diff options
Diffstat (limited to 'src/mame/drivers/ax20.c')
-rw-r--r-- | src/mame/drivers/ax20.c | 158 |
1 files changed, 158 insertions, 0 deletions
diff --git a/src/mame/drivers/ax20.c b/src/mame/drivers/ax20.c new file mode 100644 index 00000000000..d5025a92952 --- /dev/null +++ b/src/mame/drivers/ax20.c @@ -0,0 +1,158 @@ +// 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) |