/*************************************************************************** Southbridge implementation ***************************************************************************/ #include "emu.h" #include "cpu/i386/i386.h" #include "southbridge.h" #include "bus/pc_kbd/keyboards.h" static SLOT_INTERFACE_START(pc_isa_onboard) SLOT_INTERFACE("comat", ISA8_COM_AT) SLOT_INTERFACE("lpt", ISA8_LPT) SLOT_INTERFACE("fdcsmc", ISA8_FDC_SMC) SLOT_INTERFACE_END static MACHINE_CONFIG_FRAGMENT( southbridge ) MCFG_DEVICE_ADD("pit8254", PIT8254, 0) MCFG_PIT8253_CLK0(4772720/4) /* heartbeat IRQ */ MCFG_PIT8253_OUT0_HANDLER(WRITELINE(southbridge_device, at_pit8254_out0_changed)) MCFG_PIT8253_CLK1(4772720/4) /* dram refresh */ MCFG_PIT8253_OUT1_HANDLER(WRITELINE(southbridge_device, at_pit8254_out1_changed)) MCFG_PIT8253_CLK2(4772720/4) /* pio port c pin 4, and speaker polling enough */ MCFG_PIT8253_OUT2_HANDLER(WRITELINE(southbridge_device, at_pit8254_out2_changed)) MCFG_DEVICE_ADD( "dma8237_1", AM9517A, XTAL_14_31818MHz/3 ) MCFG_I8237_OUT_HREQ_CB(DEVWRITELINE("dma8237_2", am9517a_device, dreq0_w)) MCFG_I8237_OUT_EOP_CB(WRITELINE(southbridge_device, at_dma8237_out_eop)) MCFG_I8237_IN_MEMR_CB(READ8(southbridge_device, pc_dma_read_byte)) MCFG_I8237_OUT_MEMW_CB(WRITE8(southbridge_device, pc_dma_write_byte)) MCFG_I8237_IN_IOR_0_CB(READ8(southbridge_device, pc_dma8237_0_dack_r)) MCFG_I8237_IN_IOR_1_CB(READ8(southbridge_device, pc_dma8237_1_dack_r)) MCFG_I8237_IN_IOR_2_CB(READ8(southbridge_device, pc_dma8237_2_dack_r)) MCFG_I8237_IN_IOR_3_CB(READ8(southbridge_device, pc_dma8237_3_dack_r)) MCFG_I8237_OUT_IOW_0_CB(WRITE8(southbridge_device, pc_dma8237_0_dack_w)) MCFG_I8237_OUT_IOW_1_CB(WRITE8(southbridge_device, pc_dma8237_1_dack_w)) MCFG_I8237_OUT_IOW_2_CB(WRITE8(southbridge_device, pc_dma8237_2_dack_w)) MCFG_I8237_OUT_IOW_3_CB(WRITE8(southbridge_device, pc_dma8237_3_dack_w)) MCFG_I8237_OUT_DACK_0_CB(WRITELINE(southbridge_device, pc_dack0_w)) MCFG_I8237_OUT_DACK_1_CB(WRITELINE(southbridge_device, pc_dack1_w)) MCFG_I8237_OUT_DACK_2_CB(WRITELINE(southbridge_device, pc_dack2_w)) MCFG_I8237_OUT_DACK_3_CB(WRITELINE(southbridge_device, pc_dack3_w)) MCFG_DEVICE_ADD( "dma8237_2", AM9517A, XTAL_14_31818MHz/3 ) MCFG_I8237_OUT_HREQ_CB(WRITELINE(southbridge_device, pc_dma_hrq_changed)) MCFG_I8237_IN_MEMR_CB(READ8(southbridge_device, pc_dma_read_word)) MCFG_I8237_OUT_MEMW_CB(WRITE8(southbridge_device, pc_dma_write_word)) MCFG_I8237_IN_IOR_1_CB(READ8(southbridge_device, pc_dma8237_5_dack_r)) MCFG_I8237_IN_IOR_2_CB(READ8(southbridge_device, pc_dma8237_6_dack_r)) MCFG_I8237_IN_IOR_3_CB(READ8(southbridge_device, pc_dma8237_7_dack_r)) MCFG_I8237_OUT_IOW_1_CB(WRITE8(southbridge_device, pc_dma8237_5_dack_w)) MCFG_I8237_OUT_IOW_2_CB(WRITE8(southbridge_device, pc_dma8237_6_dack_w)) MCFG_I8237_OUT_IOW_3_CB(WRITE8(southbridge_device, pc_dma8237_7_dack_w)) MCFG_I8237_OUT_DACK_0_CB(WRITELINE(southbridge_device, pc_dack4_w)) MCFG_I8237_OUT_DACK_1_CB(WRITELINE(southbridge_device, pc_dack5_w)) MCFG_I8237_OUT_DACK_2_CB(WRITELINE(southbridge_device, pc_dack6_w)) MCFG_I8237_OUT_DACK_3_CB(WRITELINE(southbridge_device, pc_dack7_w)) MCFG_PIC8259_ADD( "pic8259_master", INPUTLINE(":maincpu", 