diff options
Diffstat (limited to 'src/mess/drivers/v6809.c')
-rw-r--r-- | src/mess/drivers/v6809.c | 290 |
1 files changed, 290 insertions, 0 deletions
diff --git a/src/mess/drivers/v6809.c b/src/mess/drivers/v6809.c new file mode 100644 index 00000000000..3aa1fd9a96e --- /dev/null +++ b/src/mess/drivers/v6809.c @@ -0,0 +1,290 @@ +/*************************************************************************** + + 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<cpu_device> m_maincpu; + required_device<mc6845_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; +}; + + +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<v6809_state>(); + 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<v6809_state>(); + state->m_video_address = address & 0x7ff; +} + +static VIDEO_START( v6809 ) +{ + v6809_state *state = machine.driver_data<v6809_state>(); + state->m_p_chargen = machine.root_device().memregion("chargen")->base(); + state->m_p_videoram = state->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 **** + +static MACHINE_RESET(v6809) +{ +} + +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) + + MCFG_MACHINE_RESET(v6809) + + /* 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_VIDEO_START(v6809) + 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) |