0x63).rw("ppi", FUNC(i8255_device::read), FUNC(i8255_device::write));
+ map(0x70, 0x73).rw(m_pit, FUNC(pit8253_device::read), FUNC(pit8253_device::write));
+}
+
+void visual50_state::char_map(address_map &map)
+{
+ map(0x000, 0x7ff).ram().share("vram");
+}
+
+
+//**************************************************************************
+// INPUT PORT DEFINITIONS
+//**************************************************************************
+
+static INPUT_PORTS_START( visual50 )
+INPUT_PORTS_END
+
+
+//**************************************************************************
+// VIDEO EMULATION
+//**************************************************************************
+
+SCN2672_DRAW_CHARACTER_MEMBER( visual50_state::draw_character )
+{
+ uint16_t data = m_chargen[(charcode & 0x7f) << 4 | linecount];
+ const pen_t *const pen = m_palette->pens();
+
+ if (BIT(charcode, 7))
+ data = ~data; // wrong
+
+ if (cursor)
+ data = ~data;
+
+ // foreground/background colors
+ rgb_t fg = pen[2];
+ rgb_t bg = pen[0];
+
+ // draw 9 pixels of the character
+ for (int i = 0; i < 9; i++)
+ bitmap.pix(y, x + i) = BIT(data, 8 - i) ? fg : bg;
+}
+
+static const gfx_layout char_layout =
+{
+ 8, 12,
+ RGN_FRAC(1,1),
+ 1,
+ { 0 },
+ { STEP8(0, 1) },
+ { STEP16(0, 8) },
+ 8 * 16
+};
+
+static GFXDECODE_START( chars )
+ GFXDECODE_ENTRY("chargen", 0, char_layout, 0, 1)
+GFXDECODE_END
+
+
+//**************************************************************************
+// MACHINE EMULATION
+//**************************************************************************
+
+void visual50_state::ppi_porta_w(uint8_t data)
+{
+ // 7------- unknown
+ // -6------ unknown
+ // --5----- unknown
+ // ---43210 brightness (0x00 = brightest, 0x1f = darkest)
+
+ logerror("porta_w: %02x\n", data);
+}
+
+void visual50_state::ppi_portb_w(uint8_t data)
+{
+ // 7------- unknown
+ // -6------ monitor mode
+ // --5----- unknown
+ // ---4---- reverse video
+ // ----3--- unknown
+ // -----2-- local echo
+ // ------1- unknown
+ // -------0 unknown
+
+ logerror("portb_w: %02x\n", data);
+}
+
+void visual50_state::ppi_portc_w(uint8_t data)
+{
+ // 7------- unknown
+ // -6------ rs232/current loop
+ // --5----- unknown
+ // ---4---- unknown, toggles
+ // ----3--- reverse video
+ // -----2-- unknown
+ // ------1- unknown
+ // -------0 unknown
+
+ logerror("portc_w: %02x\n", data);
+}
+
+uint8_t visual50_state::recall_r()
+{
+ if (!machine().side_effects_disabled())
+ {
+ m_novram->recall(1);
+ m_novram->recall(0);
+ }
+
+ return 0xff;
+}
+
+void visual50_state::recall_w(uint8_t data)
+{
+ m_novram->recall(1);
+ m_novram->recall(0);
+}
+
+uint8_t visual50_state::store_r()
+{
+ if (!machine().side_effects_disabled())
+ {
+ m_novram->store(1);
+ m_novram->store(0);
+ }
+
+ return 0xff;
+}
+
+void visual50_state::store_w(uint8_t data)
+{
+ m_novram->store(1);
+ m_novram->store(0);
+}
+
+void visual50_state::machine_start()
+{
+}
+
+void visual50_state::machine_reset()
+{
+}
+
+
+//**************************************************************************
+// MACHINE DEFINITIONS
+//**************************************************************************
+
+void visual50_state::visual50(machine_config &config)
+{
+ Z80(config, m_maincpu, 17.320_MHz_XTAL / 8); // divider not verified
+ m_maincpu->set_addrmap(AS_PROGRAM, &visual50_state::mem_map);
+ m_maincpu->set_addrmap(AS_IO, &visual50_state::io_map);
+
+ INPUT_MERGER_ANY_HIGH(config, "mainirq").output_handler().set_inputline(m_maincpu, INPUT_LINE_IRQ0);
+
+ X2210(config, m_novram);
+
+ PIT8253(config, m_pit, 0);
+ m_pit->set_clk<0>(17.320_MHz_XTAL / 8);
+ m_pit->set_clk<1>(17.320_MHz_XTAL / 8);
+ m_pit->set_clk<2>(17.320_MHz_XTAL / 8);
+ m_pit->out_handler<0>().set(m_usart[0], FUNC(i8251_device::write_rxc)); // or txc?
