// license:BSD-3-Clause // copyright-holders:Sergey Svishchev /*************************************************************************** BBN BitGraph -- monochrome, raster graphics (768x1024), serial terminal. Apparently had at least four hardware revisions, A-D, but which ROM revisions support which hardware is unclear. A Versabus slot, and various hardware and software options are mentioned in the docs. Best guesses follow. Onboard hardware (common to all revisions) is - 32K ROM - 128K RAM (includes frame buffer) - 3 serial ports, each driven by 6850 ACIA - some kind of baud rate generator, possibly COM8016 - sync serial port, driven by 6854 but apparently never supported by ROM - 682x PIA - AY-3-891x PSG - ER2055 EAROM - DEC VT100 keyboard interface Rev A has additional 4th serial port for mouse (not supported by ROM 1.25). Rev A has 40 hz realtime clock, the rest use 1040 hz. Rev A-C use AY-3-8912 (with one external PIO port, to connect the EAROM). Rev D uses AY-3-8913 (no external ports; EAROM is wired to TBD). Rev B-D have onboard 8035 to talk to parallel printer and mouse. Rev B-D have more memory (at least up to 512K). ROM 1.25 doesn't support mouse, setup mode, pixel data upload and autowrap. Missing/incorrect emulation: Bidirectional keyboard interface (to drive LEDs and speaker). 8035. EAROM. 1.25 only -- clksync() is dummied out -- causes watchdog resets. Selectable memory size. Video enable/reverse video switch. ****************************************************************************/ #include "emu.h" #include "bus/centronics/ctronics.h" #include "bus/rs232/rs232.h" #include "cpu/m68000/m68000.h" #include "cpu/mcs48/mcs48.h" #include "machine/6821pia.h" #include "machine/6850acia.h" #include "machine/clock.h" #include "machine/com8116.h" #include "machine/er2055.h" #include "machine/i8243.h" #include "machine/mc6854.h" #include "machine/ram.h" #include "sound/ay8910.h" #include "bitgrpha.lh" #include "bitgrphb.lh" #define M68K_TAG "maincpu" #define PPU_TAG "ppu" #define ACIA0_TAG "acia0" #define ACIA1_TAG "acia1" #define ACIA2_TAG "acia2" #define ACIA3_TAG "acia3" #define RS232_H_TAG "rs232host" #define RS232_K_TAG "rs232kbd" #define RS232_D_TAG "rs232debug" #define RS232_M_TAG "rs232mouse" #define COM8116_A_TAG "com8116_a" #define COM8116_B_TAG "com8116_b" #define ADLC_TAG "adlc" #define PIA_TAG "pia" #define PSG_TAG "psg" #define EAROM_TAG "earom" #define VERBOSE_DBG 1 /* general debug messages */ #define DBG_LOG(N,M,A) \ do { \ if(VERBOSE_DBG>=N) \ { \ if( M ) \ logerror("%11.6f at %s: %-24s",machine().time().as_double(),machine().describe_context(),(char*)M ); \ logerror A; \ } \ } while (0) class bitgraph_state : public driver_device { public: bitgraph_state(const machine_config &mconfig, device_type type, const char *tag) : driver_device(mconfig, type, tag) , m_maincpu(*this, M68K_TAG) , m_ram(*this, RAM_TAG) , m_acia0(*this, ACIA0_TAG) , m_acia1(*this, ACIA1_TAG) , m_acia2(*this, ACIA2_TAG) , m_acia3(*this, ACIA3_TAG) , m_adlc(*this, ADLC_TAG) , m_dbrga(*this, COM8116_A_TAG) , m_dbrgb(*this, COM8116_B_TAG) , m_pia(*this, PIA_TAG) , m_psg(*this, PSG_TAG) , m_earom(*this, EAROM_TAG) , m_centronics(*this, "centronics") , m_screen(*this, "screen") { } DECLARE_READ8_MEMBER( pia_r ); DECLARE_WRITE8_MEMBER( pia_w ); DECLARE_READ8_MEMBER( pia_pa_r ); DECLARE_READ8_MEMBER( pia_pb_r ); DECLARE_WRITE8_MEMBER( pia_pa_w ); DECLARE_WRITE8_MEMBER( pia_pb_w ); DECLARE_READ_LINE_MEMBER( pia_ca1_r ); DECLARE_WRITE_LINE_MEMBER( pia_cb2_w ); DECLARE_WRITE16_MEMBER( baud_write ); DECLARE_WRITE_LINE_MEMBER( com8116_a_fr_w ); DECLARE_WRITE_LINE_MEMBER( com8116_a_ft_w ); DECLARE_WRITE_LINE_MEMBER( com8116_b_fr_w ); DECLARE_WRITE_LINE_MEMBER( com8116_b_ft_w ); DECLARE_READ8_MEMBER( adlc_r ); DECLARE_WRITE8_MEMBER( adlc_w ); DECLARE_WRITE8_MEMBER( earom_write ); DECLARE_WRITE8_MEMBER( misccr_write ); DECLARE_WRITE_LINE_MEMBER( system_clock_write ); UINT32 screen_update(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect); DECLARE_READ8_MEMBER( ppu_read ); DECLARE_WRITE8_MEMBER( ppu_write ); DECLARE_WRITE8_MEMBER( ppu_i8243_w ); private: virtual void machine_start() override; virtual void machine_reset() override; required_device m_maincpu; required_device m_ram; required_device m_acia0; required_device m_acia1; required_device m_acia2; optional_device m_acia3; optional_device m_adlc; required_device m_dbrga; required_device m_dbrgb; required_device m_pia; required_device m_psg; required_device m_earom; optional_device m_centronics; required_device m_screen; UINT8 *m_videoram; UINT8 m_misccr; UINT8 m_pia_a; UINT8 m_pia_b; UINT8 m_ppu[4]; }; static ADDRESS_MAP_START(bitgrapha_mem, AS_PROGRAM, 16, bitgraph_state) ADDRESS_MAP_UNMAP_HIGH AM_RANGE(0x000000, 0x007fff) AM_ROM AM_RANGE(0x010000, 0x010001) AM_DEVREADWRITE8(ACIA0_TAG, acia6850_device, data_r, data_w, 0xff00) // HOST AM_RANGE(0x010002, 0x010003) AM_DEVREADWRITE8(ACIA0_TAG, acia6850_device, status_r, control_w, 0xff00) AM_RANGE(0x010008, 0x010009) AM_DEVREADWRITE8(ACIA1_TAG, acia6850_device, data_r, data_w, 