diff options
Diffstat (limited to 'src/mame/drivers/v6809.c')
-rw-r--r-- | src/mame/drivers/v6809.c | 382 |
1 files changed, 382 insertions, 0 deletions
diff --git a/src/mame/drivers/v6809.c b/src/mame/drivers/v6809.c new file mode 100644 index 00000000000..1b408d95335 --- /dev/null +++ b/src/mame/drivers/v6809.c @@ -0,0 +1,382 @@ +// license:BSD-3-Clause +// copyright-holders:Robbbert +/*************************************************************************** + + 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 (Looks like characters 0xc0-0xff produce coloured lores gfx). + + - Connect the RTC interrupt pin (not supported currently) + + - Find the missing character generator rom. + + - Enable sound, when what seems to be a 6840 bug is fixed. + + - Schematic is almost useless, riddled with omissions and errors. + All documents are in French, so no help there. The parts list + only has half of the parts. + + - Need software + + +****************************************************************************/ + +#include "emu.h" +#include "cpu/m6809/m6809.h" +#include "machine/6821pia.h" +#include "machine/6840ptm.h" +#include "machine/clock.h" +#include "video/mc6845.h" +#include "machine/6850acia.h" +#include "machine/mm58274c.h" +#include "machine/keyboard.h" +#include "sound/speaker.h" +#include "machine/wd_fdc.h" + +#define KEYBOARD_TAG "keyboard" + +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_video_address(0), + m_pia0(*this, "pia0"), + m_maincpu(*this, "maincpu"), + m_crtc(*this, "crtc"), + m_fdc(*this, "fdc"), + m_floppy0(*this, "fdc:0"), + m_speaker(*this, "speaker"), + m_acia0(*this, "acia0"), + m_acia1(*this, "acia1"), + m_palette(*this, "palette") + { + } + + DECLARE_WRITE8_MEMBER(speaker_en_w); + DECLARE_WRITE8_MEMBER(speaker_w); + DECLARE_READ8_MEMBER(pb_r); + DECLARE_WRITE8_MEMBER(pa_w); + DECLARE_WRITE8_MEMBER(videoram_w); + DECLARE_WRITE8_MEMBER(v6809_address_w); + DECLARE_WRITE8_MEMBER(v6809_register_w); + DECLARE_WRITE8_MEMBER(kbd_put); + DECLARE_WRITE_LINE_MEMBER(write_acia_clock); + DECLARE_MACHINE_RESET(v6809); + MC6845_UPDATE_ROW(crtc_update_row); + MC6845_ON_UPDATE_ADDR_CHANGED(crtc_update_addr); + + UINT8 *m_p_videoram; + const UINT8 *m_p_chargen; + UINT16 m_video_address; + +private: + bool m_speaker_en; + UINT8 m_video_index; + UINT8 m_term_data; + UINT8 m_vidbyte; + required_device<pia6821_device> m_pia0; + required_device<cpu_device> m_maincpu; + required_device<mc6845_device> m_crtc; + required_device<mb8876_t> m_fdc; + required_device<floppy_connector> m_floppy0; + required_device<speaker_sound_device> m_speaker; + required_device<acia6850_device> m_acia0; + required_device<acia6850_device> m_acia1; +public: + required_device<palette_device> m_palette; +}; + + +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(0xf504, 0xf504) AM_MIRROR(0x36) AM_DEVREADWRITE("acia0", acia6850_device, status_r, control_w) // modem + AM_RANGE(0xf505, 0xf505) AM_MIRROR(0x36) AM_DEVREADWRITE("acia0", acia6850_device, data_r, data_w) + AM_RANGE(0xf50c, 0xf50c) AM_MIRROR(0x36) AM_DEVREADWRITE("acia1", acia6850_device, status_r, control_w) // printer + AM_RANGE(0xf50d, 0xf50d) AM_MIRROR(0x36) AM_DEVREADWRITE("acia1", acia6850_device, data_r, data_w) + AM_RANGE(0xf600, 0xf603) AM_MIRROR(0x3c) AM_DEVREADWRITE("fdc", mb8876_t, read, write) + AM_RANGE(0xf640, 0xf64f) AM_MIRROR(0x30) AM_DEVREADWRITE("rtc", mm58274c_device, read, write) + AM_RANGE(0xf680, 0xf683) AM_MIRROR(0x3c) AM_DEVREADWRITE("pia0", pia6821_device, read, write) + AM_RANGE(0xf6c8, 0xf6cf) AM_MIRROR(0x08) AM_DEVREADWRITE("ptm", ptm6840_device, read, write) + AM_RANGE(0xf6d0, 0xf6d3) AM_MIRROR(0x0c) AM_DEVREADWRITE("pia1", pia6821_device, read, write) + AM_RANGE(0xf800, 0xffff) AM_ROM +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 + +MACHINE_RESET_MEMBER( v6809_state, v6809) +{ + m_p_chargen = memregion("chargen")->base(); + m_p_videoram = memregion("videoram")->base(); + m_term_data = 0; + m_pia0->cb1_w(1); +} + +// **** 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_state::crtc_update_row ) +{ + const rgb_t *palette = m_palette->palette()->entry_list_raw(); + UINT8 chr,gfx; + UINT16 mem,x; + UINT32 *p = &bitmap.pix32(y); + + for (x = 0; x < x_count; x++) + { + mem = (ma + x) & 0x7ff; + chr = m_p_videoram[mem]; + gfx = m_p_chargen[(chr<<4) | ra] ^ ((x == cursor_x) ? 