0), VCC, READ8(southbridge_device, get_slave_ack) ) MCFG_PIC8259_ADD( "pic8259_slave", DEVWRITELINE("pic8259_master", pic8259_device, ir2_w), GND, NULL ) MCFG_DEVICE_ADD("keybc", AT_KEYBOARD_CONTROLLER, XTAL_12MHz) MCFG_AT_KEYBOARD_CONTROLLER_SYSTEM_RESET_CB(INPUTLINE(":maincpu", INPUT_LINE_RESET)) MCFG_AT_KEYBOARD_CONTROLLER_GATE_A20_CB(INPUTLINE(":maincpu", INPUT_LINE_A20)) MCFG_AT_KEYBOARD_CONTROLLER_INPUT_BUFFER_FULL_CB(DEVWRITELINE("pic8259_master", pic8259_device, ir1_w)) MCFG_AT_KEYBOARD_CONTROLLER_KEYBOARD_CLOCK_CB(DEVWRITELINE("pc_kbdc", pc_kbdc_device, clock_write_from_mb)) MCFG_AT_KEYBOARD_CONTROLLER_KEYBOARD_DATA_CB(DEVWRITELINE("pc_kbdc", pc_kbdc_device, data_write_from_mb)) MCFG_DEVICE_ADD("pc_kbdc", PC_KBDC, 0) MCFG_PC_KBDC_OUT_CLOCK_CB(DEVWRITELINE("keybc", at_keyboard_controller_device, keyboard_clock_w)) MCFG_PC_KBDC_OUT_DATA_CB(DEVWRITELINE("keybc", at_keyboard_controller_device, keyboard_data_w)) MCFG_PC_KBDC_SLOT_ADD("pc_kbdc", "kbd", pc_at_keyboards, STR_KBD_MICROSOFT_NATURAL) MCFG_DS12885_ADD("rtc") MCFG_MC146818_IRQ_HANDLER(DEVWRITELINE("pic8259_slave", pic8259_device, ir0_w)) MCFG_MC146818_CENTURY_INDEX(0x32) MCFG_BUS_MASTER_IDE_CONTROLLER_ADD("ide", ata_devices, "hdd", NULL, false) MCFG_ATA_INTERFACE_IRQ_HANDLER(DEVWRITELINE("pic8259_slave", pic8259_device, ir6_w)) MCFG_BUS_MASTER_IDE_CONTROLLER_SPACE(":maincpu", AS_PROGRAM) MCFG_BUS_MASTER_IDE_CONTROLLER_ADD("ide2", ata_devices, "cdrom", NULL, false) MCFG_ATA_INTERFACE_IRQ_HANDLER(DEVWRITELINE("pic8259_slave", pic8259_device, ir7_w)) MCFG_BUS_MASTER_IDE_CONTROLLER_SPACE(":maincpu", AS_PROGRAM) /* 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("isabus", ISA16, 0) MCFG_ISA16_CPU(":maincpu") MCFG_ISA_OUT_IRQ2_CB(DEVWRITELINE("pic8259_slave", pic8259_device, ir2_w)) // in place of irq 2 on at irq 9 is used MCFG_ISA_OUT_IRQ3_CB(DEVWRITELINE("pic8259_master", pic8259_device, ir3_w)) MCFG_ISA_OUT_IRQ4_CB(DEVWRITELINE("pic8259_master", pic8259_device, ir4_w)) MCFG_ISA_OUT_IRQ5_CB(DEVWRITELINE("pic8259_master", pic8259_device, ir5_w)) MCFG_ISA_OUT_IRQ6_CB(DEVWRITELINE("pic8259_master", pic8259_device, ir6_w)) MCFG_ISA_OUT_IRQ7_CB(DEVWRITELINE("pic8259_master", pic8259_device, ir7_w)) MCFG_ISA_OUT_IRQ10_CB(DEVWRITELINE("pic8259_slave", pic8259_device, ir3_w)) MCFG_ISA_OUT_IRQ11_CB(DEVWRITELINE("pic8259_slave", pic8259_device, ir4_w)) MCFG_ISA_OUT_IRQ12_CB(DEVWRITELINE("pic8259_slave", pic8259_device, ir5_w)) MCFG_ISA_OUT_IRQ14_CB(DEVWRITELINE("pic8259_slave", pic8259_device, ir6_w)) MCFG_ISA_OUT_IRQ15_CB(DEVWRITELINE("pic8259_slave", pic8259_device, ir7_w)) MCFG_ISA_OUT_DRQ0_CB(DEVWRITELINE("dma8237_1", am9517a_device, dreq0_w)) MCFG_ISA_OUT_DRQ1_CB(DEVWRITELINE("dma8237_1", am9517a_device, dreq1_w)) MCFG_ISA_OUT_DRQ2_CB(DEVWRITELINE("dma8237_1", am9517a_device, dreq2_w)) MCFG_ISA_OUT_DRQ3_CB(DEVWRITELINE("dma8237_1", am9517a_device, dreq3_w)) MCFG_ISA_OUT_DRQ5_CB(DEVWRITELINE("dma8237_2", am9517a_device, dreq1_w)) MCFG_ISA_OUT_DRQ6_CB(DEVWRITELINE("dma8237_2", am9517a_device, dreq2_w)) MCFG_ISA_OUT_DRQ7_CB(DEVWRITELINE("dma8237_2", am9517a_device, dreq3_w)) // on board devices