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author Dirk Best <mail@dirk-best.de>2024-03-19 13:34:55 +0100
committer Dirk Best <mail@dirk-best.de>2024-03-19 13:55:16 +0100
commitc4b4da6755e7edd72120e0445333111c648b8666 (patch)
tree5239d12066f102380279b270c9fa526a5be8a196
parentb79289eff789a4be60cc47d7423a665b4e8700fe (diff)
visual50: Main screen turn on
- Added dump of character generator ROM and Revision 0.08 firmware [Bitsavers] - Initial screen rendering, but missing most attributes - Implement keyboard [Dirk Best, Bitsavers] - Start documenting PPI connections Systems promoted to working --------------------------- Visual 50
-rw-r--r--src/mame/visual/v50.cpp144
-rw-r--r--src/mame/visual/v50_kbd.cpp262
-rw-r--r--src/mame/visual/v50_kbd.h62
3 files changed, 447 insertions, 21 deletions
diff --git a/src/mame/visual/v50.cpp b/src/mame/visual/v50.cpp
index 9dc73242e03..b238900af26 100644
--- a/src/mame/visual/v50.cpp
+++ b/src/mame/visual/v50.cpp
@@ -10,31 +10,34 @@
- D780C (Z80)
- 2764 and 2732 EPROM
- 2x TMM314APL-1 (1k RAM)
- - X2210D NOVRAM (64x4)
+ - X2210D NOVRAM (64x4) (X2210 for REV A)
- Intel P8253-5 PIT
- D8255AC-5 PPI
- 2x D8251AC USART
- - SCN2672A
+ - SCN2672A (SCN2672 N for REV A)
- 2673
- TMM2016P-2 (2k VRAM)
- C68100 IC240-001R00 (character generator?)
- 17.320 MHz XTAL
TODO:
- - Character generator ROM is undumped
- - Keyboard (also not dumped)
- - Screen rendering
+ - Screen attributes (reverse sometimes works)
+ - Smooth scroll
- Screen brightness control
- - PPI connections are unknown
+ - Most PPI connections are unknown
- AUX port
Notes:
- - PCB marked "PA015 REV B 1183"
+ - 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"
@@ -44,6 +47,7 @@
#include "machine/x2212.h"
#include "video/scn2674.h"
+#include "emupal.h"
#include "screen.h"
@@ -63,8 +67,11 @@ public:
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_usart(*this, "usart%u", 0U),
+ m_vram(*this, "vram"),
+ m_chargen(*this, "chargen")
{ }
void visual50(machine_config &config);
@@ -78,8 +85,11 @@ private:
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);
void io_map(address_map &map);
@@ -87,6 +97,10 @@ private:
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();
@@ -121,7 +135,7 @@ void visual50_state::io_map(address_map &map)
void visual50_state::char_map(address_map &map)
{
- map(0x000, 0x7ff).ram();
+ map(0x000, 0x7ff).ram().share("vram");
}
@@ -139,13 +153,82 @@ INPUT_PORTS_END
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())
@@ -190,7 +273,7 @@ void visual50_state::machine_reset()
//**************************************************************************
-// MACHINE DEFINTIONS
+// MACHINE DEFINITIONS
//**************************************************************************
void visual50_state::visual50(machine_config &config)
@@ -212,13 +295,19 @@ void visual50_state::visual50(machine_config &config)
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(config, "ppi");
+ 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_color(rgb_t::amber()); // unknown color
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");
@@ -226,19 +315,24 @@ void visual50_state::visual50(machine_config &config)
m_pvtc->set_display_callback(FUNC(visual50_state::draw_character));
m_pvtc->set_addrmap(0, &visual50_state::char_map);
- // mainport
+ // 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("mainport", FUNC(rs232_port_device::write_txd));
- m_usart[0]->rts_handler().set("mainport", FUNC(rs232_port_device::write_rts));
+ 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 &mainport(RS232_PORT(config, "mainport", default_rs232_devices, nullptr));
- mainport.rxd_handler().set(m_usart[0], FUNC(i8251_device::write_rxd));
