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-rw-r--r--src/devices/machine/genpc.cpp921
1 files changed, 921 insertions, 0 deletions
diff --git a/src/devices/machine/genpc.cpp b/src/devices/machine/genpc.cpp
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--- /dev/null
+++ b/src/devices/machine/genpc.cpp
@@ -0,0 +1,921 @@
+// license:BSD-3-Clause
+// copyright-holders:Wilbert Pol, Miodrag Milanovic
+/***************************************************************************
+
+ machine/genpc.c
+
+
+***************************************************************************/
+
+#include "emu.h"
+#include "machine/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
+ *
+ *************************************************************************/
+
+WRITE8_MEMBER( ibm5160_mb_device::pc_page_w)
+{
+ switch(offset % 4)
+ {
+ case 1:
+ m_dma_offset[2] = data;
+ break;
+ case 2:
+ m_dma_offset[3] = data;
+ break;
+ case 3:
+ m_dma_offset[0] = 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); }
+
+/*************************************************************
+ *
+ * pic8259 configuration
+ *
+ *************************************************************/
+
+WRITE_LINE_MEMBER(ibm5160_mb_device::pc_speaker_set_spkrdata)
+{
+ m_pc_spkrdata = state ? 1 : 0;
+ m_speaker->level_w(m_pc_spkrdata & m_pit_out2);
+}
+
+
+/*************************************************************
+ *
+ * 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_pit_out2 = state ? 1 : 0;
+ m_speaker->level_w(m_pc_spkrdata & m_pit_out2);
+}
+
+
+/**********************************************************
+ *
+ * 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( ibm5150_mb_device::keyboard_clock_w )
+{
+ if (!m_ppi_keyboard_clear && !state && !m_ppi_shift_enable)
+ {
+ m_ppi_shift_enable = m_ppi_shift_register & 0x01;
+
+ m_ppi_shift_register >>= 1;
+ m_ppi_shift_register |= m_ppi_data_signal << 7;
+
+ m_pic8259->ir1_w(m_ppi_shift_enable);
+ m_pc_kbdc->data_write_from_mb(!m_ppi_shift_enable);
+ }
+}
+
+WRITE_LINE_MEMBER( ec1841_mb_device::keyboard_clock_w )
+{
+ if (!m_ppi_keyboard_clear && !state && !m_ppi_shift_enable)
+ {
+ m_ppi_shift_enable = m_ppi_shift_register & 0x01;
+
+ m_ppi_shift_register >>= 1;
+ m_ppi_shift_register |= m_ppi_data_signal << 7;
+
+ m_pic8259->ir1_w(m_ppi_shift_enable);
+ m_pc_kbdc->data_write_from_mb(!m_ppi_shift_enable);
+ }
+}
+
+WRITE_LINE_MEMBER( ibm5160_mb_device::keyboard_clock_w )
+{
+ if (!m_ppi_keyboard_clear && !state && !m_ppi_shift_enable)
+ {
+ m_ppi_shift_enable = m_ppi_shift_register & 0x01;
+
+ m_ppi_shift_register >>= 1;
+ m_ppi_shift_register |= m_ppi_data_signal << 7;
+
+ m_pic8259->ir1_w(m_ppi_shift_enable);
+ m_pc_kbdc->data_write_from_mb(!BIT(m_ppi_portb, 2) && !m_ppi_shift_enable);
+ }
+}
+
+
+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",("$%02x\n", data));
+ return data;
+}
+
+
+READ8_MEMBER ( ibm5160_mb_device::pc_ppi_portc_r )
+{
+ int data=0xff;
+
+ data&=~0x80; // no parity error
+ data&=~0x40; // no error on expansion board
+ /* KB port C: equipment flags */
+ if (m_ppi_portc_switch_high)
+ {
+ /* read hi nibble of S2 */
