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Diffstat (limited to 'src/mess/drivers/aussiebyte.c')
-rw-r--r-- | src/mess/drivers/aussiebyte.c | 574 |
1 files changed, 574 insertions, 0 deletions
diff --git a/src/mess/drivers/aussiebyte.c b/src/mess/drivers/aussiebyte.c new file mode 100644 index 00000000000..4980be8204d --- /dev/null +++ b/src/mess/drivers/aussiebyte.c @@ -0,0 +1,574 @@ +// license:BSD-3-Clause +// copyright-holders:Robbbert +/************************************************************************************************* + + The Aussie Byte II Single-Board Computer, created by SME Systems, Melbourne, Australia. + Also known as the Knight 2000 Microcomputer. + + Status: + Boots up from floppy. + Output to serial terminal and to 6545 are working. Serial keyboard works. + + Developed in conjunction with members of the MSPP. Written in July, 2015. + + ToDo: + - CRT8002 attributes controller + - Graphics + - Hard drive controllers and drives + - Test Centronics printer + - PIO connections + - RTC not working + + Note of MAME restrictions: + - Votrax doesn't sound anything like the real thing + - WD1001/WD1002 device is not emulated + - CRT8002 device is not emulated + +**************************************************************************************************/ + +/*********************************************************** + + Includes + +************************************************************/ +#include "includes/aussiebyte.h" + + +/*********************************************************** + + Address Maps + +************************************************************/ + +static ADDRESS_MAP_START( aussiebyte_map, AS_PROGRAM, 8, aussiebyte_state ) + AM_RANGE(0x0000, 0x3fff) AM_READ_BANK("bankr0") AM_WRITE_BANK("bankw0") + AM_RANGE(0x4000, 0x7fff) AM_RAMBANK("bank1") + AM_RANGE(0x8000, 0xbfff) AM_RAMBANK("bank2") + AM_RANGE(0xc000, 0xffff) AM_RAM AM_REGION("mram", 0x0000) +ADDRESS_MAP_END + +static ADDRESS_MAP_START( aussiebyte_io, AS_IO, 8, aussiebyte_state ) + ADDRESS_MAP_GLOBAL_MASK(0xff) + ADDRESS_MAP_UNMAP_HIGH + AM_RANGE(0x00, 0x03) AM_DEVREADWRITE("sio1", z80sio0_device, ba_cd_r, ba_cd_w) + AM_RANGE(0x04, 0x07) AM_DEVREADWRITE("pio1", z80pio_device, read, write) + AM_RANGE(0x08, 0x0b) AM_DEVREADWRITE("ctc", z80ctc_device, read, write) + AM_RANGE(0x0c, 0x0f) AM_NOP // winchester interface + AM_RANGE(0x10, 0x13) AM_DEVREADWRITE("fdc", wd2797_t, read, write) + AM_RANGE(0x14, 0x14) AM_DEVREADWRITE("dma", z80dma_device, read, write) + AM_RANGE(0x15, 0x15) AM_WRITE(port15_w) // boot rom disable + AM_RANGE(0x16, 0x16) AM_WRITE(port16_w) // fdd select + AM_RANGE(0x17, 0x17) AM_WRITE(port17_w) // DMA mux + AM_RANGE(0x18, 0x18) AM_WRITE(port18_w) // fdc select + AM_RANGE(0x19, 0x19) AM_READ(port19_r) // info port + AM_RANGE(0x1a, 0x1a) AM_WRITE(port1a_w) // membank + AM_RANGE(0x1b, 0x1b) AM_WRITE(port1b_w) // winchester control + AM_RANGE(0x1c, 0x1f) AM_WRITE(port1c_w) // gpebh select + AM_RANGE(0x20, 