+ m_pit->out_handler<1>().set(m_usart[1], FUNC(i8251_device::write_rxc));
+ m_pit->out_handler<1>().append(m_usart[1], FUNC(i8251_device::write_txc));
+ m_pit->out_handler<2>().set(m_usart[0], FUNC(i8251_device::write_txc)); // or rxc?
+
+ i8255_device &ppi(I8255(config, "ppi"));
+ ppi.out_pa_callback().set(FUNC(visual50_state::ppi_porta_w));
+ ppi.out_pb_callback().set(FUNC(visual50_state::ppi_portb_w));
+ ppi.out_pc_callback().set(FUNC(visual50_state::ppi_portc_w));
+
+ SCREEN(config, m_screen, SCREEN_TYPE_RASTER);
+ m_screen->set_raw(17.320_MHz_XTAL, 900, 0, 720, 321, 0, 300);
+ m_screen->set_screen_update(m_pvtc, FUNC(scn2672_device::screen_update));
+
+ PALETTE(config, m_palette, palette_device::MONOCHROME_HIGHLIGHT);
+
+ GFXDECODE(config, "gfxdecode", m_palette, chars);
+
+ SCN2672(config, m_pvtc, 17.320_MHz_XTAL / 9);
+ m_pvtc->intr_callback().set_inputline(m_maincpu, INPUT_LINE_NMI);
+ m_pvtc->set_screen("screen");
+ m_pvtc->set_character_width(9);
+ m_pvtc->set_display_callback(FUNC(visual50_state::draw_character));
+ m_pvtc->set_addrmap(0, &visual50_state::char_map);
+
+ // modem port
+ I8251(config, m_usart[0], 17.320_MHz_XTAL / 8); // divider not verified
+ m_usart[0]->rxrdy_handler().set("mainirq", FUNC(input_merger_device::in_w<0>));
+ m_usart[0]->txd_handler().set("modem", FUNC(rs232_port_device::write_txd));
+ m_usart[0]->rts_handler().set("modem", FUNC(rs232_port_device::write_rts));
+
+ rs232_port_device &modem(RS232_PORT(config, "modem", default_rs232_devices, nullptr));
+ modem.rxd_handler().set(m_usart[0], FUNC(i8251_device::write_rxd));
+ modem.cts_handler().set(m_usart[0], FUNC(i8251_device::write_cts));
+
+ // keyboard
+ I8251(config, m_usart[1], 17.320_MHz_XTAL / 8); // divider not verified
+ m_usart[1]->rxrdy_handler().set("mainirq", FUNC(input_merger_device::in_w<1>));
+ m_usart[1]->txd_handler().set("kbd", FUNC(v50_kbd_device::rxd_w));
+
+ v50_kbd_device &kbd(V50_KBD(config, "kbd"));
+ kbd.txd_cb().set(m_usart[1], FUNC(i8251_device::write_rxd));
+ kbd.cts_cb().set(m_usart[1], FUNC(i8251_device::write_cts));
+}
+
+
+//**************************************************************************
+// ROM DEFINITIONS
+//**************************************************************************
+
+ROM_START( visual50 )
+ ROM_REGION(0x3000, "maincpu", 0)
+ ROM_DEFAULT_BIOS("r11")
+ ROM_SYSTEM_BIOS(0, "r08", "Revision 0.08")
+ ROMX_LOAD("e244-012_r08.u2", 0x0000, 0x2000, CRC(3931796d) SHA1(1f71b977e021a2f5eb5437c4056991cc7601768b), ROM_BIOS(0))
+ ROMX_LOAD("e262-055_r08.u3", 0x2000, 0x1000, CRC(20067dc0) SHA1(bf8051117876246b3c3ba88c1c750e146800ca0b), ROM_BIOS(0))
+ ROM_SYSTEM_BIOS(1, "r11", "Revision 0.11")
+ ROMX_LOAD("e244-012_r11.u2", 0x0000, 0x2000, CRC(755f0722) SHA1(80b90882c52c9ddcc1cf455c9195d4e1ccda8ce8), ROM_BIOS(1))
+ ROMX_LOAD("e262-055_r11.u3", 0x2000, 0x1000, CRC(90a142e8) SHA1(5f4c403b7ab09dcb3cfdc8f57f65e0a52992feed), ROM_BIOS(1))
+
+ ROM_REGION(0x800, "chargen", 0)
+ ROM_LOAD("ic240-001r00.u32", 0x000, 0x800, CRC(5041acd0) SHA1(ef3d952140c33c6cf2712463b53e8fca4a5400f4))
+ROM_END
+
+
+} // anonymous namespace
+
+
+//**************************************************************************
+// SYSTEM DRIVERS
+//**************************************************************************
+
+// YEAR NAME PARENT COMPAT MACHINE INPUT CLASS INIT COMPANY FULLNAME FLAGS
+COMP( 1983, visual50, 0, 0, visual50, visual50, visual50_state, empty_init, "Visual Technology", "Visual 50", MACHINE_IMPERFECT_GRAPHICS | MACHINE_SUPPORTS_SAVE )