// license:BSD-3-Clause // copyright-holders: /*********************************************************************************************************************************** 2017-11-20 Skeleton LSI M3 From disassembly: chips: Z80, 6845, 8251, 2x 8255, Z80CTC ************************************************************************************************************************************/ #include "emu.h" #include "cpu/z80/z80.h" #include "video/mc6845.h" #include "emupal.h" #include "screen.h" class m3_state : public driver_device { public: m3_state(const machine_config &mconfig, device_type type, const char *tag) : driver_device(mconfig, type, tag) , m_maincpu(*this, "maincpu") , m_p_chargen(*this, "chargen") , m_p_videoram(*this, "videoram") , m_palette(*this, "palette") { } void m3(machine_config &config); private: MC6845_UPDATE_ROW(crtc_update_row); void io_map(address_map &map); void mem_map(address_map &map); virtual void machine_reset() override; required_device m_maincpu; required_region_ptr m_p_chargen; required_shared_ptr m_p_videoram; required_device m_palette; }; void m3_state::mem_map(address_map &map) { map(0x0000, 0xe7ff).ram(); map(0xe800, 0xefff).ram().share("videoram"); map(0xf000, 0xffff).rom().region("roms", 0); } void m3_state::io_map(address_map &map) { map.global_mask(0xff); map(0x84, 0x84).rw("crtc", FUNC(mc6845_device::status_r), FUNC(mc6845_device::address_w)); map(0x85, 0x85).rw("crtc", FUNC(mc6845_device::register_r), FUNC(mc6845_device::register_w)); } static INPUT_PORTS_START( m3 ) INPUT_PORTS_END MC6845_UPDATE_ROW( m3_state::crtc_update_row ) { const rgb_t *pens = m_palette->palette()->entry_list_raw(); uint8_t chr,gfx,inv; uint16_t mem,x; uint32_t *p = &bitmap.pix32(y); for (x = 0; x < x_count; x++) { inv = (x == cursor_x) ? 0xff : 0; mem = (ma + x) & 0x7ff; chr = m_p_videoram[mem]; if (BIT(chr, 7)) { inv ^= 0xff; chr &= 0x7f; } /* get pattern of pixels for that character scanline */ gfx = m_p_chargen[(chr<<4) | ra] ^ inv; /* Display a scanline of a character (8 pixels) */ *p++ = pens[BIT(gfx, 6)]; *p++ = pens[BIT(gfx, 5)]; *p++ = pens[BIT(gfx, 4)]; *p++ = pens[BIT(gfx, 3)]; *p++ = pens[BIT(gfx, 2)]; *p++ = pens[BIT(gfx, 1)]; *p++ = pens[BIT(gfx, 0)]; } } /* F4 Character Displayer */ static const gfx_layout charlayout = { 7, 16, /* 7 x 16 characters */ 128, /* 128 characters */ 1, /* 1 bits per pixel */ { 0 }, /* no bitplanes */ /* x offsets */ { 1, 2, 3, 4, 5, 6, 7 }, /* y offsets */ { 0, 8, 2*8, 3*8, 4*8, 5*8, 6*8, 7*8, 8*8, 9*8 }, 8*16 /* every char takes 16 bytes */ }; static GFXDECODE_START( gfx_f4disp ) GFXDECODE_ENTRY( "chargen", 0x0000, charlayout, 0, 1 ) GFXDECODE_END void m3_state::machine_reset() { m_maincpu->set_pc(0xf000); } void m3_state::m3(machine_config &config) { Z80(config, m_maincpu, 2'000'000); // no idea of clock. m_maincpu->set_addrmap(AS_PROGRAM, &m3_state::mem_map); m_maincpu->set_addrmap(AS_IO, &m3_state::io_map); /* video hardware */ screen_device &screen(SCREEN(config, "screen", SCREEN_TYPE_RASTER, rgb_t::green())); screen.set_refresh_hz(60); screen.set_vblank_time(ATTOSECONDS_IN_USEC(2500)); // not correct screen.set_screen_update("crtc", FUNC(mc6845_device::screen_update)); screen.set_size(640, 480); screen.set_visarea(0, 639, 0, 479); GFXDECODE(config, "gfxdecode", m_palette, gfx_f4disp); PALETTE(config, m_palette, palette_device::MONOCHROME); /* Devices */ mc6845_device &crtc(MC6845(config, "crtc", 2'000'000)); // clk unknown crtc.set_screen("screen"); crtc.set_show_border_area(false); crtc.set_char_width(7); crtc.set_update_row_callback(FUNC(m3_state::crtc_update_row)); } ROM_START( m3 ) ROM_REGION( 0x3000, "roms", 0 ) ROM_LOAD( "bootstrap_prom,034.bin", 0x0000, 0x0800, CRC(7fdb051e) SHA1(7aa24d4f44b6a0c8f7f647667f4997432c186cac) ) ROM_LOAD( "monitor_prom_v1.7_2015-12-09.bin", 0x0800, 0x0800, CRC(85b5c541) SHA1(92b4ec87a4d0d8c0f7b49eec0c5457f237de0a01) ) ROM_REGION( 0x0800, "chargen", 0 ) // bit 7 set on every byte - bad? ROM_LOAD( "6845crt_font_prom,033.bin", 0x0000, 0x0800, CRC(cc29f664) SHA1(4197530d9455d665fd4773f95bb6394f6b056dec) ) ROM_REGION( 0x0800, "keyboard", 0 ) ROM_LOAD( "keyboard_prom,032.bin", 0x0000, 0x0800, CRC(21548355) SHA1(ee4ce4af9c78474263dd58e0f19e79e5b00926fa) ) ROM_END COMP( 19??, m3, 0, 0, m3, m3, m3_state, empty_init, "LSI", "M3", MACHINE_IS_SKELETON )