/*************************************************************************** machine/genpc.c ***************************************************************************/ #include "emu.h" #include "includes/genpc.h" #include "machine/i8255.h" #include "machine/pic8259.h" #include "machine/pit8253.h" #include "sound/speaker.h" #include "machine/ram.h" #include "imagedev/cassette.h" #define VERBOSE_PIO 0 /* PIO (keyboard controller) */ #define PIO_LOG(N,M,A) \ do { \ if(VERBOSE_PIO>=N) \ { \ if( M ) \ logerror("%11.6f: %-24s",machine().time().as_double(),(char*)M ); \ logerror A; \ } \ } while (0) /************************************************************************* * * PC DMA stuff * *************************************************************************/ READ8_DEVICE_HANDLER(pc_page_r) { return 0xFF; } WRITE8_DEVICE_HANDLER(pc_page_w) { ibm5160_mb_device *board = downcast(device); switch(offset % 4) { case 1: board->m_dma_offset[2] = data; break; case 2: board->m_dma_offset[3] = data; break; case 3: board->m_dma_offset[0] = board->m_dma_offset[1] = data; break; } } WRITE_LINE_MEMBER( ibm5160_mb_device::pc_dma_hrq_changed ) { m_maincpu->set_input_line(INPUT_LINE_HALT, state ? ASSERT_LINE : CLEAR_LINE); /* Assert HLDA */ m_dma8237->hack_w(state); } READ8_MEMBER( ibm5160_mb_device::pc_dma_read_byte ) { if(m_dma_channel == -1) return 0xff; address_space &spaceio = m_maincpu->space(AS_PROGRAM); offs_t page_offset = (((offs_t) m_dma_offset[m_dma_channel]) << 16) & 0x0F0000; return spaceio.read_byte( page_offset + offset); } WRITE8_MEMBER( ibm5160_mb_device::pc_dma_write_byte ) { if(m_dma_channel == -1) return; address_space &spaceio = m_maincpu->space(AS_PROGRAM); offs_t page_offset = (((offs_t) m_dma_offset[m_dma_channel]) << 16) & 0x0F0000; spaceio.write_byte( page_offset + offset, data); } READ8_MEMBER( ibm5160_mb_device::pc_dma8237_1_dack_r ) { return m_isabus->dack_r(1); } READ8_MEMBER( ibm5160_mb_device::pc_dma8237_2_dack_r ) { return m_isabus->dack_r(2); } READ8_MEMBER( ibm5160_mb_device::pc_dma8237_3_dack_r ) { return m_isabus->dack_r(3); } WRITE8_MEMBER( ibm5160_mb_device::pc_dma8237_1_dack_w ) { m_isabus->dack_w(1,data); } WRITE8_MEMBER( ibm5160_mb_device::pc_dma8237_2_dack_w ) { m_isabus->dack_w(2,data); } WRITE8_MEMBER( ibm5160_mb_device::pc_dma8237_3_dack_w ) { m_isabus->dack_w(3,data); } WRITE8_MEMBER( ibm5160_mb_device::pc_dma8237_0_dack_w ) { m_u73_q2 = 0; m_dma8237->dreq0_w( m_u73_q2 ); } WRITE_LINE_MEMBER( ibm5160_mb_device::pc_dma8237_out_eop ) { m_cur_eop = state == ASSERT_LINE; if(m_dma_channel != -1 && m_cur_eop) m_isabus->eop_w(m_dma_channel, m_cur_eop ? ASSERT_LINE : CLEAR_LINE ); } void ibm5160_mb_device::pc_select_dma_channel(int channel, bool state) { if(!state) { m_dma_channel = channel; if(m_cur_eop) m_isabus->eop_w(channel, ASSERT_LINE ); } else if(m_dma_channel == channel) { m_dma_channel = -1; if(m_cur_eop) m_isabus->eop_w(channel, CLEAR_LINE ); } } WRITE_LINE_MEMBER( ibm5160_mb_device::pc_dack0_w ) { pc_select_dma_channel(0, state); } WRITE_LINE_MEMBER( ibm5160_mb_device::pc_dack1_w ) { pc_select_dma_channel(1, state); } WRITE_LINE_MEMBER( ibm5160_mb_device::pc_dack2_w ) { pc_select_dma_channel(2, state); } WRITE_LINE_MEMBER( ibm5160_mb_device::pc_dack3_w ) { pc_select_dma_channel(3, state); } I8237_INTERFACE( pc_dma8237_config ) { DEVCB_DEVICE_LINE_MEMBER(DEVICE_SELF_OWNER, ibm5160_mb_device, pc_dma_hrq_changed), DEVCB_DEVICE_LINE_MEMBER(DEVICE_SELF_OWNER, ibm5160_mb_device, pc_dma8237_out_eop), DEVCB_DEVICE_MEMBER(DEVICE_SELF_OWNER, ibm5160_mb_device, pc_dma_read_byte), DEVCB_DEVICE_MEMBER(DEVICE_SELF_OWNER, ibm5160_mb_device, pc_dma_write_byte), { DEVCB_NULL, DEVCB_DEVICE_MEMBER(DEVICE_SELF_OWNER, ibm5160_mb_device, pc_dma8237_1_dack_r), DEVCB_DEVICE_MEMBER(DEVICE_SELF_OWNER, ibm5160_mb_device, pc_dma8237_2_dack_r), DEVCB_DEVICE_MEMBER(DEVICE_SELF_OWNER, ibm5160_mb_device, pc_dma8237_3_dack_r) }, { DEVCB_DEVICE_MEMBER(DEVICE_SELF_OWNER, ibm5160_mb_device, pc_dma8237_0_dack_w), DEVCB_DEVICE_MEMBER(DEVICE_SELF_OWNER, ibm5160_mb_device, pc_dma8237_1_dack_w), DEVCB_DEVICE_MEMBER(DEVICE_SELF_OWNER, ibm5160_mb_device, pc_dma8237_2_dack_w), DEVCB_DEVICE_MEMBER(DEVICE_SELF_OWNER, ibm5160_mb_device, pc_dma8237_3_dack_w) }, // DACK's { DEVCB_DEVICE_LINE_MEMBER(DEVICE_SELF_OWNER, ibm5160_mb_device, pc_dack0_w), DEVCB_DEVICE_LINE_MEMBER(DEVICE_SELF_OWNER, ibm5160_mb_device, pc_dack1_w), DEVCB_DEVICE_LINE_MEMBER(DEVICE_SELF_OWNER, ibm5160_mb_device, pc_dack2_w), DEVCB_DEVICE_LINE_MEMBER(DEVICE_SELF_OWNER, ibm5160_mb_device, pc_dack3_w) } }; /************************************************************* * * pic8259 configuration * *************************************************************/ WRITE_LINE_MEMBER(ibm5160_mb_device::pc_cpu_line) { m_maincpu->set_input_line(INPUT_LINE_IRQ0, state); } const struct pic8259_interface pc_pic8259_config = { DEVCB_DEVICE_LINE_MEMBER(DEVICE_SELF_OWNER, ibm5160_mb_device, pc_cpu_line), DEVCB_LINE_VCC, DEVCB_NULL }; WRITE_LINE_MEMBER(ibm5160_mb_device::pc_speaker_set_spkrdata) { m_pc_spkrdata = state ? 1 : 0; speaker_level_w( m_speaker, m_pc_spkrdata & m_pc_input ); } /************************************************************* * * pit8253 configuration * *************************************************************/ WRITE_LINE_MEMBER( ibm5160_mb_device::pc_pit8253_out1_changed ) { /* Trigger DMA channel #0 */ if ( m_out1 == 0 && state == 1 && m_u73_q2 == 0 ) { m_u73_q2 = 1; m_dma8237->dreq0_w( m_u73_q2 ); } m_out1 = state; } WRITE_LINE_MEMBER( ibm5160_mb_device::pc_pit8253_out2_changed ) { m_pc_input = state ? 