// 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 m_maincpu; required_shared_ptr m_p_vram; required_device m_gfxdecode; required_device m_palette; required_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("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)