0x00ff) // KEYBOARD AM_RANGE(0x01000a, 0x01000b) AM_DEVREADWRITE8(ACIA1_TAG, acia6850_device, status_r, control_w, 0x00ff) AM_RANGE(0x010010, 0x010011) AM_DEVREADWRITE8(ACIA2_TAG, acia6850_device, data_r, data_w, 0x00ff) // DEBUGGER AM_RANGE(0x010012, 0x010013) AM_DEVREADWRITE8(ACIA2_TAG, acia6850_device, status_r, control_w, 0x00ff) AM_RANGE(0x010018, 0x010019) AM_DEVREADWRITE8(ACIA3_TAG, acia6850_device, data_r, data_w, 0x00ff) // POINTER AM_RANGE(0x01001a, 0x01001b) AM_DEVREADWRITE8(ACIA3_TAG, acia6850_device, status_r, control_w, 0x00ff) AM_RANGE(0x010020, 0x010027) AM_READWRITE8(adlc_r, adlc_w, 0xff00) AM_RANGE(0x010028, 0x01002f) AM_READWRITE8(pia_r, pia_w, 0xff00) // EAROM, PSG AM_RANGE(0x010030, 0x010031) AM_WRITE(baud_write) AM_RANGE(0x3e0000, 0x3fffff) AM_RAM ADDRESS_MAP_END static ADDRESS_MAP_START(bitgraphb_mem, AS_PROGRAM, 16, bitgraph_state) ADDRESS_MAP_UNMAP_HIGH AM_RANGE(0x000000, 0x007fff) AM_ROM AM_RANGE(0x010000, 0x010001) AM_DEVREADWRITE8(ACIA0_TAG, acia6850_device, data_r, data_w, 0xff00) // HOST AM_RANGE(0x010002, 0x010003) AM_DEVREADWRITE8(ACIA0_TAG, acia6850_device, status_r, control_w, 0xff00) AM_RANGE(0x010008, 0x010009) AM_DEVREADWRITE8(ACIA1_TAG, acia6850_device, data_r, data_w, 0x00ff) // KEYBOARD AM_RANGE(0x01000a, 0x01000b) AM_DEVREADWRITE8(ACIA1_TAG, acia6850_device, status_r, control_w, 0x00ff) AM_RANGE(0x010010, 0x010011) AM_DEVREADWRITE8(ACIA2_TAG, acia6850_device, data_r, data_w, 0x00ff) // DEBUGGER AM_RANGE(0x010012, 0x010013) AM_DEVREADWRITE8(ACIA2_TAG, acia6850_device, status_r, control_w, 0x00ff) AM_RANGE(0x01001a, 0x01001b) AM_WRITE8(misccr_write, 0x00ff) AM_RANGE(0x010020, 0x010027) AM_READWRITE8(adlc_r, adlc_w, 0xff00) AM_RANGE(0x010028, 0x01002f) AM_READWRITE8(pia_r, pia_w, 0xff00) // EAROM, PSG AM_RANGE(0x010030, 0x010031) AM_WRITE(baud_write) // AM_RANGE(0x010030, 0x010037) AM_READ8(ppu_read, 0x00ff) // AM_RANGE(0x010038, 0x01003f) AM_WRITE8(ppu_write, 0x00ff) AM_RANGE(0x380000, 0x3fffff) AM_RAM ADDRESS_MAP_END static INPUT_PORTS_START(bitgraph) INPUT_PORTS_END READ8_MEMBER(bitgraph_state::pia_r) { DBG_LOG(3,"PIA", ("R %d\n", offset)); return m_pia->read(space, 3-offset); } WRITE8_MEMBER(bitgraph_state::pia_w) { DBG_LOG(3,"PIA", ("W %d < %02X\n", offset, data)); return m_pia->write(space, 3-offset, data); } READ_LINE_MEMBER(bitgraph_state::pia_ca1_r) { return m_screen->frame_number() & 1; } WRITE_LINE_MEMBER(bitgraph_state::pia_cb2_w) { // XXX shut up verbose log } READ8_MEMBER(bitgraph_state::pia_pa_r) { UINT8 data = BIT(m_pia_b, 