1 : 0; speaker_level_w( m_speaker, m_pc_spkrdata & m_pc_input ); } const struct pit8253_config pc_pit8253_config = { { { XTAL_14_31818MHz/12, /* heartbeat IRQ */ DEVCB_NULL, DEVCB_DEVICE_LINE_MEMBER("pic8259", pic8259_device, ir0_w) }, { XTAL_14_31818MHz/12, /* dram refresh */ DEVCB_NULL, DEVCB_DEVICE_LINE_MEMBER(DEVICE_SELF_OWNER, ibm5160_mb_device, pc_pit8253_out1_changed) }, { XTAL_14_31818MHz/12, /* pio port c pin 4, and speaker polling enough */ DEVCB_NULL, DEVCB_DEVICE_LINE_MEMBER(DEVICE_SELF_OWNER, ibm5160_mb_device, pc_pit8253_out2_changed) } } }; /********************************************************** * * PPI8255 interface * * * PORT A (input) * * Directly attached to shift register which stores data * received from the keyboard. * * PORT B (output) * 0 - PB0 - TIM2GATESPK - Enable/disable counting on timer 2 of the 8253 * 1 - PB1 - SPKRDATA - Speaker data * 2 - PB2 - - Enable receiving data from the keyboard when keyboard is not locked. * 3 - PB3 - - Dipsswitch set selector * 4 - PB4 - ENBRAMPCK - Enable ram parity check * 5 - PB5 - ENABLEI/OCK - Enable expansion I/O check * 6 - PB6 - - Connected to keyboard clock signal * 0 = ignore keyboard signals * 1 = accept keyboard signals * 7 - PB7 - - Clear/disable shift register and IRQ1 line * 0 = normal operation * 1 = clear and disable shift register and clear IRQ1 flip flop * * PORT C * 0 - PC0 - - Dipswitch 0/4 SW1 * 1 - PC1 - - Dipswitch 1/5 SW1 * 2 - PC2 - - Dipswitch 2/6 SW1 * 3 - PC3 - - Dipswitch 3/7 SW1 * 4 - PC4 - SPK - Speaker/cassette data * 5 - PC5 - I/OCHCK - Expansion I/O check result * 6 - PC6 - T/C2OUT - Output of 8253 timer 2 * 7 - PC7 - PCK - Parity check result * * IBM5150 SW1: * 0 - OFF - One or more floppy drives * ON - Diskless operation * 1 - OFF - 8087 present * ON - No 8087 present * 2+3 - Used to determine on board memory configuration * OFF OFF - 64KB * ON OFF - 48KB * OFF ON - 32KB * ON ON - 16KB * 4+5 - Used to select display * OFF OFF - Monochrome * ON OFF - CGA, 80 column * OFF ON - CGA, 40 column * ON ON - EGA/VGA display * 6+7 - Used to select number of disk drives * OFF OFF - four disk drives * ON OFF - three disk drives * OFF ON - two disk drives * ON ON - one disk drive * **********************************************************/ WRITE_LINE_MEMBER( ibm5160_mb_device::keyboard_clock_w ) { if ( m_ppi_clock_signal != state ) { if ( m_ppi_keyb_clock && m_ppi_shift_enable ) { m_ppi_clock_signal = state; if ( ! m_ppi_keyboard_clear ) { /* Data is clocked in on a high->low transition */ if ( ! state ) { UINT8 trigger_irq = m_ppi_shift_register & 0x01; m_ppi_shift_register = ( m_ppi_shift_register >> 1 ) | ( m_ppi_data_signal << 7 ); if ( trigger_irq ) { pic8259_ir1_w(m_pic8259, 1); m_ppi_shift_enable = 0; m_ppi_clock_signal = 0; m_pc_kbdc->clock_write_from_mb(m_ppi_clock_signal); } } } } } } WRITE_LINE_MEMBER( ibm5160_mb_device::keyboard_data_w ) { m_ppi_data_signal = state; } READ8_MEMBER (ibm5160_mb_device::pc_ppi_porta_r) { int data = 0xFF; /* KB port A */ if (m_ppi_keyboard_clear) { /* 0 0 - no floppy drives * 1 Not used * 2-3 The number of memory banks on the system board * 4-5 Display mode * 11 = monochrome * 10 - color 80x25 * 01 - color 40x25 * 6-7 The number of floppy disk drives */ data = ioport("DSW0")->read(); } else { data = m_ppi_shift_register; } PIO_LOG(1,"PIO_A_r",("$%02x\n", data)); return data; } READ8_MEMBER ( ibm5160_mb_device::pc_ppi_portc_r ) { int timer2_output = pit8253_get_output( m_pit8253, 2 ); int data=0xff; data&=~0x80; // no parity error data&=~0x40; // no error on expansion board /* KB port C: equipment flags */ if (m_ppi_portc_switch_high) { /* read hi nibble of S2 */ data = (data & 0xf0) | ((ioport("DSW0")->read() >> 4) & 0x0f); PIO_LOG(1,"PIO_C_r (hi)",("$%02x\n", data)); } else { /* read lo nibble of S2 */ data = (data & 0xf0) | (ioport("DSW0")->read() & 0x0f); PIO_LOG(1,"PIO_C_r (lo)",("$%02x\n", data)); } if ( m_ppi_portb & 0x01 ) { data = ( data & ~0x10 ) | ( timer2_output ? 0x10 : 0x00 ); } data = ( data & ~0x20 ) | ( timer2_output ? 0x20 : 0x00 ); return data; } WRITE8_MEMBER( ibm5160_mb_device::pc_ppi_portb_w ) { /* PPI controller port B*/ m_ppi_portb = data; m_ppi_portc_switch_high = data & 0x08; m_ppi_keyboard_clear = data & 0x80; m_ppi_keyb_clock = data & 0x40; pit8253_gate2_w(m_pit8253, BIT(data, 0)); pc_speaker_set_spkrdata( data & 0x02 ); m_ppi_clock_signal = ( m_ppi_keyb_clock ) ? 1 : 0; m_pc_kbdc->clock_write_from_mb(m_ppi_clock_signal); /* If PB7 is set clear the shift register and reset the IRQ line */ if ( m_ppi_keyboard_clear ) { m_pic8259->ir1_w(0); m_ppi_shift_register = 0; m_ppi_shift_enable = 1; } } I8255A_INTERFACE( pc_ppi8255_interface ) { DEVCB_DEVICE_MEMBER(DEVICE_SELF_OWNER, ibm5160_mb_device, pc_ppi_porta_r), DEVCB_NULL, DEVCB_NULL, DEVCB_DEVICE_MEMBER(DEVICE_SELF_OWNER, ibm5160_mb_device, pc_ppi_portb_w), DEVCB_DEVICE_MEMBER(DEVICE_SELF_OWNER, ibm5160_mb_device, pc_ppi_portc_r), DEVCB_NULL }; static const isa8bus_interface isabus_intf = { // interrupts DEVCB_DEVICE_LINE_MEMBER("pic8259", pic8259_device, ir2_w), DEVCB_DEVICE_LINE_MEMBER("pic8259", pic8259_device, ir3_w), DEVCB_DEVICE_LINE_MEMBER("pic8259", pic8259_device, ir4_w), DEVCB_DEVICE_LINE_MEMBER("pic8259", pic8259_device, ir5_w), DEVCB_DEVICE_LINE_MEMBER("pic8259", pic8259_device, ir6_w), DEVCB_DEVICE_LINE_MEMBER("pic8259", pic8259_device, ir7_w), // dma request DEVCB_DEVICE_LINE_MEMBER("dma8237", am9517a_device, dreq1_w), DEVCB_DEVICE_LINE_MEMBER("dma8237", am9517a_device, dreq2_w), DEVCB_DEVICE_LINE_MEMBER("dma8237", am9517a_device, dreq3_w) }; static const pc_kbdc_interface pc_kbdc_intf = { DEVCB_DEVICE_LINE_MEMBER(DEVICE_SELF_OWNER, ibm5160_mb_device, keyboard_clock_w), DEVCB_DEVICE_LINE_MEMBER(DEVICE_SELF_OWNER, ibm5160_mb_device, keyboard_data_w) }; /********************************************************** * * NMI handling * **********************************************************/ static WRITE8_DEVICE_HANDLER( nmi_enable_w ) { ibm5160_mb_device *board = downcast(device); board->m_nmi_enabled = BIT(data,7); board->m_isabus->set_nmi_state(board->m_nmi_enabled); } //************************************************************************** // GLOBAL VARIABLES //************************************************************************** const device_type IBM5160_MOTHERBOARD = &device_creator; //************************************************************************** // DEVICE CONFIGURATION //************************************************************************** static MACHINE_CONFIG_FRAGMENT( ibm5160_mb_config ) MCFG_PIT8253_ADD( "pit8253", pc_pit8253_config ) MCFG_I8237_ADD( "dma8237", XTAL_14_31818MHz/3, pc_dma8237_config ) MCFG_PIC8259_ADD( "pic8259", pc_pic8259_config ) MCFG_I8255A_ADD( "ppi8255", pc_ppi8255_interface ) MCFG_ISA8_BUS_ADD("isa", ":maincpu", isabus_intf) MCFG_PC_KBDC_ADD("pc_kbdc", pc_kbdc_intf) /* sound hardware */ MCFG_SPEAKER_STANDARD_MONO("mono") MCFG_SOUND_ADD(SPEAKER_TAG, SPEAKER_SOUND, 0) MCFG_SOUND_ROUTE(ALL_OUTPUTS, "mono", 1.00) MACHINE_CONFIG_END //------------------------------------------------- // machine_config_additions - device-specific // machine configurations //------------------------------------------------- machine_config_constructor ibm5160_mb_device::device_mconfig_additions() const { return MACHINE_CONFIG_NAME( ibm5160_mb_config ); } static INPUT_PORTS_START( ibm5160_mb ) PORT_START("DSW0") /* IN1 */ PORT_DIPNAME( 0xc0, 0x40, "Number of floppy drives") PORT_DIPSETTING( 0x00, "1" ) PORT_DIPSETTING( 0x40, "2" ) PORT_DIPSETTING( 0x80, "3" ) PORT_DIPSETTING( 0xc0, "4" ) PORT_DIPNAME( 0x30, 0x30, "Graphics adapter") PORT_DIPSETTING( 0x00, "EGA/VGA" ) PORT_DIPSETTING( 0x10, "Color 40x25" ) PORT_DIPSETTING( 0x20, "Color 80x25" ) PORT_DIPSETTING( 0x30, "Monochrome" ) PORT_DIPNAME( 0x0c, 0x0c, "RAM banks") PORT_DIPSETTING( 0x00, "1 - 16/ 64/256K" ) PORT_DIPSETTING( 0x04, "2 - 32/128/512K" ) PORT_DIPSETTING( 0x08, "3 - 48/192/576K" ) PORT_DIPSETTING( 0x0c, "4 - 64/256/640K" ) PORT_DIPNAME( 0x02, 0x00, "8087 installed") PORT_DIPSETTING( 0x00, DEF_STR(No) ) PORT_DIPSETTING( 0x02, DEF_STR(Yes) ) PORT_DIPNAME( 0x01, 0x01, "Boot from floppy") PORT_DIPSETTING( 0x01, DEF_STR(Yes) ) PORT_DIPSETTING( 0x00, DEF_STR(No) ) INPUT_PORTS_END //------------------------------------------------- // input_ports - device-specific input ports //------------------------------------------------- ioport_constructor ibm5160_mb_device::device_input_ports() const { return INPUT_PORTS_NAME( ibm5160_mb ); } void ibm5160_mb_device::static_set_cputag(device_t &device, const char *tag) { ibm5160_mb_device &board = downcast(device); board.m_cputag = tag; } //************************************************************************** // LIVE DEVICE //************************************************************************** //------------------------------------------------- // ibm5160_mb_device - constructor //------------------------------------------------- ibm5160_mb_device::ibm5160_mb_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock) : device_t(mconfig, IBM5160_MOTHERBOARD, "IBM5160_MOTHERBOARD", tag, owner, clock), m_maincpu(*owner, "maincpu"), m_pic8259(*this, "pic8259"), m_dma8237(*this, "dma8237"), m_pit8253(*this, "pit8253"), m_ppi8255(*this, "ppi8255"), m_speaker(*this, SPEAKER_TAG), m_isabus(*this, "isa"), m_pc_kbdc(*this, "pc_kbdc") { } void