MCFG_ISA16_SLOT_ADD("isabus","board1", pc_isa_onboard, "fdcsmc", true) MCFG_ISA16_SLOT_ADD("isabus","board2", pc_isa_onboard, "comat", true) MCFG_ISA16_SLOT_ADD("isabus","board3", pc_isa_onboard, "lpt", true) MACHINE_CONFIG_END //------------------------------------------------- // machine_config_additions - device-specific // machine configurations //------------------------------------------------- machine_config_constructor southbridge_device::device_mconfig_additions() const { return MACHINE_CONFIG_NAME( southbridge ); } southbridge_device::southbridge_device(const machine_config &mconfig, device_type type, const char *name, const char *tag, device_t *owner, UINT32 clock, const char *shortname, const char *source) : device_t(mconfig, type, name, tag, owner, clock, shortname, source), m_maincpu(*this, ":maincpu"), m_pic8259_master(*this, "pic8259_master"), m_pic8259_slave(*this, "pic8259_slave"), m_dma8237_1(*this, "dma8237_1"), m_dma8237_2(*this, "dma8237_2"), m_pit8254(*this, "pit8254"), m_keybc(*this, "keybc"), m_isabus(*this, "isabus"), m_speaker(*this, "speaker"), m_ds12885(*this, "rtc"), m_pc_kbdc(*this, "pc_kbdc"), m_ide(*this, "ide"), m_ide2(*this, "ide2") { } /********************************************************** * * Init functions * **********************************************************/ /// HACK: the memory system cannot cope with mixing the 8 bit device map from the fdc with a 32 bit handler READ8_MEMBER(southbridge_device::ide_read_cs1_r) { return m_ide->read_cs1(space, 1, (UINT32) 0xff0000) >> 16; } WRITE8_MEMBER(southbridge_device::ide_write_cs1_w) { m_ide->write_cs1(space, 1, (UINT32) data << 16, (UINT32) 0xff0000); } READ8_MEMBER(southbridge_device::ide2_read_cs1_r) { return m_ide2->read_cs1(space, 1, (UINT32) 0xff0000) >> 16; } WRITE8_MEMBER(southbridge_device::ide2_write_cs1_w) { m_ide2->write_cs1(space, 1, (UINT32) data << 16, (UINT32) 0xff0000); } //------------------------------------------------- // device_start - device-specific startup //------------------------------------------------- void southbridge_device::device_start() { address_space& spaceio = machine().device(":maincpu")->memory().space(AS_IO); spaceio.install_readwrite_handler(0x0000, 0x001f, read8_delegate(FUNC(am9517a_device::read),&(*m_dma8237_1)), write8_delegate(FUNC(am9517a_device::write),&(*m_dma8237_1)), 0xffffffff); spaceio.install_readwrite_handler(0x0020, 0x003f, read8_delegate(FUNC(pic8259_device::read),&(*m_pic8259_master)), write8_delegate(FUNC(pic8259_device::write),&(*m_pic8259_master)), 0xffffffff); spaceio.install_readwrite_handler(0x0040, 0x005f, read8_delegate(FUNC(pit8254_device::read),&(*m_pit8254)), write8_delegate(FUNC(pit8254_device::write),&(*m_pit8254)), 0xffffffff); spaceio.install_readwrite_handler(0x0060, 0x0063, read8_delegate(FUNC(southbridge_device::at_keybc_r),this), write8_delegate(FUNC(southbridge_device::at_keybc_w),this), 0xffffffff); spaceio.install_readwrite_handler(0x0064, 0x0067, read8_delegate(FUNC(at_keyboard_controller_device::status_r),&(*m_keybc)), write8_delegate(FUNC(at_keyboard_controller_device::command_w),&(*m_keybc)), 0xffffffff); spaceio.install_readwrite_handler(0x0070, 