- mainport.cts_handler().set(m_usart[0], FUNC(i8251_device::write_cts));
+ 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));
}
@@ -248,8 +342,16 @@ void visual50_state::visual50(machine_config &config)
ROM_START( visual50 )
ROM_REGION(0x3000, "maincpu", 0)
- ROM_LOAD("e244-012.bin", 0x0000, 0x2000, CRC(755f0722) SHA1(80b90882c52c9ddcc1cf455c9195d4e1ccda8ce8))
- ROM_LOAD("e262-055.bin", 0x2000, 0x1000, CRC(90a142e8) SHA1(5f4c403b7ab09dcb3cfdc8f57f65e0a52992feed))
+ 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
@@ -261,4 +363,4 @@ ROM_END
//**************************************************************************
// 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_NOT_WORKING | MACHINE_NO_SOUND )
+COMP( 1983, visual50, 0, 0, visual50, visual50, visual50_state, empty_init, "Visual Technology", "Visual 50", MACHINE_IMPERFECT_GRAPHICS | MACHINE_SUPPORTS_SAVE )
diff --git a/src/mame/visual/v50_kbd.cpp b/src/mame/visual/v50_kbd.cpp
new file mode 100644
index 00000000000..9aa52e80c13
--- /dev/null
+++ b/src/mame/visual/v50_kbd.cpp
@@ -0,0 +1,262 @@
+// license: BSD-3-Clause
+// copyright-holders: Dirk Best
+/***************************************************************************
+
+ Visual 50 Keyboard
+
+ Hardware:
+ - B125 20-08048-131 SMA3051 (hard to read)
+ - 48-300-007 XTAL (apparently that's 4.608 MHz)
+ - D2758 EPROM labeled "241"
+ - Buzzer
+
+ Notes:
+ - Key Tronic A65-02428-001 PCB-201A
+ - There is an alternate version using an 8048 with embedded ROM,
+ part number 20-08048-161
+
+***************************************************************************/
+
+#include "emu.h"
+#include "v50_kbd.h"
+#include "speaker.h"
+
+
+//**************************************************************************
+// TYPE DEFINITIONS
+//**************************************************************************
+
+DEFINE_DEVICE_TYPE(V50_KBD, v50_kbd_device, "v50_kbd", "Visual 50 Keyboard")
+
+v50_kbd_device::v50_kbd_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) :
+ device_t(mconfig, V50_KBD, tag, owner, 0U),
+ m_mcu(*this, "mcu"),
+ m_buzzer(*this, "buzzer"),
+ m_keys(*this, "row_%x", 0U),
+ m_txd_cb(*this),
+ m_cts_cb(*this)
+{
+}
+
+
+//**************************************************************************
+// ROM DEFINITIONS
+//**************************************************************************
+
+ROM_START( firmware )
+ ROM_REGION(0x400, "mcu", 0)
+ ROM_LOAD("241.bin", 0x000, 0x400, CRC(244ee196) SHA1(5224887097004894ab9f4876f3217f3da08801da))
+ROM_END
+
+const tiny_rom_entry *v50_kbd_device::device_rom_region() const
+{
+ return ROM_NAME( firmware );
+}
+
+
+//**************************************************************************
+// MACHINE DEFINITIONS
+//**************************************************************************
+
+void v50_kbd_device::device_add_mconfig(machine_config &config)
+{
+ I8048(config, m_mcu, 4.608_MHz_XTAL); // needed for the correct baud rate
+ m_mcu->p1_in_cb().set(FUNC(v50_kbd_device::p1_r));
+ m_mcu->p2_out_cb().set(FUNC(v50_kbd_device::p2_w));
+ m_mcu->prog_out_cb().set(FUNC(v50_kbd_device::prog_w));
+
+ SPEAKER(config, "mono").front_center();
+
+ BEEP(config, m_buzzer, 786); // unknown frequency
+ m_buzzer->add_route(ALL_OUTPUTS, "mono", 0.5);
+}
+
+
+//**************************************************************************
+// INPUT PORT DEFINITIONS
+//**************************************************************************
+
+static INPUT_PORTS_START( keyboard )
+ PORT_START("row_0")
+ PORT_BIT(0x01, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_RCONTROL) PORT_NAME("FUNCTION")
+ PORT_BIT(0x02, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_LSHIFT) PORT_CHAR(UCHAR_SHIFT_1) // or RSHIFT?
