/*************************************************************************** Vegas 6809 Skeleton driver Devices: MC6809 cpu MC6840 timer MM58174 RTC MB8876 (or FD1791) FDC SY6545-1 CRTC 2x MC6821 PIA 2x MC6850 ACIA Memory ranges: 0000-EFFF RAM F000-F7FF Devices F800-FFFF ROM Monitor commands: D boot from floppy (launch Flex OS) F relaunch Flex G go M modify memory (. to exit) ToDo: - Colours (a photo shows colours but the schematic doesn't have any ram for colours). - Connect the devices (RTC, FDC, PIAs, ACIAs, timer). - Find the missing character generator rom. - Add mirrors to the address map. - Add sound. Pressing BEL character issues commands to the timer chip. - Replace terminal keyboard with proper plug-in unit (no info). ****************************************************************************/ #include "emu.h" #include "cpu/m6809/m6809.h" #include "video/mc6845.h" //#include "imagedev/flopdrv.h" //#include "machine/6821pia.h" //#include "machine/6850acia.h" //#include "machine/wd17xx.h" #include "machine/keyboard.h" class v6809_state : public driver_device { public: v6809_state(const machine_config &mconfig, device_type type, const char *tag) : driver_device(mconfig, type, tag), m_maincpu(*this, "maincpu"), m_crtc(*this, "crtc"), m_video_address(0) { } required_device m_maincpu; required_device m_crtc; DECLARE_READ8_MEMBER(key_r); DECLARE_READ8_MEMBER(status_r); DECLARE_WRITE8_MEMBER(videoram_w); DECLARE_WRITE8_MEMBER(v6809_address_w); DECLARE_WRITE8_MEMBER(v6809_register_w); DECLARE_WRITE8_MEMBER(kbd_put); UINT8 *m_p_videoram; const UINT8 *m_p_chargen; UINT16 m_video_address; UINT8 m_video_index; UINT8 m_term_data; UINT8 m_vidbyte; virtual void machine_reset(); virtual void video_start(); }; static ADDRESS_MAP_START(v6809_mem, AS_PROGRAM, 8, v6809_state) ADDRESS_MAP_UNMAP_HIGH AM_RANGE(0x0000, 0xefff) AM_RAM AM_RANGE(0xf000, 0xf000) AM_MIRROR(0xfe) AM_DEVREAD("crtc", mc6845_device, status_r) AM_WRITE(v6809_address_w) AM_RANGE(0xf001, 0xf001) AM_MIRROR(0xfe) AM_DEVREAD("crtc", mc6845_device, register_r) AM_WRITE(v6809_register_w) AM_RANGE(0xf200, 0xf200) AM_MIRROR(0xff) AM_WRITE(videoram_w) //AM_RANGE(0xf505, 0xf506) acia-1 (modem) //AM_RANGE(0xf50c, 0xf50d) acia-2 (printer) //AM_RANGE(0xf600, 0xf603) AM_MIRROR(0x3c) disk controller //AM_RANGE(0xf640, 0xf64f) AM_MIRROR(0x30) real time clock //AM_RANGE(0xf680, 0xf683) AM_MIRROR(0x3c) pia-1 (disk & keyboard) //AM_RANGE(0xf6c8, 0xf6cf) timer //AM_RANGE(0xf6d0, 0xf6d3) pia-2 AM_RANGE(0xf800, 0xffff) AM_ROM //temp AM_RANGE(0xf682, 0xf682) AM_READ(key_r) AM_RANGE(0xf683, 0xf683) AM_READ(status_r) ADDRESS_MAP_END static ADDRESS_MAP_START(v6809_io, AS_PROGRAM, 8, v6809_state) AM_RANGE(0x0064, 0x0064) AM_WRITENOP ADDRESS_MAP_END /* Input ports */ static INPUT_PORTS_START( v6809 ) INPUT_PORTS_END // **** Video **** /* F4 Character Displayer */ static const gfx_layout v6809_charlayout = { 8, 10, /* 8 x 10 characters */ 256, /* 128 characters */ 1, /* 1 bits per pixel */ { 0 }, /* no bitplanes */ /* x offsets */ { 0, 1, 2, 3, 4, 5, 6, 7 }, /* y offsets */ { 0*8, 1*8, 2*8, 3*8, 4*8, 5*8, 6*8, 7*8, 8*8, 9*8 }, 8*16 /* every char takes 16 bytes */ }; static GFXDECODE_START( v6809 ) GFXDECODE_ENTRY( "chargen", 0x0000, v6809_charlayout, 0, 1 ) GFXDECODE_END MC6845_UPDATE_ROW( v6809_update_row ) { v6809_state *state = device->machine().driver_data(); const rgb_t *palette = palette_entry_list_raw(bitmap.palette()); UINT8 