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Diffstat (limited to 'src/mame/drivers/mx2178.c')
-rw-r--r-- | src/mame/drivers/mx2178.c | 204 |
1 files changed, 204 insertions, 0 deletions
diff --git a/src/mame/drivers/mx2178.c b/src/mame/drivers/mx2178.c new file mode 100644 index 00000000000..a1fc4fb1a22 --- /dev/null +++ b/src/mame/drivers/mx2178.c @@ -0,0 +1,204 @@ +// 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 + - RS232 not working (6850 parameters are /64, 8 bit, 2 stop bit, IRQ when key pressed) + - Unknown port i/o 80 + - Unknown memory i/o C000, 4000 + - Need schematic / tech manual + - Gets stuck waiting for E011 to become zero somehow. If you skip that, a status line appears. + - Doesn't seem to be any dips, looks like all settings and modes are controlled by keystrokes. + +***************************************************************************************************/ + +#include "bus/rs232/rs232.h" +#include "cpu/z80/z80.h" +#include "video/mc6845.h" +#include "machine/6850acia.h" +#include "machine/clock.h" +#include "machine/keyboard.h" + +#define KEYBOARD_TAG "keyboard" + +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_p_videoram(*this, "videoram"), + m_maincpu(*this, "maincpu"), + m_acia(*this, "acia"), + m_palette(*this, "palette") + { + } + + DECLARE_READ8_MEMBER(keyin_r); + DECLARE_WRITE8_MEMBER(kbd_put); + DECLARE_WRITE_LINE_MEMBER(write_acia_clock); + MC6845_UPDATE_ROW(crtc_update_row); + + const UINT8 *m_p_chargen; + required_shared_ptr<UINT8> m_p_videoram; + +protected: + virtual void machine_reset(); + +private: + UINT8 m_term_data; + required_device<z80_device> m_maincpu; + required_device<acia6850_device> m_acia; +public: + required_device<palette_device> m_palette; +}; + +static ADDRESS_MAP_START(mx2178_mem, AS_PROGRAM, 8, mx2178_state) + ADDRESS_MAP_UNMAP_HIGH + AM_RANGE(0x0000, 0x1fff) AM_ROM AM_REGION("roms", 0) + AM_RANGE(0x2000, 0x27ff) AM_RAM AM_SHARE("videoram") + AM_RANGE(0x6000, 0x6fff) AM_RAM + AM_RANGE(0xe000, 0xe7ff) AM_RAM +ADDRESS_MAP_END + +static ADDRESS_MAP_START(mx2178_io, AS_IO, 8, mx2178_state) + ADDRESS_MAP_GLOBAL_MASK(0xff) + AM_RANGE(0x00, 0x00) AM_DEVWRITE("crtc", mc6845_device, address_w) + AM_RANGE(0x01, 0x01) AM_DEVREADWRITE("crtc", mc6845_device, register_r, register_w) + //AM_RANGE(0xa0, 0xa0) AM_DEVREADWRITE("acia", acia6850_device, status_r, control_w) + //AM_RANGE(0xa1, 0xa1) AM_DEVREADWRITE("acia", acia6850_device, data_r, data_w) + AM_RANGE(0xa0, 0xa1) AM_READ(keyin_r) +ADDRESS_MAP_END + + +/* Input ports */ +static INPUT_PORTS_START( mx2178 ) +INPUT_PORTS_END + +READ8_MEMBER( mx2178_state::keyin_r ) +{ + if (offset) + { + UINT8 ret = m_term_data; + m_term_data = 0; + return ret; + } + else + return (m_term_data) ? 0x83 : 0x82; +} + +WRITE8_MEMBER( mx2178_state::kbd_put ) +{ + m_term_data = data; + m_maincpu->set_input_line(0, HOLD_LINE); +} + +MC6845_UPDATE_ROW( mx2178_state::crtc_update_row ) +{ + const rgb_t *pens = m_palette->palette()->entry_list_raw(); + UINT8 chr,gfx; + UINT16 mem,x; + UINT32 *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( mx2178 ) + GFXDECODE_ENTRY( "chargen", 0x0000, mx2178_charlayout, 0, 1 ) +GFXDECODE_END + +void mx2178_state::machine_reset() +{ + m_p_chargen = memregion("chargen")->base(); +} + +WRITE_LINE_MEMBER(mx2178_state::write_acia_clock) +{ + m_acia->write_txc(state); + m_acia->write_rxc(state); +} + +static MACHINE_CONFIG_START( mx2178, mx2178_state ) + /* basic machine hardware */ + MCFG_CPU_ADD("maincpu", Z80, 18869600/5) // guess + MCFG_CPU_PROGRAM_MAP(mx2178_mem) + MCFG_CPU_IO_MAP(mx2178_io) + + /* video hardware */ + MCFG_SCREEN_ADD("screen", RASTER) + 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_GFXDECODE_ADD("gfxdecode", "palette", mx2178) + MCFG_PALETTE_ADD_MONOCHROME_GREEN("palette") + + /* Devices */ + MCFG_MC6845_ADD("crtc", MC6845, "screen", 18869600 / 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_DEVICE_ADD("acia", ACIA6850, 0) + + /// TODO: hook up acia to keyboard and memory map + + MCFG_DEVICE_ADD(KEYBOARD_TAG, GENERIC_KEYBOARD, 0) + MCFG_GENERIC_KEYBOARD_CB(WRITE8(mx2178_state, kbd_put)) + + MCFG_DEVICE_ADD("acia_clock", CLOCK, 614400) + MCFG_CLOCK_SIGNAL_HANDLER(WRITELINE(mx2178_state, write_acia_clock)) + +MACHINE_CONFIG_END + +/* ROM definition */ +ROM_START( mx2178 ) + ROM_REGION(0x2000, "roms", 0) + ROM_LOAD( "96274139.bin", 0x000000, 0x002000, CRC(eb471a27) SHA1(433abefd1a72653d0bf35bcaaeccf9943b96260b) ) + + ROM_REGION(0x1000, "chargen", 0) + ROM_LOAD( "96273883.bin", 0x000000, 0x001000, CRC(8311fadd) SHA1(573bbad23e893ad9374edc929642dc1cba3452d2) ) +ROM_END + +/* Driver */ + +/* YEAR NAME PARENT COMPAT MACHINE INPUT STATE INIT COMPANY FULLNAME FLAGS */ +COMP( 1984, mx2178, 0, 0, mx2178, mx2178, driver_device, 0, "Memorex", "Memorex 2178", MACHINE_IS_SKELETON ) |