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Diffstat (limited to 'src/mame/drivers/mx2178.c')
-rw-r--r--src/mame/drivers/mx2178.c204
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diff --git a/src/mame/drivers/mx2178.c b/src/mame/drivers/mx2178.c
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+++ b/src/mame/drivers/mx2178.c
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+// 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 )