ibm5160_mb_device::install_device(device_t *dev, offs_t start, offs_t end, offs_t mask, offs_t mirror, read8_device_func rhandler, const char* rhandler_name, write8_device_func whandler, const char *whandler_name) { int buswidth = machine().firstcpu->space_config(AS_IO)->m_databus_width; switch(buswidth) { case 8: m_maincpu->space(AS_IO).install_legacy_readwrite_handler(*dev, start, end, mask, mirror, rhandler, rhandler_name, whandler, whandler_name, 0); break; case 16: m_maincpu->space(AS_IO).install_legacy_readwrite_handler(*dev, start, end, mask, mirror, rhandler, rhandler_name, whandler, whandler_name,0xffff); break; default: fatalerror("IBM5160_MOTHERBOARD: Bus width %d not supported\n", buswidth); break; } } void ibm5160_mb_device::install_device_write(device_t *dev, offs_t start, offs_t end, offs_t mask, offs_t mirror, write8_device_func whandler, const char *whandler_name) { int buswidth = machine().firstcpu->space_config(AS_IO)->m_databus_width; switch(buswidth) { case 8: m_maincpu->space(AS_IO).install_legacy_write_handler(*dev, start, end, mask, mirror, whandler, whandler_name,0); break; case 16: m_maincpu->space(AS_IO).install_legacy_write_handler(*dev, start, end, mask, mirror, whandler, whandler_name, 0xffff); break; default: fatalerror("IBM5160_MOTHERBOARD: Bus width %d not supported\n", buswidth); break; } } void ibm5160_mb_device::install_device(offs_t start, offs_t end, offs_t mask, offs_t mirror, read8_delegate rhandler, write8_delegate whandler) { int buswidth = m_maincpu->space_config(AS_IO)->m_databus_width; switch(buswidth) { case 8: m_maincpu->space(AS_IO).install_readwrite_handler(start, end, mask, mirror, rhandler, whandler, 0); break; case 16: m_maincpu->space(AS_IO).install_readwrite_handler(start, end, mask, mirror, rhandler, whandler, 0xffff); break; default: fatalerror("IBM5160_MOTHERBOARD: Bus width %d not supported\n", buswidth); break; } } //------------------------------------------------- // device_start - device-specific startup //------------------------------------------------- void ibm5160_mb_device::device_start() { install_device(0x0000, 0x000f, 0, 0, read8_delegate(FUNC(am9517a_device::read), (am9517a_device*)m_dma8237), write8_delegate(FUNC(am9517a_device::write), (am9517a_device*)m_dma8237) ); install_device(m_pic8259, 0x0020, 0x0021, 0, 0, FUNC(pic8259_r), FUNC(pic8259_w) ); install_device(m_pit8253, 0x0040, 0x0043, 0, 0, FUNC(pit8253_r), FUNC(pit8253_w) ); // install_device(m_ppi8255, 0x0060, 0x0063, 0, 0, FUNC(i8255a_r), FUNC(i8255a_w) ); int buswidth = machine().firstcpu->space_config(AS_IO)->m_databus_width; switch(buswidth) { case 8: m_maincpu->space(AS_IO).install_readwrite_handler(0x0060, 0x0063, 0, 0, read8_delegate(FUNC(i8255_device::read), (i8255_device*)m_ppi8255), write8_delegate(FUNC(i8255_device::write), (i8255_device*)m_ppi8255), 0); break; case 16: m_maincpu->space(AS_IO).install_readwrite_handler(0x0060, 0x0063, 0, 