// license:BSD-3-Clause // copyright-holders:Robbbert /*************************************************************************************************** Skeleton driver for Memorex 2178 Chips: Z80A, N8X305N, 2x B8452A, 4x D4016C-3, 2x HD468A50P, HD46505SP-1 Crystal: 18.8696MHz There is a large piezo-beeper. TODO: - Connect up the beeper - Unknown memory i/o C000, 4000 - Need schematic / tech manual - Doesn't seem to be any dips, looks like all settings and modes are controlled by keystrokes. - 8X305 is a 16-bit bipolar processor which appears to use four external PROMs (undumped). It would communicate with the Z80 via a common 8-bit I/O bus. No idea what it is used for here, but in another system it acts as the floppy disk controller. - Debug trick: set pc=809 to see the test menu. - It shows the status line but keystrokes are ignored. After 20 minutes of inactivity, the screen goes blank. Pressing a key will restore it. ***************************************************************************************************/ #include "emu.h" #include "cpu/z80/z80.h" //#include "cpu/8x300/8x300.h" // device = N8X300 #include "machine/6850acia.h" #include "bus/rs232/rs232.h" #include "machine/clock.h" #include "video/mc6845.h" #include "screen.h" class mx2178_state : public driver_device { public: mx2178_state(const machine_config &mconfig, device_type type, const char *tag) : driver_device(mconfig, type, tag) , m_palette(*this, "palette") , m_p_videoram(*this, "videoram") , m_maincpu(*this, "maincpu") , m_p_chargen(*this, "chargen") { } MC6845_UPDATE_ROW(crtc_update_row); void mx2178(machine_config &config); void mx2178_io(address_map &map); void mx2178_mem(address_map &map); private: virtual void machine_reset() override; required_device m_palette; required_shared_ptr m_p_videoram; required_device m_maincpu; required_region_ptr m_p_chargen; }; void mx2178_state::mx2178_mem(address_map &map) { map.unmap_value_high(); map(0x0000, 0x1fff).rom().region("roms", 0); map(0x2000, 0x27ff).ram().share("videoram"); map(0x6000, 0x6fff).ram(); map(0xe000, 0xe7ff).ram(); } void mx2178_state::mx2178_io(address_map &map) { map.global_mask(0xff); map(0x00, 0x00).rw("crtc", FUNC(mc6845_device::status_r), FUNC(mc6845_device::address_w)); map(0x01, 0x01).rw("crtc", FUNC(mc6845_device::register_r), FUNC(mc6845_device::register_w)); map(0x80, 0x81).rw("acia1", FUNC(acia6850_device::read), FUNC(acia6850_device::write)); map(0xa0, 0xa1).rw("acia2", FUNC(acia6850_device::read), FUNC(acia6850_device::write)); } /* Input ports */ static INPUT_PORTS_START( mx2178 ) INPUT_PORTS_END MC6845_UPDATE_ROW( mx2178_state::crtc_update_row ) { const rgb_t *pens = m_palette->palette()->entry_list_raw(); uint8_t chr,gfx; uint16_t mem,x; uint32_t *p = &bitmap.pix32(y); for (x = 0; x < x_count; x++) { mem = (ma + x) & 0x7ff; chr = m_p_videoram[mem]; /* get pattern of pixels for that character scanline */ gfx = m_p_chargen[(chr<<4) | ra] ^ ((x == cursor_x) ? 