0x23) AM_DEVREADWRITE("pio2", z80pio_device, read, write) + AM_RANGE(0x24, 0x27) AM_DEVREADWRITE("sio2", z80sio0_device, ba_cd_r, ba_cd_w) + AM_RANGE(0x28, 0x28) AM_READ(port28_r) AM_DEVWRITE("votrax", votrax_sc01_device, write) + AM_RANGE(0x2c, 0x2c) AM_DEVWRITE("votrax", votrax_sc01_device, inflection_w) + AM_RANGE(0x30, 0x30) AM_WRITE(address_w) + AM_RANGE(0x31, 0x31) AM_DEVREAD("crtc", mc6845_device, status_r) + AM_RANGE(0x32, 0x32) AM_WRITE(register_w) + AM_RANGE(0x33, 0x33) AM_READ(port33_r) + AM_RANGE(0x34, 0x34) AM_WRITE(port34_w) // video control + AM_RANGE(0x35, 0x35) AM_WRITE(port35_w) // data to vram and aram + AM_RANGE(0x36, 0x36) AM_READ(port36_r) // data from vram and aram + AM_RANGE(0x37, 0x37) AM_READ(port37_r) // read dispen flag + AM_RANGE(0x40, 0x4f) AM_DEVREADWRITE("rtc", msm5832_device, data_r, data_w) +ADDRESS_MAP_END + +/*********************************************************** + + Keyboard + +************************************************************/ +static INPUT_PORTS_START( aussiebyte ) +INPUT_PORTS_END + +/*********************************************************** + + I/O Ports + +************************************************************/ +WRITE8_MEMBER( aussiebyte_state::port15_w ) +{ + membank("bankr0")->set_entry(m_port15); // point at ram + m_port15 = true; +} + +/* FDD select +0 Drive Select bit O +1 Drive Select bit 1 +2 Drive Select bit 2 +3 Drive Select bit 3 + - These bits connect to a 74LS145 binary to BCD converter. + - Drives 0 to 3 are 5.25 inch, 4 to 7 are 8 inch, 9 and 0 are not used. + - Currently we only support drive 0. +4 Side Select to Disk Drives. +5 Disable 5.25 inch floppy spindle motors. +6 Unused. +7 Enable write precompensation on WD2797 controller. */ +WRITE8_MEMBER( aussiebyte_state::port16_w ) +{ + floppy_image_device *m_floppy = NULL; + if ((data & 15) == 0) + m_floppy = m_floppy0->get_device(); + else + if ((data & 15) == 1) + m_floppy = m_floppy1->get_device(); + + m_fdc->set_floppy(m_floppy); + + if (m_floppy) + { + m_floppy->mon_w(BIT(data, 5)); + m_floppy->ss_w(BIT(data, 4)); + } +} + +/* DMA select +0 - FDC +1 - SIO Ch A +2 - SIO Ch B +3 - Winchester bus +4 - SIO Ch C +5 - SIO Ch D +6 - Ext ready 1 +7 - Ext ready 2 */ +WRITE8_MEMBER( aussiebyte_state::port17_w ) +{ + m_port17 = data & 7; + m_dma->rdy_w(BIT(m_port17_rdy, data)); +} + +/* FDC params +2 EXC: WD2797 clock frequency. H = 5.25"; L = 8" +3 WIEN: WD2797 Double density select. */ +WRITE8_MEMBER( aussiebyte_state::port18_w ) +{ + m_fdc->set_unscaled_clock(BIT(data, 2) ? 1e6 : 2e6); + m_fdc->dden_w(BIT(data, 3)); +} + +READ8_MEMBER( aussiebyte_state::port19_r ) +{ + return m_port19; +} + +// Memory banking +WRITE8_MEMBER( aussiebyte_state::port1a_w ) +{ + data &= 7; + switch (data) + { + case 0: + case 1: + case 2: + case 3: + case 4: + m_port1a = data*3+1; + if (m_port15) + membank("bankr0")->set_entry(data*3+1); + membank("bankw0")->set_entry(data*3+1); + membank("bank1")->set_entry(data*3+2); + membank("bank2")->set_entry(data*3+3); + break; + case 