0xff : 0); + + /* 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_state::crtc_update_addr ) +{ +/* not sure what goes in here - parameters passed are device, address, strobe */ + m_video_address = address & 0x7ff; +} + +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 **** + +WRITE8_MEMBER( v6809_state::kbd_put ) +{ + m_term_data = data; + m_pia0->cb1_w(0); + m_pia0->cb1_w(1); +} + +WRITE_LINE_MEMBER( v6809_state::write_acia_clock ) +{ + m_acia0->write_txc(state); + m_acia0->write_rxc(state); + m_acia1->write_txc(state); + m_acia1->write_rxc(state); +} + +READ8_MEMBER( v6809_state::pb_r ) +{ + UINT8 ret = m_term_data; + m_term_data = 0; + return ret; +} + +// can support 4 drives +WRITE8_MEMBER( v6809_state::pa_w ) +{ + floppy_image_device *floppy = NULL; + if ((data & 3) == 0) floppy = m_floppy0->get_device(); + //if ((data & 3) == 1) floppy = m_floppy1->get_device(); + //if ((data & 3) == 2) floppy = m_floppy2->get_device(); + //if ((data & 3) == 3) floppy = m_floppy3->get_device(); + + m_fdc->set_floppy(floppy); + +// Bits 2 and 3 go to the floppy connector but are not documented + + if (floppy) + { + floppy->mon_w(0); + m_fdc->dden_w(BIT(data, 4)); + } +} + +// this should output 1 to enable sound, then output 0 after a short time +// however it continuously outputs 1 +WRITE8_MEMBER( v6809_state::speaker_en_w ) +{ + m_speaker_en = data; +} + +WRITE8_MEMBER( v6809_state::speaker_w ) +{ +// if (m_speaker_en) +// m_speaker->level_w(data); +} + +static SLOT_INTERFACE_START( v6809_floppies ) + SLOT_INTERFACE( "525dd", FLOPPY_525_DD ) +SLOT_INTERFACE_END + + +// *** Machine **** + +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_OVERRIDE(v6809_state, 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_PALETTE_ADD_BLACK_AND_WHITE("palette") + MCFG_GFXDECODE_ADD("gfxdecode", "palette", v6809) + + /* sound hardware */ + MCFG_SPEAKER_STANDARD_MONO("mono") + MCFG_SOUND_ADD("speaker", SPEAKER_SOUND, 0) + MCFG_SOUND_ROUTE(ALL_OUTPUTS, "mono", 0.50) + + /* devices */ + MCFG_MC6845_ADD("crtc", SY6545_1, "screen", XTAL_16MHz / 8) + MCFG_MC6845_SHOW_BORDER_AREA(false) + MCFG_MC6845_CHAR_WIDTH(8) + MCFG_MC6845_UPDATE_ROW_CB(v6809_state, crtc_update_row) + MCFG_MC6845_ADDR_CHANGED_CB(v6809_state, crtc_update_addr) + + MCFG_DEVICE_ADD(KEYBOARD_TAG, GENERIC_KEYBOARD, 0) + MCFG_GENERIC_KEYBOARD_CB(WRITE8(v6809_state, kbd_put)) + +// port A = drive select and 2 control lines ; port B = keyboard +// CB2 connects to the interrupt pin of the RTC (the rtc code doesn't support it) + MCFG_DEVICE_ADD("pia0", PIA6821, 0) + MCFG_PIA_READPB_HANDLER(READ8(v6809_state, pb_r)) + MCFG_PIA_WRITEPA_HANDLER(WRITE8(v6809_state, pa_w)) + MCFG_PIA_IRQA_HANDLER(DEVWRITELINE("maincpu", m6809_device, irq_line)) + MCFG_PIA_IRQB_HANDLER(DEVWRITELINE("maincpu", m6809_device, irq_line)) + +// no idea what this does + MCFG_DEVICE_ADD("pia1", PIA6821, 0) + MCFG_PIA_IRQA_HANDLER(DEVWRITELINE("maincpu", m6809_device, irq_line)) + MCFG_PIA_IRQB_HANDLER(DEVWRITELINE("maincpu", m6809_device, irq_line)) + + MCFG_DEVICE_ADD("ptm", PTM6840, 0) + MCFG_PTM6840_INTERNAL_CLOCK(XTAL_16MHz / 4) + MCFG_PTM6840_EXTERNAL_CLOCKS(4000000/14, 4000000/14, 4000000/14/8) + MCFG_PTM6840_OUT1_CB(WRITE8(v6809_state, speaker_w)) + MCFG_PTM6840_OUT2_CB(WRITE8(v6809_state, speaker_en_w)) + MCFG_PTM6840_IRQ_CB(INPUTLINE("maincpu", M6809_IRQ_LINE)) + + MCFG_DEVICE_ADD("acia0", ACIA6850, 0) + + MCFG_DEVICE_ADD("acia1", ACIA6850, 0) + + MCFG_DEVICE_ADD("acia_clock", CLOCK, 10) + MCFG_CLOCK_SIGNAL_HANDLER(WRITELINE(v6809_state, write_acia_clock)) + + MCFG_DEVICE_ADD("rtc", MM58274C, 0) +// this is all guess + MCFG_MM58274C_MODE24(0) // 12 hour + MCFG_MM58274C_DAY1(1) // monday + + MCFG_MB8876_ADD("fdc", XTAL_16MHz / 16) + MCFG_FLOPPY_DRIVE_ADD("fdc:0", v6809_floppies, "525dd", floppy_image_device::default_floppy_formats) + MCFG_FLOPPY_DRIVE_SOUND(true) +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 CLASS INIT COMPANY FULLNAME FLAGS */ +COMP( 1982, v6809, 0, 0, v6809, v6809, driver_device, 0, "Microkit", "Vegas 6809", MACHINE_NOT_WORKING ) |