0, read8_delegate(FUNC(i8255_device::read), (i8255_device*)m_ppi8255), write8_delegate(FUNC(i8255_device::write), (i8255_device*)m_ppi8255), 0xffff); break; default: fatalerror("IBM5160_MOTHERBOARD: Bus width %d not supported\n", buswidth); break; } install_device(this, 0x0080, 0x0087, 0, 0, FUNC(pc_page_r), FUNC(pc_page_w) ); install_device_write(this, 0x00a0, 0x00a1, 0, 0, FUNC(nmi_enable_w)); /* MESS managed RAM */ if ( machine().device(RAM_TAG)->pointer() ) membank( "bank10" )->set_base( machine().device(RAM_TAG)->pointer() ); } IRQ_CALLBACK_MEMBER(ibm5160_mb_device::pc_irq_callback) { return m_pic8259->inta_r(); } //------------------------------------------------- // device_reset - device-specific reset //------------------------------------------------- void ibm5160_mb_device::device_reset() { m_maincpu->set_irq_acknowledge_callback(device_irq_acknowledge_delegate(FUNC(ibm5160_mb_device::pc_irq_callback),this)); m_u73_q2 = 0; m_out1 = 2; // initial state of pit output is undefined m_pc_spkrdata = 0; m_pc_input = 0; m_dma_channel = -1; m_cur_eop = false; memset(m_dma_offset,0,sizeof(m_dma_offset)); m_ppi_portc_switch_high = 0; m_ppi_speaker = 0; m_ppi_keyboard_clear = 0; m_ppi_keyb_clock = 0; m_ppi_portb = 0; m_ppi_clock_signal = 0; m_ppi_data_signal = 0; m_ppi_shift_register = 0; m_ppi_shift_enable = 0; m_nmi_enabled = 0; speaker_level_w( m_speaker, 0 ); } //************************************************************************** // GLOBAL VARIABLES //************************************************************************** const device_type IBM5150_MOTHERBOARD = &device_creator; //************************************************************************** // DEVICE CONFIGURATION //************************************************************************** static const cassette_interface ibm5150_cassette_interface = { cassette_default_formats, NULL, (cassette_state)(CASSETTE_PLAY | CASSETTE_MOTOR_DISABLED | CASSETTE_SPEAKER_ENABLED), NULL, NULL }; static MACHINE_CONFIG_FRAGMENT( ibm5150_mb_config ) MCFG_FRAGMENT_ADD(ibm5160_mb_config) MCFG_CASSETTE_ADD( CASSETTE_TAG, ibm5150_cassette_interface ) MACHINE_CONFIG_END //------------------------------------------------- // machine_config_additions - device-specific // machine configurations //------------------------------------------------- machine_config_constructor ibm5150_mb_device::device_mconfig_additions() const { return MACHINE_CONFIG_NAME( ibm5150_mb_config ); } //************************************************************************** // LIVE DEVICE //************************************************************************** //------------------------------------------------- // ibm5150_mb_device - constructor //------------------------------------------------- ibm5150_mb_device::ibm5150_mb_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock) : ibm5160_mb_device(mconfig, tag, owner, clock), m_cassette(*this, CASSETTE_TAG) { } void ibm5150_mb_device::device_start() { ibm5160_mb_device::device_start(); } void