+ PORT_BIT(0x04, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_RSHIFT) PORT_CHAR(UCHAR_SHIFT_1) // or LSHIFT?
+ PORT_BIT(0x08, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_LCONTROL) PORT_CHAR(UCHAR_SHIFT_2)
+ PORT_BIT(0x10, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_CAPSLOCK) PORT_CHAR(UCHAR_MAMEKEY(CAPSLOCK))
+ PORT_BIT(0x20, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_COMMA_PAD) PORT_CHAR(UCHAR_MAMEKEY(COMMA_PAD))
+ PORT_BIT(0x40, IP_ACTIVE_LOW, IPT_UNUSED) // 94
+ PORT_BIT(0x80, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_DOWN) PORT_CHAR(UCHAR_MAMEKEY(DOWN)) PORT_NAME(u8"\u2193 AUX")
+
+ PORT_START("row_1")
+ PORT_BIT(0x01, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_9_PAD) PORT_CHAR(UCHAR_MAMEKEY(9_PAD))
+ PORT_BIT(0x02, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_MINUS_PAD) PORT_CHAR(UCHAR_MAMEKEY(MINUS_PAD))
+ PORT_BIT(0x04, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_PLUS_PAD) PORT_NAME("Keypad .")
+ PORT_BIT(0x08, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_ENTER_PAD) PORT_CHAR(UCHAR_MAMEKEY(ENTER_PAD))
+ PORT_BIT(0x10, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_2_PAD) PORT_CHAR(UCHAR_MAMEKEY(2_PAD)) PORT_NAME("Keypad 2 CP")
+ PORT_BIT(0x20, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_5_PAD) PORT_CHAR(UCHAR_MAMEKEY(5_PAD)) PORT_NAME("Keypad 5 EL")
+ PORT_BIT(0x40, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_UP) PORT_CHAR(UCHAR_MAMEKEY(UP)) PORT_NAME(u8"\u2191 F3")
+ PORT_BIT(0x80, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_RIGHT) PORT_CHAR(UCHAR_MAMEKEY(RIGHT)) PORT_NAME(u8"\u2192 F2")
+
+ PORT_START("row_2")
+ PORT_BIT(0x01, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_BACKSPACE) PORT_CHAR(8)
+ PORT_BIT(0x02, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_CANCEL) PORT_NAME("BREAK")
+ PORT_BIT(0x04, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_0_PAD) PORT_CHAR(UCHAR_MAMEKEY(0_PAD))
+ PORT_BIT(0x08, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_6_PAD) PORT_CHAR(UCHAR_MAMEKEY(6_PAD)) PORT_NAME("Keypad 6 EP")
+ PORT_BIT(0x10, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_3_PAD) PORT_CHAR(UCHAR_MAMEKEY(3_PAD)) PORT_NAME("Keypad 3 DL")
+ PORT_BIT(0x20, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_DEL) PORT_CHAR(UCHAR_MAMEKEY(DEL))
+ PORT_BIT(0x40, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_LEFT) PORT_CHAR(UCHAR_MAMEKEY(LEFT)) PORT_NAME(u8"\u2190 F1")
+ PORT_BIT(0x80, IP_ACTIVE_LOW, IPT_UNUSED) // f0
+
+ PORT_START("row_3")
+ PORT_BIT(0x01, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_7_PAD) PORT_CHAR(UCHAR_MAMEKEY(7_PAD))
+ PORT_BIT(0x02, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_8_PAD) PORT_CHAR(UCHAR_MAMEKEY(8_PAD)) PORT_NAME("Keypad 8 HM")
+ PORT_BIT(0x04, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CHAR(10) PORT_NAME("LINE FEED")
+ PORT_BIT(0x08, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_4_PAD) PORT_CHAR(UCHAR_MAMEKEY(4_PAD)) PORT_NAME("Keypad 4 EF")
+ PORT_BIT(0x10, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_1_PAD) PORT_CHAR(UCHAR_MAMEKEY(1_PAD)) PORT_NAME("Keypad 1 IL")
+ PORT_BIT(0x20, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_O) PORT_CHAR('o') PORT_CHAR('O')