chr,gfx; UINT16 mem,x; UINT32 *p = &bitmap.pix32(y); for (x = 0; x < x_count; x++) { mem = (ma + x) & 0x7ff; chr = state->m_p_videoram[mem]; if (x == cursor_x) gfx = 0xff; else gfx = state->m_p_chargen[(chr<<4) | ra]; /* Display a scanline of a character (8 pixels) */ *p++ = palette[BIT(gfx, 7)]; *p++ = palette[BIT(gfx, 6)]; *p++ = palette[BIT(gfx, 5)]; *p++ = palette[BIT(gfx, 4)]; *p++ = palette[BIT(gfx, 3)]; *p++ = palette[BIT(gfx, 2)]; *p++ = palette[BIT(gfx, 1)]; *p++ = palette[BIT(gfx, 0)]; } } MC6845_ON_UPDATE_ADDR_CHANGED( v6809_update_addr ) { /* not sure what goes in here - parameters passed are device, address, strobe */ v6809_state *state = device->machine().driver_data(); state->m_video_address = address & 0x7ff; } void v6809_state::video_start() { m_p_chargen = machine().root_device().memregion("chargen")->base(); m_p_videoram = memregion("videoram")->base(); } static const mc6845_interface v6809_crtc = { "screen", /* name of screen */ 8, /* number of dots per character */ NULL, v6809_update_row, /* handler to display a scanline */ NULL, DEVCB_NULL, DEVCB_NULL, DEVCB_NULL, DEVCB_NULL, v6809_update_addr /* handler to process transparent mode */ }; WRITE8_MEMBER( v6809_state::videoram_w ) { m_vidbyte = data; } WRITE8_MEMBER( v6809_state::v6809_address_w ) { m_crtc->address_w( space, 0, data ); m_video_index = data & 0x1f; if (m_video_index == 31) m_p_videoram[m_video_address] = m_vidbyte; } WRITE8_MEMBER( v6809_state::v6809_register_w ) { UINT16 temp = m_video_address; m_crtc->register_w( space, 0, data ); // Get transparent address if (m_video_index == 18) m_video_address = ((data & 7) << 8 ) | (temp & 0xff); else if (m_video_index == 19) m_video_address = data | (temp & 0xff00); } // **** Keyboard **** READ8_MEMBER( v6809_state::key_r ) { UINT8 ret = m_term_data; m_term_data = 0; return ret; } READ8_MEMBER( v6809_state::status_r ) { return (m_term_data) ? 0x80 : 0; } WRITE8_MEMBER( v6809_state::kbd_put ) { m_term_data = data; } static ASCII_KEYBOARD_INTERFACE( keyboard_intf ) { DEVCB_DRIVER_MEMBER(v6809_state, kbd_put) }; // *** Machine **** void v6809_state::machine_reset() { } static MACHINE_CONFIG_START( v6809, v6809_state ) /* basic machine hardware */ MCFG_CPU_ADD("maincpu", M6809, XTAL_16MHz / 4) MCFG_CPU_PROGRAM_MAP(v6809_mem) MCFG_CPU_IO_MAP(v6809_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_SIZE(640, 480) MCFG_SCREEN_VISIBLE_AREA(0, 640-1, 0, 480-1) MCFG_SCREEN_UPDATE_DEVICE("crtc", sy6545_1_device, screen_update) MCFG_PALETTE_LENGTH(2) MCFG_PALETTE_INIT(black_and_white) MCFG_GFXDECODE(v6809) /* Devices */ MCFG_MC6845_ADD("crtc", SY6545_1, XTAL_16MHz / 8, v6809_crtc) MCFG_ASCII_KEYBOARD_ADD(KEYBOARD_TAG, keyboard_intf) MACHINE_CONFIG_END /* ROM definition */ ROM_START( v6809 ) ROM_REGION( 0x10000, "maincpu", 0 ) ROM_LOAD( "v6809.rom", 0xf800, 0x0800, CRC(54bf5f32) SHA1(10d1d70f0b51e2b90e5c29249d3eab4c6b0033a1) ) ROM_REGION( 0x800, "videoram", ROMREGION_ERASE00 ) /* character generator not dumped, using the one from 'h19' for now */ ROM_REGION( 0x1000, "chargen", 0 ) ROM_LOAD( "2716_444-29_h19font.bin", 0x0000, 0x0800, BAD_DUMP CRC(d595ac1d) SHA1(130fb4ea8754106340c318592eec2d8a0deaf3d0)) ROM_RELOAD(0x0800, 0x0800) ROM_END /* Driver */ /* YEAR NAME PARENT COMPAT MACHINE INPUT INIT COMPANY FULLNAME FLAGS */ COMP( 1982, v6809, 0, 0, v6809, v6809, driver_device, 0, "Microkit", "Vegas 6809", GAME_NOT_WORKING | GAME_NO_SOUND)