0x007f, read8_delegate(FUNC(ds12885_device::read),&(*m_ds12885)), write8_delegate(FUNC(ds12885_device::write),&(*m_ds12885)), 0xffffffff); spaceio.install_readwrite_handler(0x0080, 0x009f, read8_delegate(FUNC(southbridge_device::at_page8_r),this), write8_delegate(FUNC(southbridge_device::at_page8_w),this), 0xffffffff); spaceio.install_readwrite_handler(0x00a0, 0x00bf, read8_delegate(FUNC(pic8259_device::read),&(*m_pic8259_slave)), write8_delegate(FUNC(pic8259_device::write),&(*m_pic8259_slave)), 0xffffffff); spaceio.install_readwrite_handler(0x00c0, 0x00df, read8_delegate(FUNC(southbridge_device::at_dma8237_2_r),this), write8_delegate(FUNC(southbridge_device::at_dma8237_2_w),this), 0xffffffff); spaceio.install_readwrite_handler(0x0170, 0x0177, read32_delegate(FUNC(bus_master_ide_controller_device::read_cs0),&(*m_ide2)), write32_delegate(FUNC(bus_master_ide_controller_device::write_cs0), &(*m_ide2)),0xffffffff); spaceio.install_readwrite_handler(0x01f0, 0x01f7, read32_delegate(FUNC(bus_master_ide_controller_device::read_cs0),&(*m_ide)), write32_delegate(FUNC(bus_master_ide_controller_device::write_cs0), &(*m_ide)),0xffffffff); // HACK: this works if you take out the (non working) fdc // spaceio.install_readwrite_handler(0x0370, 0x0377, read32_delegate(FUNC(bus_master_ide_controller_device::read_cs1),&(*m_ide2)), write32_delegate(FUNC(bus_master_ide_controller_device::write_cs1), &(*m_ide2)),0xffffffff); // spaceio.install_readwrite_handler(0x03f0, 0x03f7, read32_delegate(FUNC(bus_master_ide_controller_device::read_cs1),&(*m_ide)), write32_delegate(FUNC(bus_master_ide_controller_device::write_cs1), &(*m_ide)),0xffffffff); spaceio.install_readwrite_handler(0x0374, 0x0377, read8_delegate(FUNC(southbridge_device::ide2_read_cs1_r),this), write8_delegate(FUNC(southbridge_device::ide2_write_cs1_w), this),0xff0000); spaceio.install_readwrite_handler(0x03f4, 0x03f7, read8_delegate(FUNC(southbridge_device::ide_read_cs1_r),this), write8_delegate(FUNC(southbridge_device::ide_write_cs1_w), this),0xff0000); spaceio.nop_readwrite(0x00e0, 0x00ef); } //------------------------------------------------- // device_reset - device-specific reset //------------------------------------------------- void southbridge_device::device_reset() { m_at_spkrdata = 0; m_pit_out2 = 0; m_dma_channel = -1; m_cur_eop = false; m_nmi_enabled = 0; m_refresh = false; } /************************************************************* * * pic8259 configuration * *************************************************************/ READ8_MEMBER( southbridge_device::get_slave_ack ) { if (offset==2) // IRQ = 2 return m_pic8259_slave->acknowledge(); return 0x00; } /************************************************************************* * * PC Speaker related * *************************************************************************/ void southbridge_device::at_speaker_set_spkrdata(UINT8 data) { m_at_spkrdata = data ? 