ibm5150_mb_device::device_reset() { ibm5160_mb_device::device_reset(); } READ8_MEMBER (ibm5150_mb_device::pc_ppi_porta_r) { int data = 0xFF; /* KB port A */ if (m_ppi_keyboard_clear) { /* 0 0 - no floppy drives * 1 Not used * 2-3 The number of memory banks on the system board * 4-5 Display mode * 11 = monochrome * 10 - color 80x25 * 01 - color 40x25 * 6-7 The number of floppy disk drives */ data = ioport("DSW0")->read() & 0xF3; switch ( machine().device(RAM_TAG)->size() ) { case 16 * 1024: data |= 0x00; break; case 32 * 1024: /* Need to verify if this is correct */ data |= 0x04; break; case 48 * 1024: /* Need to verify if this is correct */ data |= 0x08; break; default: data |= 0x0C; break; } } else { data = m_ppi_shift_register; } PIO_LOG(1,"PIO_A_r",("$%02x\n", data)); return data; } READ8_MEMBER ( ibm5150_mb_device::pc_ppi_portc_r ) { int timer2_output = pit8253_get_output( m_pit8253, 2 ); int data=0xff; data&=~0x80; // no parity error data&=~0x40; // no error on expansion board /* KB port C: equipment flags */ if (m_ppi_portc_switch_high) { /* read hi nibble of SW2 */ data = data & 0xf0; switch ( machine().device(RAM_TAG)->size() - 64 * 1024 ) { case 64 * 1024: data |= 0x00; break; case 128 * 1024: data |= 0x02; break; case 192 * 1024: data |= 0x04; break; case 256 * 1024: data |= 0x06; break; case 320 * 1024: data |= 0x08; break; case 384 * 1024: data |= 0x0A; break; case 448 * 1024: data |= 0x0C; break; case 512 * 1024: data |= 0x0E; break; case 576 * 1024: data |= 0x01; break; case 640 * 1024: data |= 0x03; break; case 704 * 1024: data |= 0x05; break; case 768 * 1024: data |= 0x07; break; case 832 * 1024: data |= 0x09; break; case 896 * 1024: data |= 0x0B; break; case 960 * 1024: data |= 0x0D; break; } if ( machine().device(RAM_TAG)->size() > 960 * 1024 ) data |= 0x0D; PIO_LOG(1,"PIO_C_r (hi)",("$%02x\n", data)); } else { /* read lo nibble of S2 */ data = (data & 0xf0) | (ioport("DSW0")->read() & 0x0f); PIO_LOG(1,"PIO_C_r (lo)",("$%02x\n", data)); } if ( ! ( m_ppi_portb & 0x08 ) ) { double tap_val = m_cassette->input(); if ( tap_val < 0 ) { data &= ~0x10; } else { data |= 0x10; } } else { if ( m_ppi_portb & 0x01 ) { data = ( data & ~0x10 ) | ( timer2_output ? 0x10 : 0x00 ); } } data = ( data & ~0x20 ) | ( timer2_output ? 0x20 : 0x00 ); return data; } WRITE8_MEMBER( ibm5150_mb_device::pc_ppi_portb_w ) { /* KB controller port B */ m_ppi_portb = data; m_ppi_portc_switch_high = data & 0x08; m_ppi_keyboard_clear = data & 0x80; m_ppi_keyb_clock = data & 0x40; pit8253_gate2_w(m_pit8253, BIT(data, 0)); pc_speaker_set_spkrdata( data & 0x02 ); m_cassette->change_state(( data & 0x08 ) ? CASSETTE_MOTOR_DISABLED : CASSETTE_MOTOR_ENABLED,CASSETTE_MASK_MOTOR); m_ppi_clock_signal = ( m_ppi_keyb_clock ) ? 1 : 0; m_pc_kbdc->clock_write_from_mb(m_ppi_clock_signal); /* If PB7 is set clear the shift register and reset the IRQ line */ if ( m_ppi_keyboard_clear ) { m_pic8259->ir1_w(0); m_ppi_shift_register = 0; m_ppi_shift_enable = 1; } }