5: + m_port1a = 1; + if (m_port15) + membank("bankr0")->set_entry(1); + membank("bankw0")->set_entry(1); + membank("bank1")->set_entry(2); + membank("bank2")->set_entry(13); + break; + case 6: + m_port1a = 14; + if (m_port15) + membank("bankr0")->set_entry(14); + membank("bankw0")->set_entry(14); + membank("bank1")->set_entry(15); + //membank("bank2")->set_entry(0); // open bus + break; + case 7: + m_port1a = 1; + if (m_port15) + membank("bankr0")->set_entry(1); + membank("bankw0")->set_entry(1); + membank("bank1")->set_entry(4); + membank("bank2")->set_entry(13); + break; + } +} + +// Winchester control +WRITE8_MEMBER( aussiebyte_state::port1b_w ) +{ +} + +// GPEHB control +WRITE8_MEMBER( aussiebyte_state::port1c_w ) +{ +} + +WRITE8_MEMBER( aussiebyte_state::port20_w ) +{ + m_speaker->level_w(BIT(data, 7)); +} + +READ8_MEMBER( aussiebyte_state::port28_r ) +{ + return m_port28; +} + +/*********************************************************** + + DMA + +************************************************************/ +READ8_MEMBER( aussiebyte_state::memory_read_byte ) +{ + address_space& prog_space = m_maincpu->space(AS_PROGRAM); + return prog_space.read_byte(offset); +} + +WRITE8_MEMBER( aussiebyte_state::memory_write_byte ) +{ + address_space& prog_space = m_maincpu->space(AS_PROGRAM); + prog_space.write_byte(offset, data); +} + +READ8_MEMBER( aussiebyte_state::io_read_byte ) +{ + address_space& prog_space = m_maincpu->space(AS_IO); + return prog_space.read_byte(offset); +} + +WRITE8_MEMBER( aussiebyte_state::io_write_byte ) +{ + address_space& prog_space = m_maincpu->space(AS_IO); + prog_space.write_byte(offset, data); +} + +WRITE_LINE_MEMBER( aussiebyte_state::busreq_w ) +{ +// since our Z80 has no support for BUSACK, we assume it is granted immediately + m_maincpu->set_input_line(Z80_INPUT_LINE_BUSRQ, state); + m_dma->bai_w(state); // tell dma that bus has been granted +} + +/*********************************************************** + + DMA selector + +************************************************************/ +WRITE_LINE_MEMBER( aussiebyte_state::sio1_rdya_w ) +{ + m_port17_rdy = (m_port17_rdy & 0xfd) | (UINT8)(state << 1); + if (m_port17 == 1) + m_dma->rdy_w(state); +} + +WRITE_LINE_MEMBER( aussiebyte_state::sio1_rdyb_w ) +{ + m_port17_rdy = (m_port17_rdy & 0xfb) | (UINT8)(state << 2); + if (m_port17 == 2) + m_dma->rdy_w(state); +} + +WRITE_LINE_MEMBER( aussiebyte_state::sio2_rdya_w ) +{ + m_port17_rdy = (m_port17_rdy & 0xef) | (UINT8)(state << 4); + if (m_port17 == 4) + m_dma->rdy_w(state); +} + +WRITE_LINE_MEMBER( aussiebyte_state::sio2_rdyb_w ) +{ + m_port17_rdy = (m_port17_rdy & 0xdf) | (UINT8)(state << 5); + if (m_port17 == 5) + m_dma->rdy_w(state); +} + + +/*********************************************************** + + Video + +************************************************************/ + +/* F4 Character Displayer */ +static const gfx_layout crt8002_charlayout = +{ + 8, 12, /* 7 x 11 characters */ + 