+ PORT_BIT(0x40, IP_ACTIVE_LOW, IPT_UNUSED) // ec
+ PORT_BIT(0x80, IP_ACTIVE_LOW, IPT_UNUSED) // e8
+
+ PORT_START("row_4")
+ PORT_BIT(0x01, IP_ACTIVE_LOW, IPT_UNUSED) // 98
+ PORT_BIT(0x02, IP_ACTIVE_LOW, IPT_UNUSED) // 9c
+ PORT_BIT(0x04, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_L) PORT_CHAR('l') PORT_CHAR('L')
+ PORT_BIT(0x08, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_SPACE) PORT_CHAR(' ')
+ PORT_BIT(0x10, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_ENTER) PORT_CHAR(13)
+ PORT_BIT(0x20, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_U) PORT_CHAR('u') PORT_CHAR('U')
+ PORT_BIT(0x40, IP_ACTIVE_LOW, IPT_UNUSED) // e4
+ PORT_BIT(0x80, IP_ACTIVE_LOW, IPT_UNUSED) // e0
+
+ PORT_START("row_5")
+ PORT_BIT(0x01, IP_ACTIVE_LOW, IPT_UNUSED) // 00
+ PORT_BIT(0x02, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_N) PORT_CHAR('n') PORT_CHAR('N')
+ PORT_BIT(0x04, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_J) PORT_CHAR('j') PORT_CHAR('J')
+ PORT_BIT(0x08, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_P) PORT_CHAR('p') PORT_CHAR('P')
+ PORT_BIT(0x10, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_K) PORT_CHAR('k') PORT_CHAR('K')
+ PORT_BIT(0x20, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_T) PORT_CHAR('t') PORT_CHAR('T')
+ PORT_BIT(0x40, IP_ACTIVE_LOW, IPT_UNUSED) // dc
+ PORT_BIT(0x80, IP_ACTIVE_LOW, IPT_UNUSED) // d8
+
+ PORT_START("row_6")
+ PORT_BIT(0x01, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_B) PORT_CHAR('b') PORT_CHAR('B')
+ PORT_BIT(0x02, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_V) PORT_CHAR('v') PORT_CHAR('V')
+ PORT_BIT(0x04, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_G) PORT_CHAR('g') PORT_CHAR('G')
+ PORT_BIT(0x08, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_I) PORT_CHAR('i') PORT_CHAR('I')
+ PORT_BIT(0x10, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_H) PORT_CHAR('h') PORT_CHAR('H')
+ PORT_BIT(0x20, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_E) PORT_CHAR('e') PORT_CHAR('E')
+ PORT_BIT(0x40, IP_ACTIVE_LOW, IPT_UNUSED) // d4
+ PORT_BIT(0x80, IP_ACTIVE_LOW, IPT_UNUSED) // d0
+
+ PORT_START("row_7")
+ PORT_BIT(0x01, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_C) PORT_CHAR('c') PORT_CHAR('C')
+ PORT_BIT(0x02, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_X) PORT_CHAR('x') PORT_CHAR('X')
+ PORT_BIT(0x04, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_D) PORT_CHAR('d') PORT_CHAR('D')
+ PORT_BIT(0x08, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_R) PORT_CHAR('r') PORT_CHAR('R')
+ PORT_BIT(0x10, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_F) PORT_CHAR('f') PORT_CHAR('F')
+ PORT_BIT(0x20, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_TAB) PORT_CHAR(9)
+ PORT_BIT(0x40, IP_ACTIVE_LOW, IPT_UNUSED) // cc
+ PORT_BIT(0x80, IP_ACTIVE_LOW, IPT_UNUSED) // c8
+
+ PORT_START("row_8")
+ PORT_BIT(0x01, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_7) PORT_CHAR('7') PORT_CHAR('&')
+ PORT_BIT(0x02, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_8) PORT_CHAR('8') PORT_CHAR('*')
+ PORT_BIT(0x04, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_SLASH) PORT_CHAR('/') PORT_CHAR('?')