0xff : 0); /* Display a scanline of a character (8 pixels) */ *p++ = pens[BIT(gfx, 7)]; *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 mx2178_charlayout = { 8, 16, /* 8 x 16 characters */ 256, /* 256 characters */ 1, /* 1 bits per pixel */ { 0 }, /* no bitplanes */ /* x offsets */ { 0, 1, 2, 3, 4, 5, 6, 7 }, /* y offsets */ { 3*8, 4*8, 5*8, 6*8, 7*8, 8*8, 9*8, 10*8, 11*8, 12*8, 13*8 }, 8*16 /* every char takes 8 bytes */ }; static GFXDECODE_START( gfx_mx2178 ) GFXDECODE_ENTRY( "chargen", 0x0000, mx2178_charlayout, 0, 1 ) GFXDECODE_END void mx2178_state::machine_reset() { } MACHINE_CONFIG_START(mx2178_state::mx2178) /* basic machine hardware */ MCFG_DEVICE_ADD("maincpu", Z80, XTAL(18'869'600) / 5) // guess MCFG_DEVICE_PROGRAM_MAP(mx2178_mem) MCFG_DEVICE_IO_MAP(mx2178_io) /* video hardware */ MCFG_SCREEN_ADD_MONOCHROME("screen", RASTER, rgb_t::green()) MCFG_SCREEN_REFRESH_RATE(60) MCFG_SCREEN_VBLANK_TIME(ATTOSECONDS_IN_USEC(2500)) // not correct MCFG_SCREEN_UPDATE_DEVICE("crtc", mc6845_device, screen_update) MCFG_SCREEN_SIZE(32*8, 32*8) MCFG_SCREEN_VISIBLE_AREA(0*8, 32*8-1, 2*8, 30*8-1) MCFG_DEVICE_ADD("gfxdecode", GFXDECODE, "palette", gfx_mx2178) MCFG_PALETTE_ADD_MONOCHROME("palette") /* Devices */ MCFG_MC6845_ADD("crtc", MC6845, "screen", XTAL(18'869'600) / 8) // clk unknown MCFG_MC6845_SHOW_BORDER_AREA(false) MCFG_MC6845_CHAR_WIDTH(8) MCFG_MC6845_UPDATE_ROW_CB(mx2178_state, crtc_update_row) MCFG_MC6845_OUT_VSYNC_CB(INPUTLINE("maincpu", INPUT_LINE_NMI)) MCFG_DEVICE_ADD("acia_clock", CLOCK, XTAL(18'869'600) / 30) MCFG_CLOCK_SIGNAL_HANDLER(WRITELINE("acia1", acia6850_device, write_txc)) MCFG_DEVCB_CHAIN_OUTPUT(WRITELINE("acia1", acia6850_device, write_rxc)) MCFG_DEVCB_CHAIN_OUTPUT(WRITELINE("acia2", acia6850_device, write_rxc)) MCFG_DEVCB_CHAIN_OUTPUT(WRITELINE("acia2", acia6850_device, write_rxc)) MCFG_DEVICE_ADD("acia1", ACIA6850, 0) MCFG_ACIA6850_TXD_HANDLER(WRITELINE("rs232a", rs232_port_device, write_txd)) MCFG_ACIA6850_RTS_HANDLER(WRITELINE("rs232a", rs232_port_device, write_rts)) MCFG_ACIA6850_IRQ_HANDLER(INPUTLINE("maincpu", INPUT_LINE_IRQ0)) MCFG_DEVICE_ADD("rs232a", RS232_PORT, default_rs232_devices, nullptr) MCFG_RS232_RXD_HANDLER(WRITELINE("acia1", acia6850_device, write_rxd)) MCFG_RS232_CTS_HANDLER(WRITELINE("acia1", acia6850_device, write_cts)) MCFG_DEVICE_ADD("acia2", ACIA6850, 0) MCFG_ACIA6850_TXD_HANDLER(WRITELINE("rs232b", rs232_port_device, write_txd)) MCFG_ACIA6850_RTS_HANDLER(WRITELINE("rs232b", rs232_port_device, write_rts)) MCFG_ACIA6850_IRQ_HANDLER(INPUTLINE("maincpu", INPUT_LINE_IRQ0)) MCFG_DEVICE_ADD("rs232b", RS232_PORT, default_rs232_devices, "keyboard") MCFG_RS232_RXD_HANDLER(WRITELINE("acia2", acia6850_device, write_rxd)) MCFG_RS232_CTS_HANDLER(WRITELINE("acia2", acia6850_device, write_cts)) MACHINE_CONFIG_END /* ROM definition */ ROM_START( mx2178 ) ROM_REGION(0x2000, "roms", 0) // MBM2764-25 ROM_LOAD( "96274139.u9", 0x000000, 0x002000, CRC(eb471a27) SHA1(433abefd1a72653d0bf35bcaaeccf9943b96260b) ) ROM_REGION(0x800, "proms", 0) // MB7122E - actual mapping not known ROMX_LOAD( "96270350.q2", 0x0000, 0x0400, NO_DUMP, ROM_NIBBLE | ROM_SHIFT_NIBBLE_LO | ROM_SKIP(1) ) ROMX_LOAD( "96270368.r2", 0x0000, 0x0400, NO_DUMP, ROM_NIBBLE | ROM_SHIFT_NIBBLE_HI | ROM_SKIP(1) ) ROMX_LOAD( "96270376.s2", 0x0001, 0x0400, NO_DUMP, ROM_NIBBLE | ROM_SHIFT_NIBBLE_LO | ROM_SKIP(1) ) ROMX_LOAD( "96270384.t2", 0x0001, 0x0400, NO_DUMP, ROM_NIBBLE | ROM_SHIFT_NIBBLE_HI | ROM_SKIP(1) ) ROM_REGION(0x1000, "chargen", 0) // D2732A-3 ROM_LOAD( "96273883.c7", 0x000000, 0x001000, CRC(8311fadd) SHA1(573bbad23e893ad9374edc929642dc1cba3452d2) ) ROM_END /* Driver */ // YEAR NAME PARENT COMPAT MACHINE INPUT CLASS INIT COMPANY FULLNAME FLAGS COMP( 1984, mx2178, 0, 0, mx2178, mx2178, mx2178_state, empty_init, "Memorex", "Memorex 2178", MACHINE_IS_SKELETON )