3) ? m_earom->data() : m_pia_a; DBG_LOG(2,"PIA", ("A == %02X (%s)\n", data, BIT(m_pia_b, 3) ? "earom" : "pia")); return data; } WRITE8_MEMBER(bitgraph_state::pia_pa_w) { DBG_LOG(2,"PIA", ("A <- %02X\n", data)); m_pia_a = data; } /* B0 O: BC1 to noisemaker. B1 O: BDIR to noisemaker. B2 O: Clock for EAROM. B3 O: CS1 for EAROM. B4 O: Enable HDLC Xmt interrupt. B5 O: Enable HDLC Rcv interrupt. B6 O: Clear Clock interrupt. Must write a 0 [clear interrupt], then a 1. B7 I: EVEN field ?? */ READ8_MEMBER(bitgraph_state::pia_pb_r) { DBG_LOG(2,"PIA", ("B == %02X\n", m_pia_b)); return m_pia_b; } WRITE8_MEMBER(bitgraph_state::pia_pb_w) { DBG_LOG(2,"PIA", ("B <- %02X\n", data)); m_pia_b = data; switch (m_pia_b & 0x03) { case 2: m_psg->data_w(space, 0, m_pia_a); break; case 3: m_psg->address_w(space, 0, m_pia_a); break; } if (BIT(m_pia_b, 3)) { DBG_LOG(2,"EAROM", ("data <- %02X\n", m_pia_a)); m_earom->set_data(m_pia_a); } // CS1, ~CS2, C1, C2, CK m_earom->set_control(BIT(m_pia_b, 3), BIT(m_pia_b, 3), BIT(m_pia_a, 6), BIT(m_pia_a, 7), BIT(m_pia_b, 2)); if (!BIT(m_pia_b, 6)) { m_maincpu->set_input_line(M68K_IRQ_6, CLEAR_LINE); } } WRITE8_MEMBER(bitgraph_state::earom_write) { DBG_LOG(2,"EAROM", ("addr <- %02X (%02X)\n", data & 0x3f, data)); m_earom->set_address(data & 0x3f); } // written once and never changed WRITE8_MEMBER(bitgraph_state::misccr_write) { DBG_LOG(1,"MISCCR", ("<- %02X (DTR %d MAP %d)\n", data, BIT(data, 3), (data & 3))); m_misccr = data; } WRITE_LINE_MEMBER(bitgraph_state::system_clock_write) { if (!BIT(m_pia_b, 6)) { m_maincpu->set_input_line(M68K_IRQ_6, CLEAR_LINE); return; } if (state) { m_maincpu->set_input_line_and_vector(M68K_IRQ_6, ASSERT_LINE, M68K_INT_ACK_AUTOVECTOR); } else { m_maincpu->set_input_line(M68K_IRQ_6, CLEAR_LINE); } } WRITE16_MEMBER(bitgraph_state::baud_write) { DBG_LOG(1,"Baud", ("%04X\n", data)); m_dbrgb->str_w(data & 15); // 2 DBG m_dbrga->stt_w((data >> 4) & 15); // 1 KBD m_dbrgb->stt_w((data >> 8) & 15); // 3 PNT m_dbrga->str_w((data >> 12) & 15); // 0 HOST } WRITE_LINE_MEMBER(bitgraph_state::com8116_a_fr_w) { m_acia0->write_txc(state); m_acia0->write_rxc(state); } WRITE_LINE_MEMBER(bitgraph_state::com8116_a_ft_w) { m_acia1->write_txc(state); m_acia1->write_rxc(state); } WRITE_LINE_MEMBER(bitgraph_state::com8116_b_fr_w) { m_acia2->write_txc(state); m_acia2->write_rxc(state); } WRITE_LINE_MEMBER(bitgraph_state::com8116_b_ft_w) { if (m_acia3) { m_acia3->write_txc(state); m_acia3->write_rxc(state); } } READ8_MEMBER(bitgraph_state::adlc_r) { DBG_LOG(1,"ADLC", ("R %d\n", offset)); return m_adlc ? m_adlc->read(space, 3-offset) : 0xff; } WRITE8_MEMBER(bitgraph_state::adlc_w) { DBG_LOG(1,"ADLC", ("W %d < %02X\n", offset, data)); if (m_adlc) return m_adlc->write(space, 3-offset, data); } UINT32 bitgraph_state::screen_update(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect) { UINT8 gfx=0; int x,y; for (y = 0; y < 768; y++) { UINT16 *p = &bitmap.pix16(y); for (x = 0; x < 1024/8; x+=2) { gfx = m_videoram[ (x+1) | (y<<7)]; *p++ = BIT(gfx, 7); *p++ = BIT(gfx, 6); *p++ = BIT(gfx, 5); *p++ = BIT(gfx, 4); *p++ = BIT(gfx, 3); *p++ = BIT(gfx, 2); *p++ = BIT(gfx, 1); *p++ = BIT(gfx, 0); gfx = m_videoram[ x | (y<<7)]; *p++ = BIT(gfx, 7); *p++ = BIT(gfx, 6); *p++ = BIT(gfx, 5); *p++ = BIT(gfx, 4); *p++ = BIT(gfx, 3); *p++ = BIT(gfx, 2); *p++ = BIT(gfx, 1); *p++ = BIT(gfx, 0); } } return 0; } READ8_MEMBER(bitgraph_state::ppu_read) { UINT8 data = m_ppu[offset]; DBG_LOG(1,"PPU", ("%d == %02X\n", offset, data)); return data; } WRITE8_MEMBER(bitgraph_state::ppu_write) { DBG_LOG(1,"PPU", ("%d <- %02X\n", offset, data)); m_ppu[offset] = data; } #ifdef UNUSED_FUNCTION static ADDRESS_MAP_START(ppu_io, AS_IO, 8, bitgraph_state) // AM_RANGE(0x00, 0x00) AM_READ(ppu_irq) // AM_RANGE(MCS48_PORT_P1, MCS48_PORT_P1) // AM_RANGE(MCS48_PORT_T0, MCS48_PORT_T0) AM_READ(ppu_t0_r) AM_RANGE(MCS48_PORT_PROG, MCS48_PORT_PROG) AM_DEVWRITE("i8243", i8243_device, i8243_prog_w) ADDRESS_MAP_END #endif /* p4 O: Centronics data 3..0 p5 O: Centronics data 7..4 p6 O: Centronics control p7 I: Centronics status */ WRITE8_MEMBER(bitgraph_state::ppu_i8243_w) { DBG_LOG(1,"PPU", ("8243 %d <- %02X\n", offset + 4, data)); switch (offset) { case 0: m_centronics->write_data0(BIT(data, 0)); m_centronics->write_data1(BIT(data, 1)); m_centronics->write_data2(BIT(data, 2)); m_centronics->write_data3(BIT(data, 3)); break; case 1: m_centronics->write_data4(BIT(data, 0)); m_centronics->write_data5(BIT(data, 1)); m_centronics->write_data6(BIT(data, 2)); m_centronics->write_data7(BIT(data, 3)); break; case 2: m_centronics->write_strobe(BIT(data, 0)); // 1: Paper instruction m_centronics->write_init(BIT(data, 2)); break; case 3: m_centronics->write_ack(BIT(data, 0)); m_centronics->write_busy(BIT(data, 1)); m_centronics->write_perror(BIT(data, 2)); m_centronics->write_select(BIT(data, 3)); break; } } void bitgraph_state::machine_start() { m_videoram = (UINT8 *)m_maincpu->space(AS_PROGRAM).get_write_ptr(0x3e0000); } void bitgraph_state::machine_reset() { m_maincpu->reset(); m_misccr = 0; m_pia_a = 0; m_pia_b = 