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https://github.com/holub/mame
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LB-4 : hooked up some devices and the video.
This commit is contained in:
Robbbert
parent
20f4ace3b3
commit
b7219e3db5
@ -1,5 +1,5 @@
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// license:BSD-3-Clause
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// copyright-holders:Ryan Holtz
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// copyright-holders:Ryan Holtz, Robbbert
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/****************************************************************************
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Liberty Electronics LB-4 serial terminal
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@ -11,6 +11,14 @@
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- Zilog Z8430 CTC
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- 16.6698MHz Crystal
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Not sure what's going on here... the ACIA only has one serial channel,
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is it for the host, the printer, or the keyboard? There's no real
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evidence of a keyboard in the photos, so perhaps it's a display-only
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unit with printer. If so, then Rx is from the host, and Tx is to the
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printer.
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If baudrate == 9600, then MASTER_CLOCK / 18 goes to CTC, it divides by
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6 to the ACIA, which divides by 16, to give roughly 9600.
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****************************************************************************/
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#include "emu.h"
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@ -20,6 +28,7 @@
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#include "video/mc6845.h"
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#include "screen.h"
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#include "emupal.h"
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#include "bus/rs232/rs232.h"
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#define MASTER_CLOCK 16.6698_MHz_XTAL
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@ -34,12 +43,15 @@ public:
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, m_crtc(*this, "crtc")
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, m_gfxdecode(*this, "gfxdecode")
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, m_palette(*this, "palette")
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, m_p_videoram(*this, "videoram")
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, m_p_chargen(*this, "chargen")
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{ }
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void lb4(machine_config &config);
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private:
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void mem_map(address_map &map);
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MC6845_UPDATE_ROW(crtc_update_row);
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required_device<m6800_cpu_device> m_maincpu;
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required_device<acia6850_device> m_acia;
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@ -47,57 +59,114 @@ private:
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required_device<h46505_device> m_crtc;
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required_device<gfxdecode_device> m_gfxdecode;
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required_device<palette_device> m_palette;
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required_shared_ptr<uint8_t> m_p_videoram;
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required_region_ptr<u8> m_p_chargen;
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};
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void lb4_state::mem_map(address_map &map)
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{
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// There are what look like RAM reads/writes from 0000-03ff, but also accesses which look like attempts to talk to a device.
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map(0x4000, 0x47ff).ram();
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map(0x8000, 0x8000).w(m_crtc, FUNC(mc6845_device::address_w));
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map(0x8001, 0x8001).w(m_crtc, FUNC(mc6845_device::register_w));
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map(0x0000, 0x03ff).ram();
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map(0x2800, 0x2803).rw(m_ctc, FUNC(z80ctc_device::read), FUNC(z80ctc_device::write));
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//map(0x3800, 0x3800).w // many writes of 43 and C3
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map(0x4000, 0x47ff).ram().share("videoram");
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map(0x8000, 0x8000).rw(m_crtc, FUNC(mc6845_device::status_r), FUNC(mc6845_device::address_w));
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map(0x8001, 0x8001).rw(m_crtc, FUNC(mc6845_device::register_r), FUNC(mc6845_device::register_w));
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map(0x9800, 0x9801).rw(m_acia, FUNC(acia6850_device::read), FUNC(acia6850_device::write));
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map(0xe000, 0xffff).rom().region("maincpu", 0);
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}
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MC6845_UPDATE_ROW(lb4_state::crtc_update_row)
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{
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const rgb_t *palette = m_palette->palette()->entry_list_raw();
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u8 chr,gfx,inv;
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u16 mem,x;
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u32 *p = &bitmap.pix32(y);
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for (x = 0; x < x_count; x++)
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{
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mem = (ma + x) & 0x7ff;
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chr = m_p_videoram[mem];
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inv = ((x == cursor_x) ^ BIT(chr, 7)) ? 0xff : 0;
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gfx = m_p_chargen[(chr<<4) | ra] ^ inv;
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/* Display a scanline of a character (8 pixels) */
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*p++ = palette[BIT(gfx, 7)];
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*p++ = palette[BIT(gfx, 6)];