+ PORT_BIT(0x08, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_NAME("NO SCROLL")
+ PORT_BIT(0x10, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_S) PORT_CHAR('s') PORT_CHAR('S')
+ PORT_BIT(0x20, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_ESC) PORT_CHAR(UCHAR_MAMEKEY(ESC))
+ PORT_BIT(0x40, IP_ACTIVE_LOW, IPT_UNUSED) // c4
+ PORT_BIT(0x80, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_LALT) PORT_NAME("SET-UP")
+
+ PORT_START("row_9")
+ PORT_BIT(0x01, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_5) PORT_CHAR('5') PORT_CHAR('%')
+ PORT_BIT(0x02, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_6) PORT_CHAR('6') PORT_CHAR('^')
+ PORT_BIT(0x04, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_STOP) PORT_CHAR('.') PORT_CHAR('>')
+ PORT_BIT(0x08, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_TILDE) PORT_CHAR('`') PORT_CHAR('~')
+ PORT_BIT(0x10, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_BACKSLASH) PORT_CHAR('\\') PORT_CHAR('|')
+ PORT_BIT(0x20, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_QUOTE) PORT_CHAR('\'') PORT_CHAR('"')
+ PORT_BIT(0x40, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_EQUALS) PORT_CHAR('=') PORT_CHAR('+')
+ PORT_BIT(0x80, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_Y) PORT_CHAR('y') PORT_CHAR('Y')
+
+ PORT_START("row_a")
+ PORT_BIT(0x01, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_3) PORT_CHAR('3') PORT_CHAR('#')
+ PORT_BIT(0x02, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_4) PORT_CHAR('4') PORT_CHAR('$')
+ PORT_BIT(0x04, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_COMMA) PORT_CHAR(',') PORT_CHAR('<')
+ PORT_BIT(0x08, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_MINUS) PORT_CHAR('-') PORT_CHAR('_')
+ PORT_BIT(0x10, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_W) PORT_CHAR('w') PORT_CHAR('W')
+ PORT_BIT(0x20, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_COLON) PORT_CHAR(';') PORT_CHAR(':')
+ PORT_BIT(0x40, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_0) PORT_CHAR('0') PORT_CHAR(')')
+ PORT_BIT(0x80, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_CLOSEBRACE) PORT_CHAR(']') PORT_CHAR('}')
+
+ PORT_START("row_b")
+ PORT_BIT(0x01, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_1) PORT_CHAR('1') PORT_CHAR('!')