0; memset(m_ppu, 0, sizeof(m_ppu)); } static MACHINE_CONFIG_FRAGMENT( bg_motherboard ) MCFG_SCREEN_ADD("screen", RASTER) MCFG_SCREEN_REFRESH_RATE(40) MCFG_SCREEN_VBLANK_TIME(ATTOSECONDS_IN_USEC(2500)) /* not accurate */ MCFG_SCREEN_SIZE(1024, 768) MCFG_SCREEN_VISIBLE_AREA(0, 1024-1, 0, 768-1) MCFG_SCREEN_UPDATE_DRIVER(bitgraph_state, screen_update) MCFG_SCREEN_PALETTE("palette") MCFG_PALETTE_ADD_MONOCHROME("palette") MCFG_DEVICE_ADD(ACIA0_TAG, ACIA6850, 0) MCFG_ACIA6850_TXD_HANDLER(DEVWRITELINE(RS232_H_TAG, rs232_port_device, write_txd)) MCFG_ACIA6850_RTS_HANDLER(DEVWRITELINE(RS232_H_TAG, rs232_port_device, write_rts)) MCFG_ACIA6850_IRQ_HANDLER(DEVWRITELINE(M68K_TAG, m68000_device, write_irq1)) MCFG_RS232_PORT_ADD(RS232_H_TAG, default_rs232_devices, "null_modem") MCFG_RS232_RXD_HANDLER(DEVWRITELINE(ACIA0_TAG, acia6850_device, write_rxd)) MCFG_RS232_DCD_HANDLER(DEVWRITELINE(ACIA0_TAG, acia6850_device, write_dcd)) MCFG_RS232_CTS_HANDLER(DEVWRITELINE(ACIA0_TAG, acia6850_device, write_cts)) MCFG_DEVICE_ADD(ACIA1_TAG, ACIA6850, 0) MCFG_ACIA6850_TXD_HANDLER(DEVWRITELINE(RS232_K_TAG, rs232_port_device, write_txd)) MCFG_ACIA6850_RTS_HANDLER(DEVWRITELINE(RS232_K_TAG, rs232_port_device, write_rts)) MCFG_ACIA6850_IRQ_HANDLER(DEVWRITELINE(M68K_TAG, m68000_device, write_irq1)) MCFG_RS232_PORT_ADD(RS232_K_TAG, default_rs232_devices, "keyboard") MCFG_RS232_RXD_HANDLER(DEVWRITELINE(ACIA1_TAG, acia6850_device, write_rxd)) MCFG_RS232_DCD_HANDLER(DEVWRITELINE(ACIA1_TAG, acia6850_device, write_dcd)) MCFG_RS232_CTS_HANDLER(DEVWRITELINE(ACIA1_TAG, acia6850_device, write_cts)) MCFG_DEVICE_ADD(ACIA2_TAG, ACIA6850, 0) MCFG_ACIA6850_TXD_HANDLER(DEVWRITELINE(RS232_D_TAG, rs232_port_device, write_txd)) MCFG_ACIA6850_RTS_HANDLER(DEVWRITELINE(RS232_D_TAG, rs232_port_device, write_rts)) MCFG_ACIA6850_IRQ_HANDLER(DEVWRITELINE(M68K_TAG, m68000_device, write_irq1)) MCFG_RS232_PORT_ADD(RS232_D_TAG, default_rs232_devices, nullptr) MCFG_RS232_RXD_HANDLER(DEVWRITELINE(ACIA2_TAG, acia6850_device, write_rxd)) MCFG_RS232_DCD_HANDLER(DEVWRITELINE(ACIA2_TAG, acia6850_device, write_dcd)) MCFG_RS232_CTS_HANDLER(DEVWRITELINE(ACIA2_TAG, acia6850_device, write_cts)) // XXX actual part may be something else MCFG_DEVICE_ADD(COM8116_A_TAG, COM8116, XTAL_5_0688MHz) MCFG_COM8116_FR_HANDLER(WRITELINE(bitgraph_state, com8116_a_fr_w)) MCFG_COM8116_FT_HANDLER(WRITELINE(bitgraph_state, com8116_a_ft_w)) MCFG_DEVICE_ADD(COM8116_B_TAG, COM8116, XTAL_5_0688MHz) MCFG_COM8116_FR_HANDLER(WRITELINE(bitgraph_state, com8116_b_fr_w)) MCFG_COM8116_FT_HANDLER(WRITELINE(bitgraph_state, com8116_b_ft_w)) MCFG_DEVICE_ADD(PIA_TAG, PIA6821, 