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Diffstat (limited to 'src/mame/visual/v50.cpp')
-rw-r--r-- | src/mame/visual/v50.cpp | 366 |
1 files changed, 366 insertions, 0 deletions
diff --git a/src/mame/visual/v50.cpp b/src/mame/visual/v50.cpp new file mode 100644 index 00000000000..ad588d5808a --- /dev/null +++ b/src/mame/visual/v50.cpp @@ -0,0 +1,366 @@ +// 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 ) |