128, /* 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, 10*8, 11*8 }, + 8*16 /* every char takes 16 bytes */ +}; + +static GFXDECODE_START( crt8002 ) + GFXDECODE_ENTRY( "chargen", 0x0000, crt8002_charlayout, 0, 1 ) +GFXDECODE_END + +/*************************************************************** + + Daisy Chain + +****************************************************************/ + +static const z80_daisy_config daisy_chain_intf[] = +{ + { "dma" }, + { "pio2" }, + { "sio1" }, + { "sio2" }, + { "pio1" }, + { "ctc" }, + { NULL } +}; + + +/*********************************************************** + + CTC + +************************************************************/ + +// baud rate generator. All inputs are 1.2288MHz. +TIMER_DEVICE_CALLBACK_MEMBER( aussiebyte_state::ctc_tick ) +{ + m_ctc->trg0(1); + m_ctc->trg0(0); + m_ctc->trg1(1); + m_ctc->trg1(0); + m_ctc->trg2(1); + m_ctc->trg2(0); +} + +WRITE_LINE_MEMBER( aussiebyte_state::ctc_z0_w ) +{ + m_sio1->rxca_w(state); + m_sio1->txca_w(state); +} + +WRITE_LINE_MEMBER( aussiebyte_state::ctc_z1_w ) +{ + m_sio1->rxtxcb_w(state); + m_sio2->rxca_w(state); + m_sio2->txca_w(state); +} + +WRITE_LINE_MEMBER( aussiebyte_state::ctc_z2_w ) +{ + m_sio2->rxtxcb_w(state); + m_ctc->trg3(1); + m_ctc->trg3(0); +} + +/*********************************************************** + + Centronics ack + +************************************************************/ +WRITE_LINE_MEMBER( aussiebyte_state::write_centronics_busy ) +{ + m_centronics_busy = state; +} + +/*********************************************************** + + Speech ack + +************************************************************/ +WRITE_LINE_MEMBER( aussiebyte_state::votrax_w ) +{ + m_port28 = state; +} + + +/*********************************************************** + + Floppy Disk + +************************************************************/ + +WRITE_LINE_MEMBER( aussiebyte_state::fdc_intrq_w ) +{ + UINT8 data = (m_port19 & 0xbf) | (state ? 0x40 : 0); + m_port19 = data; +} + +WRITE_LINE_MEMBER( aussiebyte_state::fdc_drq_w ) +{ + UINT8 data = (m_port19 & 0x7f) | (state ? 0x80 : 0); + m_port19 = data; + state ^= 1; // inverter on pin38 of fdc + m_port17_rdy = (m_port17_rdy & 0xfe) | (UINT8)state; + if (m_port17 == 0) + m_dma->rdy_w(state); +} + +static SLOT_INTERFACE_START( aussiebyte_floppies ) + SLOT_INTERFACE( "drive0", FLOPPY_525_QD ) + SLOT_INTERFACE( "drive1", FLOPPY_525_QD ) +SLOT_INTERFACE_END + +/*********************************************************** + + Machine Driver + +************************************************************/ +MACHINE_RESET_MEMBER( aussiebyte_state, aussiebyte ) +{ + m_port15 = false; + m_port17 = 0; + m_port17_rdy = 0; + m_port1a = 1; + m_alpha_address = 0; + m_graph_address = 0; + m_p_chargen = memregion("chargen")->base(); + m_p_videoram = memregion("vram")->base(); + m_p_attribram = memregion("aram")->base(); + membank("bankr0")->set_entry(16); // point at rom + membank("bankw0")->set_entry(1); // always