+ PORT_BIT(0x02, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_2) PORT_CHAR('2') PORT_CHAR('@')
+ PORT_BIT(0x04, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_M) PORT_CHAR('m') PORT_CHAR('M')
+ PORT_BIT(0x08, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_9) PORT_CHAR('9') PORT_CHAR('(')
+ PORT_BIT(0x10, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_Q) PORT_CHAR('q') PORT_CHAR('Q')
+ PORT_BIT(0x20, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_A) PORT_CHAR('a') PORT_CHAR('A')
+ PORT_BIT(0x40, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_Z) PORT_CHAR('z') PORT_CHAR('Z')
+ PORT_BIT(0x80, IP_ACTIVE_LOW, IPT_KEYBOARD) PORT_CODE(KEYCODE_OPENBRACE) PORT_CHAR('[') PORT_CHAR('{')
+
+ PORT_START("row_c")
+ PORT_BIT(0xff, 0xff, IPT_UNUSED)
+
+ PORT_START("row_d")
+ PORT_BIT(0xff, 0xff, IPT_UNUSED)
+
+ PORT_START("row_e")
+ PORT_BIT(0xff, 0xff, IPT_UNUSED)
+
+ PORT_START("row_f")
+ PORT_BIT(0xff, 0xff, IPT_UNUSED)
+INPUT_PORTS_END
+
+ioport_constructor v50_kbd_device::device_input_ports() const
+{
+ return INPUT_PORTS_NAME( keyboard );
+}
+
+
+//**************************************************************************
+// MACHINE EMULATION
+//**************************************************************************
+
+void v50_kbd_device::device_start()
+{
+ // register for save states
+ save_item(NAME(m_prog));
+ save_item(NAME(m_key_row));
+}
+
+void v50_kbd_device::device_reset()
+{
+ // always use external rom
+ m_mcu->set_input_line(MCS48_INPUT_EA, CLEAR_LINE);
+
+ // signal we are connected to the host
+ m_cts_cb(0);
+}
+
+void v50_kbd_device::rxd_w(int state)
+{
+ m_mcu->set_input_line(MCS48_INPUT_IRQ, state ? CLEAR_LINE : ASSERT_LINE);
+}
+
+uint8_t v50_kbd_device::p1_r()
+{
+ return m_keys[m_key_row]->read();
+}
+
+void v50_kbd_device::p2_w(uint8_t data)
+{
+ m_buzzer->set_state(BIT(~data, 6));
+ m_txd_cb(BIT(data, 7));
+}
+
+void v50_kbd_device::prog_w(int state)
+{
+ // set new keyboard row from p2 on transition 0->1
+ if (!m_prog && bool(state))
+ m_key_row = m_mcu->p2_r() & 0x0f;
+
+ m_prog = bool(state);
+}
diff --git a/src/mame/visual/v50_kbd.h b/src/mame/visual/v50_kbd.h
new file mode 100644
index 00000000000..9d2a3584c33
--- /dev/null
+++ b/src/mame/visual/v50_kbd.h
@@ -0,0 +1,62 @@
+// license: BSD-3-Clause
+// copyright-holders: Dirk Best
+/***************************************************************************
+
+ Visual 50 Keyboard
+
+***************************************************************************/
+
+#ifndef MAME_VISUAL_V50_KBD_H
+#define MAME_VISUAL_V50_KBD_H
+
+#pragma once
+
+#include "cpu/mcs48/mcs48.h"
+#include "sound/beep.h"
+
+
+//**************************************************************************
+// TYPE DEFINITIONS
+//**************************************************************************
+
+class v50_kbd_device : public device_t
+{
+public:
+ // construction/destruction
+ v50_kbd_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock = 0);
+
+ // callbacks
+ auto txd_cb() { return m_txd_cb.bind(); }
+ auto cts_cb() { return m_cts_cb.bind(); }
+
+ // from host
+ void rxd_w(int state);
+
+protected:
+ // device_t overrides
+ virtual const tiny_rom_entry *device_rom_region() const override;
+ virtual void device_add_mconfig(machine_config &config) override;
+ virtual ioport_constructor device_input_ports() const override;
+ virtual void device_start() override;
+ virtual void device_reset() override;
+
+private:
+ required_device<i8048_device> m_mcu;
+ required_device<beep_device> m_buzzer;
+ required_ioport_array<16> m_keys;
+
+ devcb_write_line m_txd_cb;
+ devcb_write_line m_cts_cb;
+
+ bool m_prog = true;
+ uint8_t m_key_row = 0x0f;
+
+ uint8_t p1_r();
+ void p2_w(uint8_t data);
+ void prog_w(int state);
+};
+
+// device type definition
+DECLARE_DEVICE_TYPE(V50_KBD, v50_kbd_device)
+
+#endif // MAME_VISUAL_V50_KBD_H