0) MCFG_PIA_READCA1_HANDLER(READLINE(bitgraph_state, pia_ca1_r)) MCFG_PIA_CB2_HANDLER(WRITELINE(bitgraph_state, pia_cb2_w)) MCFG_PIA_READPA_HANDLER(READ8(bitgraph_state, pia_pa_r)) MCFG_PIA_WRITEPA_HANDLER(WRITE8(bitgraph_state, pia_pa_w)) MCFG_PIA_READPB_HANDLER(READ8(bitgraph_state, pia_pb_r)) MCFG_PIA_WRITEPB_HANDLER(WRITE8(bitgraph_state, pia_pb_w)) MCFG_ER2055_ADD(EAROM_TAG) MCFG_SPEAKER_STANDARD_MONO("mono") MCFG_SOUND_ADD(PSG_TAG, AY8912, XTAL_1_2944MHz) MCFG_AY8910_PORT_A_WRITE_CB(WRITE8(bitgraph_state, earom_write)) MCFG_SOUND_ROUTE(ALL_OUTPUTS, "mono", 1.00) MACHINE_CONFIG_END #ifdef UNUSED_FUNCTION static MACHINE_CONFIG_FRAGMENT( bg_ppu ) MCFG_CPU_ADD(PPU_TAG, I8035, XTAL_6_9MHz) MCFG_CPU_IO_MAP(ppu_io) MCFG_I8243_ADD("i8243", NOOP, WRITE8(bitgraph_state, ppu_i8243_w)) MCFG_CENTRONICS_ADD("centronics", centronics_devices, "printer") MCFG_CENTRONICS_ACK_HANDLER(DEVWRITELINE("cent_status_in", input_buffer_device, write_bit6)) MCFG_CENTRONICS_BUSY_HANDLER(DEVWRITELINE("cent_status_in", input_buffer_device, write_bit7)) MCFG_CENTRONICS_FAULT_HANDLER(DEVWRITELINE("cent_status_in", input_buffer_device, write_bit4)) MCFG_CENTRONICS_PERROR_HANDLER(DEVWRITELINE("cent_status_in", input_buffer_device, write_bit5)) MCFG_DEVICE_ADD("cent_status_in", INPUT_BUFFER, 0) MCFG_CENTRONICS_OUTPUT_LATCH_ADD("cent_data_out", "centronics") MACHINE_CONFIG_END #endif static MACHINE_CONFIG_START( bitgrpha, bitgraph_state ) MCFG_CPU_ADD(M68K_TAG, M68000, XTAL_6_9MHz) MCFG_CPU_PROGRAM_MAP(bitgrapha_mem) MCFG_FRAGMENT_ADD(bg_motherboard) MCFG_DEVICE_ADD("system_clock", CLOCK, 40) MCFG_CLOCK_SIGNAL_HANDLER(WRITELINE(bitgraph_state, system_clock_write)) MCFG_DEVICE_ADD(ACIA3_TAG, ACIA6850, 0) MCFG_ACIA6850_TXD_HANDLER(DEVWRITELINE(RS232_M_TAG, rs232_port_device, write_txd)) MCFG_ACIA6850_RTS_HANDLER(DEVWRITELINE(RS232_M_TAG, rs232_port_device, write_rts)) MCFG_ACIA6850_IRQ_HANDLER(DEVWRITELINE(M68K_TAG, m68000_device, write_irq1)) MCFG_RS232_PORT_ADD(RS232_M_TAG, default_rs232_devices, nullptr) MCFG_RS232_RXD_HANDLER(DEVWRITELINE(ACIA3_TAG, acia6850_device, write_rxd)) MCFG_RS232_DCD_HANDLER(DEVWRITELINE(ACIA3_TAG, acia6850_device, write_dcd)) MCFG_RS232_CTS_HANDLER(DEVWRITELINE(ACIA3_TAG, acia6850_device, write_cts)) MCFG_DEFAULT_LAYOUT(layout_bitgrpha) MCFG_RAM_ADD(RAM_TAG) MCFG_RAM_DEFAULT_SIZE("128K") MACHINE_CONFIG_END static MACHINE_CONFIG_START( bitgrphb, bitgraph_state ) MCFG_CPU_ADD(M68K_TAG, M68000, XTAL_6_9MHz) MCFG_CPU_PROGRAM_MAP(bitgraphb_mem) MCFG_FRAGMENT_ADD(bg_motherboard) // MCFG_FRAGMENT_ADD(bg_ppu) MCFG_DEVICE_ADD("system_clock", CLOCK, 1040) MCFG_CLOCK_SIGNAL_HANDLER(WRITELINE(bitgraph_state, system_clock_write)) MCFG_DEFAULT_LAYOUT(layout_bitgrphb) MCFG_RAM_ADD(RAM_TAG) MCFG_RAM_DEFAULT_SIZE("512K") MACHINE_CONFIG_END /* ROM definition */ ROM_START( bitgrpha ) ROM_REGION16_BE( 0x8000, M68K_TAG, 0 ) ROM_LOAD( "bg125.rom", 0x000000, 0x008000, CRC(b86c974e) SHA1(5367db80a856444c2a55de22b69a13f97a62f602)) ROM_FILL( 0x38e4, 1, 0x4e ) // disable clksync() ROM_FILL( 0x38e5, 1, 0x75 ) ROM_END ROM_START( bitgrphb ) ROM_REGION16_BE( 0x8000, M68K_TAG, 0 ) ROM_DEFAULT_BIOS("2.33A") ROM_SYSTEM_BIOS(0, "2.33A", "rev 2.33 Alpha' ROM") ROMX_LOAD( "bg2.32lo_u10.bin", 0x004001, 0x002000, CRC(6a702a96) SHA1(acdf1ba34038b4ccafb5b8069e70ae57a3b8a7e0), ROM_BIOS(1)|ROM_SKIP(1)) ROMX_LOAD( "bg2.32hi_u12.bin", 0x004000, 0x002000, CRC(a282a2c8) SHA1(ea7e4d4e197201c8944acef54479d5c2b26d409f), ROM_BIOS(1)|ROM_SKIP(1)) ROMX_LOAD( "bg2.32lo_u11.bin", 0x000001, 0x002000, CRC(46912afd) SHA1(c1f771adc1ef62b1fb1b904ed1d2a61009e24f55), ROM_BIOS(1)|ROM_SKIP(1)) ROMX_LOAD( "bg2.32hi_u13.bin", 0x000000, 0x002000, CRC(731df44f) SHA1(8c238b5943b8864e539f92891a0ffa6ddd4fc779), ROM_BIOS(1)|ROM_SKIP(1)) ROM_SYSTEM_BIOS(1, "3.0P", "rev 3.0P ROM") ROMX_LOAD( "bg5173_u10.bin", 0x004001, 0x002000, CRC(40014850) SHA1(ef0b7da58a5183391a3a03947882197f25694518), ROM_BIOS(2)|ROM_SKIP(1)) ROMX_LOAD( "bg5175_u12.bin", 0x004000, 0x002000, CRC(c2c4cc6c) SHA1(dbbce7cb58b4cef1557a834cbb07b3ace298cb8b), ROM_BIOS(2)|ROM_SKIP(1)) ROMX_LOAD( "bg5174_u11.bin", 0x000001, 0x002000, CRC(639768b9) SHA1(68f623bcf3bb75390ba2b17efc067cf25f915ec0), ROM_BIOS(2)|ROM_SKIP(1)) ROMX_LOAD( "bg5176_u13.bin", 0x000000, 0x002000, CRC(984e7e8c) SHA1(dd13cbaff96a8b9936ae8cb07205c6abe8b27b6e), ROM_BIOS(2)|ROM_SKIP(1)) ROM_SYSTEM_BIOS(2, "ramtest", "RAM test") ROMX_LOAD( "ramtest.rom", 0x000000, 0x004000, CRC(fabe3b34) SHA1(4d892a2ed2b7ea12d83843609981be9069611d43), ROM_BIOS(3)) ROM_REGION( 0x800, PPU_TAG, 0 ) ROM_LOAD( "bg_mouse_u9.bin", 0x0000, 0x0800, CRC(fd827ff5) SHA1(6d4a8e9b18c7610c5cfde40464826d144d387601)) ROM_END /* Driver */ /* YEAR NAME PARENT COMPAT MACHINE INPUT CLASS INIT COMPANY FULLNAME FLAGS */ COMP( 1981, bitgrpha, 0, 0, bitgrpha, bitgraph, driver_device, 0, "BBN", "BitGraph rev A", MACHINE_IMPERFECT_KEYBOARD) COMP( 1982, bitgrphb, 0, 0, bitgrphb, bitgraph, driver_device, 0, "BBN", "BitGraph rev B", MACHINE_NOT_WORKING|MACHINE_IMPERFECT_KEYBOARD)