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*p++ = palette[BIT(gfx, 5)];
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*p++ = palette[BIT(gfx, 4)];
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*p++ = palette[BIT(gfx, 3)];
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*p++ = palette[BIT(gfx, 2)];
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*p++ = palette[BIT(gfx, 1)];
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*p++ = palette[BIT(gfx, 0)];
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}
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}
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static const gfx_layout char_layout =
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{
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8,16,
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8,12,
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RGN_FRAC(1,1),
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1,
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{ 0 },
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{ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 },
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{ 0*8, 1*8, 2*8, 3*8, 4*8, 5*8, 6*8, 7*8, 8*8, 9*8, 10*8, 11*8, 12*8, 13*8, 14*8, 15*8 },
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{ 0, 1, 2, 3, 4, 5, 6, 7 },
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{ 0*8, 1*8, 2*8, 3*8, 4*8, 5*8, 6*8, 7*8, 8*8, 9*8, 10*8, 11*8 },
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8*16
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};
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static GFXDECODE_START(chars)
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GFXDECODE_ENTRY("chars", 0, char_layout, 0, 1)
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GFXDECODE_ENTRY("chargen", 0, char_layout, 0, 1)
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GFXDECODE_END
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void lb4_state::lb4(machine_config &config)
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{
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//void lb4_state::lb4(machine_config &config)
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//{
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MACHINE_CONFIG_START(lb4_state::lb4)
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// All dividers unknown/guessed
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M6800(config, m_maincpu, MASTER_CLOCK / 16);
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m_maincpu->set_addrmap(AS_PROGRAM, &lb4_state::mem_map);
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ACIA6850(config, m_acia, MASTER_CLOCK / 128);
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/* video hardware */
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MCFG_SCREEN_ADD_MONOCHROME("screen", RASTER, rgb_t::green())
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MCFG_SCREEN_REFRESH_RATE(50)
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MCFG_SCREEN_VBLANK_TIME(ATTOSECONDS_IN_USEC(2500)) /* not accurate */
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MCFG_SCREEN_SIZE(640, 480)
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MCFG_SCREEN_VISIBLE_AREA(0, 640-1, 0, 480-1)
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MCFG_SCREEN_UPDATE_DEVICE("crtc", mc6845_device, screen_update)
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MCFG_PALETTE_ADD_MONOCHROME("palette")
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//PALETTE(config, m_palette, 2).set_init("palette", FUNC(palette_device::palette_init_monochrome));
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MCFG_DEVICE_ADD("gfxdecode", GFXDECODE, "palette", chars)
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//GFXDECODE(config, m_gfxdecode, m_palette, chars);
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//H46505(config, m_crtc, MASTER_CLOCK / 10);
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MCFG_MC6845_ADD("crtc", H46505, "screen", MASTER_CLOCK / 10)
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MCFG_MC6845_SHOW_BORDER_AREA(false)
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MCFG_MC6845_CHAR_WIDTH(8)
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MCFG_MC6845_UPDATE_ROW_CB(lb4_state, crtc_update_row)
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ACIA6850(config, m_acia, 0);
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m_acia->txd_handler().set("rs232", FUNC(rs232_port_device::write_txd));
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m_acia->rts_handler().set("rs232", FUNC(rs232_port_device::write_rts));
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rs232_port_device &rs232(RS232_PORT(config, "rs232", default_rs232_devices, nullptr));
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rs232.rxd_handler().set(m_acia, FUNC(acia6850_device::write_rxd));
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rs232.cts_handler().set(m_acia, FUNC(acia6850_device::write_cts));
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Z80CTC(config, m_ctc, MASTER_CLOCK / 4);
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m_ctc->set_clk<0>(MASTER_CLOCK / 18);
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m_ctc->zc_callback<0>().set(m_acia, FUNC(acia6850_device::write_txc));
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m_ctc->zc_callback<0>().append(m_acia, FUNC(acia6850_device::write_rxc));
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//}
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MACHINE_CONFIG_END
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H46505(config, m_crtc, MASTER_CLOCK);
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GFXDECODE(config, m_gfxdecode, m_palette, chars);
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PALETTE(config, m_palette, 2).set_init("palette", FUNC(palette_device::palette_init_monochrome));
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}
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static INPUT_PORTS_START( lb4 )
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INPUT_PORTS_END
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ROM_START( lb4 )
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ROM_REGION( 0x10000, "maincpu", 0 )
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ROM_REGION( 0x2000, "maincpu", 0 )
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ROM_LOAD( "u8.bin", 0x0000, 0x2000, CRC(2e375abc) SHA1(12ad1e49c5773c36c3a8d65845c9a50f9dec141f) )
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ROM_REGION( 0x1000, "chars", 0 )
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ROM_REGION( 0x1000, "chargen", 0 )
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ROM_LOAD( "u32.bin", 0x0000, 0x1000, CRC(f6d86e87) SHA1(c0885e4a35095a730d760bf91a1cf4e8edd6a2bb) )
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ROM_END
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