write to ram + membank("bank1")->set_entry(2); + membank("bank2")->set_entry(3); + m_maincpu->reset(); +} + +static MACHINE_CONFIG_START( aussiebyte, aussiebyte_state ) + /* basic machine hardware */ + MCFG_CPU_ADD("maincpu", Z80, XTAL_16MHz / 4) + MCFG_CPU_PROGRAM_MAP(aussiebyte_map) + MCFG_CPU_IO_MAP(aussiebyte_io) + MCFG_CPU_CONFIG(daisy_chain_intf) + + MCFG_MACHINE_RESET_OVERRIDE(aussiebyte_state, aussiebyte ) + + /* video hardware */ + MCFG_SCREEN_ADD("screen", RASTER) + MCFG_SCREEN_REFRESH_RATE(50) + 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_GFXDECODE_ADD("gfxdecode", "palette", crt8002) + MCFG_PALETTE_ADD_BLACK_AND_WHITE("palette") + + /* sound hardware */ + MCFG_SPEAKER_STANDARD_MONO("mono") + MCFG_SOUND_ADD("speaker", SPEAKER_SOUND, 0) + MCFG_SOUND_ROUTE(ALL_OUTPUTS, "mono", 0.50) + MCFG_DEVICE_ADD("votrax", VOTRAX_SC01, 720000) /* 720kHz? needs verify */ + MCFG_VOTRAX_SC01_REQUEST_CB(WRITELINE(aussiebyte_state, votrax_w)) + MCFG_SOUND_ROUTE(ALL_OUTPUTS, "mono", 1.00) + + /* devices */ + MCFG_CENTRONICS_ADD("centronics", centronics_devices, "printer") + MCFG_CENTRONICS_DATA_INPUT_BUFFER("cent_data_in") + MCFG_CENTRONICS_BUSY_HANDLER(WRITELINE(aussiebyte_state, write_centronics_busy)) + MCFG_DEVICE_ADD("cent_data_in", INPUT_BUFFER, 0) + MCFG_CENTRONICS_OUTPUT_LATCH_ADD("cent_data_out", "centronics") + + MCFG_DEVICE_ADD("ctc", Z80CTC, XTAL_16MHz / 4) + MCFG_Z80CTC_INTR_CB(INPUTLINE("maincpu", INPUT_LINE_IRQ0)) + MCFG_Z80CTC_ZC0_CB(WRITELINE(aussiebyte_state, ctc_z0_w)) // SIO1 Ch A + MCFG_Z80CTC_ZC1_CB(WRITELINE(aussiebyte_state, ctc_z1_w)) // SIO1 Ch B, SIO2 Ch A + MCFG_Z80CTC_ZC2_CB(WRITELINE(aussiebyte_state, ctc_z2_w)) // SIO2 Ch B, CTC Ch 3 + + MCFG_DEVICE_ADD("dma", Z80DMA, XTAL_16MHz / 4) + MCFG_Z80DMA_OUT_INT_CB(INPUTLINE("maincpu", INPUT_LINE_IRQ0)) + MCFG_Z80DMA_OUT_BUSREQ_CB(WRITELINE(aussiebyte_state, busreq_w)) + // BAO, not used + MCFG_Z80DMA_IN_MREQ_CB(READ8(aussiebyte_state, memory_read_byte)) + MCFG_Z80DMA_OUT_MREQ_CB(WRITE8(aussiebyte_state, memory_write_byte)) + MCFG_Z80DMA_IN_IORQ_CB(READ8(aussiebyte_state, io_read_byte)) + MCFG_Z80DMA_OUT_IORQ_CB(WRITE8(aussiebyte_state, io_write_byte)) + + MCFG_DEVICE_ADD("pio1", Z80PIO, XTAL_16MHz / 4) + MCFG_Z80PIO_OUT_INT_CB(INPUTLINE("maincpu", INPUT_LINE_IRQ0)) + MCFG_Z80PIO_OUT_PA_CB(DEVWRITE8("cent_data_out", output_latch_device, write)) + MCFG_Z80PIO_IN_PB_CB(DEVREAD8("cent_data_in", input_buffer_device, read)) + MCFG_Z80PIO_OUT_ARDY_CB(DEVWRITELINE("centronics", centronics_device, write_strobe)) MCFG_DEVCB_INVERT + + MCFG_DEVICE_ADD("pio2", Z80PIO, XTAL_16MHz / 4) + MCFG_Z80PIO_OUT_INT_CB(INPUTLINE("maincpu", INPUT_LINE_IRQ0)) + MCFG_Z80PIO_OUT_PA_CB(WRITE8(aussiebyte_state, port20_w)) + + MCFG_Z80SIO0_ADD("sio1", XTAL_16MHz / 4, 0, 0, 0, 0) + MCFG_Z80DART_OUT_INT_CB(INPUTLINE("maincpu", INPUT_LINE_IRQ0)) + MCFG_Z80DART_OUT_WRDYA_CB(WRITELINE(aussiebyte_state, sio1_rdya_w)) + MCFG_Z80DART_OUT_WRDYB_CB(WRITELINE(aussiebyte_state, sio1_rdyb_w)) + + MCFG_Z80SIO0_ADD("sio2", XTAL_16MHz / 4, 0, 0, 0, 0) + MCFG_Z80DART_OUT_INT_CB(INPUTLINE("maincpu", INPUT_LINE_IRQ0)) + MCFG_Z80DART_OUT_WRDYA_CB(WRITELINE(aussiebyte_state, sio2_rdya_w)) + MCFG_Z80DART_OUT_WRDYB_CB(WRITELINE(aussiebyte_state, sio2_rdyb_w)) + MCFG_Z80DART_OUT_TXDA_CB(DEVWRITELINE("rs232", rs232_port_device, write_txd)) + MCFG_Z80DART_OUT_DTRA_CB(DEVWRITELINE("rs232", rs232_port_device, write_dtr)) + MCFG_Z80DART_OUT_RTSA_CB(DEVWRITELINE("rs232", rs232_port_device, write_rts)) + + MCFG_RS232_PORT_ADD("rs232", default_rs232_devices, "keyboard") + MCFG_RS232_RXD_HANDLER(DEVWRITELINE("sio2", z80sio0_device, rxa_w)) + + MCFG_WD2797_ADD("fdc", XTAL_16MHz / 16) + MCFG_WD_FDC_INTRQ_CALLBACK(WRITELINE(aussiebyte_state, fdc_intrq_w)) + MCFG_WD_FDC_DRQ_CALLBACK(WRITELINE(aussiebyte_state, fdc_drq_w)) + MCFG_FLOPPY_DRIVE_ADD("fdc:0", aussiebyte_floppies, "drive0", floppy_image_device::default_floppy_formats) + MCFG_FLOPPY_DRIVE_SOUND(true) + MCFG_FLOPPY_DRIVE_ADD("fdc:1", aussiebyte_floppies, "drive1", floppy_image_device::default_floppy_formats) + MCFG_FLOPPY_DRIVE_SOUND(true) + + /* 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(aussiebyte_state, crtc_update_row) + MCFG_MC6845_ADDR_CHANGED_CB(aussiebyte_state, crtc_update_addr) + + MCFG_MSM5832_ADD("rtc", XTAL_32_768kHz) + MCFG_TIMER_DRIVER_ADD_PERIODIC("ctc_tick", aussiebyte_state, ctc_tick, attotime::from_hz(XTAL_4_9152MHz / 4)) +MACHINE_CONFIG_END + + +DRIVER_INIT_MEMBER( aussiebyte_state, aussiebyte ) +{ + // Main ram is divided into 16k blocks (0-15). The boot rom is block number 16. + // For convenience, bank 0 is permanently assigned to C000-FFFF + UINT8 *main = memregion("roms")->base(); + UINT8 *ram = memregion("mram")->base(); + + membank("bankr0")->configure_entries(0, 16, &ram[0x0000], 0x4000); + membank("bankw0")->configure_entries(0, 16, &ram[0x0000], 0x4000); + membank("bank1")->configure_entries(0, 16, &ram[0x0000], 0x4000); + membank("bank2")->configure_entries(0, 16, &ram[0x0000], 0x4000); + membank("bankr0")->configure_entry(16, &main[0x0000]); +} + + +/*********************************************************** + + Game driver + +************************************************************/ + + +ROM_START(aussieby) + ROM_REGION(0x4000, "roms", 0) // Size of bank 16 + ROM_LOAD( "knight_boot_0000.u27", 0x0000, 0x1000, CRC(1f200437) SHA1(80d1d208088b325c16a6824e2da605fb2b00c2ce) ) + + ROM_REGION(0x800, "chargen", 0) + ROM_LOAD( "8002.bin", 0x0000, 0x0800, CRC(fdd6eb13) SHA1(a094d416e66bdab916e72238112a6265a75ca690) ) + + ROM_REGION(0x40000, "mram", ROMREGION_ERASE00) // main ram, 256k dynamic + ROM_REGION(0x10000, "vram", ROMREGION_ERASEFF) // video ram, 64k dynamic + ROM_REGION(0x00800, "aram", ROMREGION_ERASEFF) // attribute ram, 2k static +ROM_END + +/* YEAR NAME PARENT COMPAT MACHINE INPUT CLASS INIT COMPANY FULLNAME FLAGS */ +COMP( 1984, aussieby, 0, 0, aussiebyte, aussiebyte, aussiebyte_state, aussiebyte, "SME Systems", "Aussie Byte II" , MACHINE_IMPERFECT_GRAPHICS ) |