1 : 0; m_speaker->level_w(m_at_spkrdata & m_pit_out2); } /************************************************************* * * pit8254 configuration * *************************************************************/ WRITE_LINE_MEMBER( southbridge_device::at_pit8254_out0_changed ) { if (m_pic8259_master) m_pic8259_master->ir0_w(state); } WRITE_LINE_MEMBER( southbridge_device::at_pit8254_out1_changed ) { if(state) m_refresh = !m_refresh; } WRITE_LINE_MEMBER( southbridge_device::at_pit8254_out2_changed ) { m_pit_out2 = state ? 1 : 0; m_speaker->level_w(m_at_spkrdata & m_pit_out2); } /************************************************************************* * * PC DMA stuff * *************************************************************************/ READ8_MEMBER( southbridge_device::at_page8_r ) { UINT8 data = m_at_pages[offset % 0x10]; switch(offset % 8) { case 1: data = m_dma_offset[BIT(offset, 3)][2]; break; case 2: data = m_dma_offset[BIT(offset, 3)][3]; break; case 3: data = m_dma_offset[BIT(offset, 3)][1]; break; case 7: data = m_dma_offset[BIT(offset, 3)][0]; break; } return data; } WRITE8_MEMBER( southbridge_device::at_page8_w ) { m_at_pages[offset % 0x10] = data; switch(offset % 8) { case 1: m_dma_offset[BIT(offset, 3)][2] = data; break; case 2: m_dma_offset[BIT(offset, 3)][3] = data; break; case 3: m_dma_offset[BIT(offset, 3)][1] = data; break; case 7: m_dma_offset[BIT(offset, 3)][0] = data; break; } } WRITE_LINE_MEMBER( southbridge_device::pc_dma_hrq_changed ) { m_maincpu->set_input_line(INPUT_LINE_HALT, state ? ASSERT_LINE : CLEAR_LINE); /* Assert HLDA */ m_dma8237_2->hack_w( state ); } READ8_MEMBER(southbridge_device::pc_dma_read_byte) { address_space& prog_space = m_maincpu->space(AS_PROGRAM); // get the right address space if(m_dma_channel == -1) return 0xff; UINT8 result; offs_t page_offset = (((offs_t) m_dma_offset[0][m_dma_channel]) << 16) & 0xFF0000; result = prog_space.read_byte(page_offset + offset); return result; } WRITE8_MEMBER(southbridge_device::pc_dma_write_byte) { address_space& prog_space = m_maincpu->space(AS_PROGRAM); // get the right address space if(m_dma_channel == -1) return; offs_t page_offset = (((offs_t) m_dma_offset[0][m_dma_channel]) << 16) & 0xFF0000; prog_space.write_byte(page_offset + offset, data); } READ8_MEMBER(southbridge_device::pc_dma_read_word) { address_space& prog_space = m_maincpu->space(AS_PROGRAM); // get the right address space if(m_dma_channel == -1) return 0xff; UINT16 result; offs_t page_offset = (((offs_t) m_dma_offset[1][m_dma_channel & 3]) << 16) & 0xFE0000; result = prog_space.read_word(page_offset + ( offset << 1 ) ); m_dma_high_byte = result & 0xFF00; return result & 0xFF; } WRITE8_MEMBER(southbridge_device::pc_dma_write_word) { address_space& prog_space = m_maincpu->space(AS_PROGRAM); // get the right address space if(m_dma_channel == -1) return; offs_t page_offset = (((offs_t) m_dma_offset[1][m_dma_channel & 3]) << 16) & 0xFE0000; prog_space.write_word(page_offset + ( offset << 1 ), m_dma_high_byte | data); } READ8_MEMBER( southbridge_device::pc_dma8237_0_dack_r ) { return m_isabus->dack_r(0); } READ8_MEMBER( southbridge_device::pc_dma8237_1_dack_r ) { return m_isabus->dack_r(1); } READ8_MEMBER( southbridge_device::pc_dma8237_2_dack_r ) { return m_isabus->dack_r(2); } READ8_MEMBER( southbridge_device::pc_dma8237_3_dack_r ) { return m_isabus->dack_r(3); } READ8_MEMBER( southbridge_device::pc_dma8237_5_dack_r ) { return m_isabus->dack_r(5); } READ8_MEMBER( southbridge_device::pc_dma8237_6_dack_r ) { return m_isabus->dack_r(6); } READ8_MEMBER( southbridge_device::pc_dma8237_7_dack_r ) { return m_isabus->dack_r(7); } WRITE8_MEMBER( southbridge_device::pc_dma8237_0_dack_w ){ m_isabus->dack_w(0, data); } WRITE8_MEMBER( southbridge_device::pc_dma8237_1_dack_w ){ m_isabus->dack_w(1, data); } WRITE8_MEMBER( southbridge_device::pc_dma8237_2_dack_w ){ m_isabus->dack_w(2, data); } WRITE8_MEMBER( southbridge_device::pc_dma8237_3_dack_w ){ m_isabus->dack_w(3, data); } WRITE8_MEMBER( southbridge_device::pc_dma8237_5_dack_w ){ m_isabus->dack_w(5, data); } WRITE8_MEMBER( southbridge_device::pc_dma8237_6_dack_w ){ m_isabus->dack_w(6, data); } WRITE8_MEMBER( southbridge_device::pc_dma8237_7_dack_w ){ m_isabus->dack_w(7, data); } WRITE_LINE_MEMBER( southbridge_device::at_dma8237_out_eop ) { m_cur_eop = state == ASSERT_LINE; if(m_dma_channel != -1) m_isabus->eop_w(m_dma_channel, m_cur_eop ? ASSERT_LINE : CLEAR_LINE ); } void southbridge_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( southbridge_device::pc_dack0_w ) { pc_select_dma_channel(0, state); } WRITE_LINE_MEMBER( southbridge_device::pc_dack1_w ) { pc_select_dma_channel(1, state); } WRITE_LINE_MEMBER( southbridge_device::pc_dack2_w ) { pc_select_dma_channel(2, state); } WRITE_LINE_MEMBER( southbridge_device::pc_dack3_w ) { pc_select_dma_channel(3, state); } WRITE_LINE_MEMBER( southbridge_device::pc_dack4_w ) { m_dma8237_1->hack_w( state ? 0 : 1); } // it's inverted WRITE_LINE_MEMBER( southbridge_device::pc_dack5_w ) { pc_select_dma_channel(5, state); } WRITE_LINE_MEMBER( southbridge_device::pc_dack6_w ) { pc_select_dma_channel(6, state); } WRITE_LINE_MEMBER( southbridge_device::pc_dack7_w ) { pc_select_dma_channel(7, state); } READ8_MEMBER( southbridge_device::at_portb_r ) { UINT8 data = m_at_speaker; data &= ~0xd0; /* AT BIOS don't likes this being set */ /* 0x10 is the dram refresh line bit on the 5170, just a timer here, 15.085us. */ data |= m_refresh ? 0x10 : 0; if (m_pit_out2) data |= 0x20; else data &= ~0x20; /* ps2m30 wants this */ return data; } WRITE8_MEMBER( southbridge_device::at_portb_w ) { m_at_speaker = data; m_pit8254->write_gate2(BIT(data, 0)); at_speaker_set_spkrdata( BIT(data, 1)); m_channel_check = BIT(data, 3); m_isabus->set_nmi_state((m_nmi_enabled==0) && (m_channel_check==0)); } READ8_MEMBER( southbridge_device::at_dma8237_2_r ) { return m_dma8237_2->read( space, offset / 2); } WRITE8_MEMBER( southbridge_device::at_dma8237_2_w ) { m_dma8237_2->write( space, offset / 2, data); } READ8_MEMBER( southbridge_device::at_keybc_r ) { switch (offset) { case 0: return m_keybc->data_r(space, 0); case 1: return at_portb_r(space, 0); } return 0xff; } WRITE8_MEMBER( southbridge_device::at_keybc_w ) { switch (offset) { case 0: m_keybc->data_w(space, 0, data); break; case 1: at_portb_w(space, 0, data); break; } } WRITE8_MEMBER( southbridge_device::write_rtc ) { if (offset==0) { m_nmi_enabled = BIT(data,7); m_isabus->set_nmi_state((m_nmi_enabled==0) && (m_channel_check==0)); m_ds12885->write(space,0,data); } else { m_ds12885->write(space,offset,data); } }