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Diffstat (limited to 'src/mame/drivers/ax20.c')
-rw-r--r--src/mame/drivers/ax20.c158
1 files changed, 158 insertions, 0 deletions
diff --git a/src/mame/drivers/ax20.c b/src/mame/drivers/ax20.c
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+++ b/src/mame/drivers/ax20.c
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+// license:BSD-3-Clause
+// copyright-holders:Sandro Ronco
+/***************************************************************************
+
+ Axel AX-20
+
+ 27/12/2011 Skeleton driver.
+
+ Hardware description:
+ - CPU: I8088
+ - FDC: I8272
+ - PIT: I8253
+ - PIC: I8259
+
+ Also marketed under the Matra brand as MAX-20 ("M" for Matra ?)
+
+****************************************************************************/
+
+#include "emu.h"
+#include "cpu/i86/i86.h"
+#include "bus/isa/fdc.h"
+
+class ax20_state : public driver_device
+{
+public:
+ ax20_state(const machine_config &mconfig, device_type type, const char *tag)
+ : driver_device(mconfig, type, tag),
+ m_maincpu(*this, "maincpu"),
+ m_p_vram(*this, "p_vram"),
+ m_gfxdecode(*this, "gfxdecode"),
+ m_palette(*this, "palette"),
+ m_fdc(*this, "fdc") { }
+
+ required_device<cpu_device> m_maincpu;
+ required_shared_ptr<UINT8> m_p_vram;
+ required_device<gfxdecode_device> m_gfxdecode;
+ required_device<palette_device> m_palette;
+ required_device<i8272a_device> m_fdc;
+
+ virtual void machine_start();
+ UINT32 screen_update(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect);
+
+ DECLARE_READ8_MEMBER(unk_r);
+ DECLARE_WRITE8_MEMBER(tc_w);
+ DECLARE_WRITE8_MEMBER(ctl_w);
+};
+
+READ8_MEMBER(ax20_state::unk_r)
+{
+ return 0;
+}
+
+WRITE8_MEMBER(ax20_state::tc_w)
+{
+ m_fdc->tc_w((data & 0xf0) == 0xf0);
+}
+
+WRITE8_MEMBER(ax20_state::ctl_w)
+{
+ m_fdc->subdevice<floppy_connector>("0")->get_device()->mon_w(!(data & 1));
+}
+
+UINT32 ax20_state::screen_update(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect)
+{
+ for ( int y = 0; y < 24; y++ )
+ {
+ for ( int x = 0; x < 80; x++ )
+ {
+ UINT16 tile = m_p_vram[24 + y * 128 + x ] & 0x7f;
+
+ m_gfxdecode->gfx(0)->opaque(bitmap,cliprect, tile, 0, 0, 0, x*8, y*12);
+ }
+ }
+
+ return 0;
+}
+
+
+static ADDRESS_MAP_START(ax20_map, AS_PROGRAM, 8, ax20_state)
+ ADDRESS_MAP_UNMAP_HIGH
+ AM_RANGE(0x00000,0x1ffff) AM_RAM
+ AM_RANGE(0x20000,0x3ffff) AM_RAM //optional RAM
+ AM_RANGE(0xf0400,0xf0fff) AM_RAM AM_SHARE("p_vram")
+ AM_RANGE(0xff800,0xfffff) AM_ROM AM_REGION("ipl", 0)
+ADDRESS_MAP_END
+
+static ADDRESS_MAP_START(ax20_io, AS_IO, 8, ax20_state)
+ ADDRESS_MAP_UNMAP_HIGH
+ AM_RANGE(0xffc0, 0xffc0) AM_WRITE(tc_w)
+ AM_RANGE(0xffd0, 0xffd0) AM_WRITE(ctl_w)
+ AM_RANGE(0xffe0, 0xffe0) AM_READ(unk_r)
+ AM_RANGE(0xff80, 0xff81) AM_DEVICE("fdc", i8272a_device, map)
+ADDRESS_MAP_END
+
+/* Input ports */
+static INPUT_PORTS_START( ax20 )
+INPUT_PORTS_END
+
+
+void ax20_state::machine_start()
+{
+}
+
+static const gfx_layout ax20_charlayout =
+{
+ 8, 12,
+ 128,
+ 1,
+ { 0 },
+ { 4*8+7, 4*8+6, 4*8+5, 4*8+4, 4*8+3, 4*8+2, 4*8+1, 4*8+0 },
+ { 0*8, 1*8, 2*8, 3*8, 4*8, 5*8, 6*8, 7*8, 8*8, 8*9, 8*10, 8*11 },
+ 8*16
+};
+
+static GFXDECODE_START( ax20 )
+ GFXDECODE_ENTRY( "chargen", 0x0000, ax20_charlayout, 0, 1 )
+GFXDECODE_END
+
+static SLOT_INTERFACE_START( ax20_floppies )
+ SLOT_INTERFACE( "525dd", FLOPPY_525_DD )
+SLOT_INTERFACE_END
+
+static MACHINE_CONFIG_START( ax20, ax20_state )
+ /* basic machine hardware */
+ MCFG_CPU_ADD("maincpu", I8088, XTAL_14_31818MHz/3)
+ MCFG_CPU_PROGRAM_MAP(ax20_map)
+ MCFG_CPU_IO_MAP(ax20_io)
+
+ /* video hardware */
+ MCFG_SCREEN_ADD("screen", RASTER)
+ MCFG_SCREEN_REFRESH_RATE(50)
+ MCFG_SCREEN_VBLANK_TIME(ATTOSECONDS_IN_USEC(2500)) /* not accurate */
+ MCFG_SCREEN_UPDATE_DRIVER(ax20_state, screen_update)
+ MCFG_SCREEN_SIZE(80*8, 24*12)
+ MCFG_SCREEN_VISIBLE_AREA(0, 80*8-1, 0, 24*12-1)
+ MCFG_SCREEN_PALETTE("palette")
+ MCFG_GFXDECODE_ADD("gfxdecode", "palette", ax20)
+ MCFG_PALETTE_ADD_MONOCHROME_GREEN("palette")
+
+ MCFG_I8272A_ADD("fdc", true)
+
+ /* Devices */
+ MCFG_FLOPPY_DRIVE_ADD("fdc:0", ax20_floppies, "525dd", isa8_fdc_device::floppy_formats)
+MACHINE_CONFIG_END
+
+/* ROM definition */
+ROM_START( ax20 )
+ ROM_REGION( 0x0800, "ipl", 0 )
+ ROM_LOAD( "ax20-s.rom", 0x0000, 0x0800, CRC(f11f95b9) SHA1(59949332dd431fcf8211c2d556e1f49351e90750))
+
+ ROM_REGION( 0x4000, "chargen", 0 )
+ ROM_LOAD( "ax20-g.rom", 0x0000, 0x0800, CRC(90bcef80) SHA1(922067fd7316de9e69b9600c793ada5c87197eeb))
+ROM_END
+
+/* Driver */
+
+/* YEAR NAME PARENT COMPAT MACHINE INPUT INIT COMPANY FULLNAME FLAGS */
+COMP( 1982, ax20, 0, 0, ax20, ax20, driver_device, 0, "Axel", "AX-20", MACHINE_NOT_WORKING | MACHINE_NO_SOUND)