+ data = (data & 0xf0) | ((ioport("DSW0")->read() >> 4) & 0x0f);
+ PIO_LOG(1,"PIO_C_r (hi)",("$%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 ) | ( m_pit_out2 ? 0x10 : 0x00 );
+ }
+ data = ( data & ~0x20 ) | ( m_pit_out2 ? 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;
+ m_pit8253->write_gate2(BIT(data, 0));
+ pc_speaker_set_spkrdata( data & 0x02 );
+
+ /* If PB7 is set clear the shift register and reset the IRQ line */
+ if ( m_ppi_keyboard_clear )
+ {
+ m_ppi_shift_register = 0;
+ m_ppi_shift_enable = 0;
+ m_pic8259->ir1_w(m_ppi_shift_enable);
+ }
+
+ m_pc_kbdc->data_write_from_mb(!BIT(m_ppi_portb, 2) && !m_ppi_shift_enable);
+ m_ppi_clock_signal = ( m_ppi_keyb_clock ) ? 1 : 0;
+ m_pc_kbdc->clock_write_from_mb(m_ppi_clock_signal);
+}
+
+
+/**********************************************************
+ *
+ * NMI handling
+ *
+ **********************************************************/
+
+WRITE8_MEMBER( ibm5160_mb_device::nmi_enable_w )
+{
+ m_nmi_enabled = BIT(data,7);
+ m_isabus->set_nmi_state(m_nmi_enabled);
+}
+//**************************************************************************
+// GLOBAL VARIABLES
+//**************************************************************************
+
+const device_type IBM5160_MOTHERBOARD = &device_creator<ibm5160_mb_device>;
+
+//**************************************************************************
+// DEVICE CONFIGURATION
+//**************************************************************************
+
+static MACHINE_CONFIG_FRAGMENT( ibm5160_mb_config )
+ MCFG_DEVICE_ADD("pit8253", PIT8253, 0)
+ MCFG_PIT8253_CLK0(XTAL_14_31818MHz/12) /* heartbeat IRQ */
+ MCFG_PIT8253_OUT0_HANDLER(DEVWRITELINE("pic8259", pic8259_device, ir0_w))
+ MCFG_PIT8253_CLK1(XTAL_14_31818MHz/12) /* dram refresh */
+ MCFG_PIT8253_OUT1_HANDLER(WRITELINE(ibm5160_mb_device, pc_pit8253_out1_changed))
+ MCFG_PIT8253_CLK2(XTAL_14_31818MHz/12) /* pio port c pin 4, and speaker polling enough */
+ MCFG_PIT8253_OUT2_HANDLER(WRITELINE(ibm5160_mb_device, pc_pit8253_out2_changed))
+
+ MCFG_DEVICE_ADD( "dma8237", AM9517A, XTAL_14_31818MHz/3 )
+ MCFG_I8237_OUT_HREQ_CB(WRITELINE(ibm5160_mb_device, pc_dma_hrq_changed))
+ MCFG_I8237_OUT_EOP_CB(WRITELINE(ibm5160_mb_device, pc_dma8237_out_eop))
+ MCFG_I8237_IN_MEMR_CB(READ8(ibm5160_mb_device, pc_dma_read_byte))
+ MCFG_I8237_OUT_MEMW_CB(WRITE8(ibm5160_mb_device, pc_dma_write_byte))
+ MCFG_I8237_IN_IOR_1_CB(READ8(ibm5160_mb_device, pc_dma8237_1_dack_r))
+ MCFG_I8237_IN_IOR_2_CB(READ8(ibm5160_mb_device, pc_dma8237_2_dack_r))
+ MCFG_I8237_IN_IOR_3_CB(READ8(ibm5160_mb_device, pc_dma8237_3_dack_r))
+ MCFG_I8237_OUT_IOW_0_CB(WRITE8(ibm5160_mb_device, pc_dma8237_0_dack_w))
+ MCFG_I8237_OUT_IOW_1_CB(WRITE8(ibm5160_mb_device, pc_dma8237_1_dack_w))
+ MCFG_I8237_OUT_IOW_2_CB(WRITE8(ibm5160_mb_device, pc_dma8237_2_dack_w))
+ MCFG_I8237_OUT_IOW_3_CB(WRITE8(ibm5160_mb_device, pc_dma8237_3_dack_w))
+ MCFG_I8237_OUT_DACK_0_CB(WRITELINE(ibm5160_mb_device, pc_dack0_w))
+ MCFG_I8237_OUT_DACK_1_CB(WRITELINE(ibm5160_mb_device, pc_dack1_w))
+ MCFG_I8237_OUT_DACK_2_CB(WRITELINE(ibm5160_mb_device, pc_dack2_w))
+ MCFG_I8237_OUT_DACK_3_CB(WRITELINE(ibm5160_mb_device, pc_dack3_w))
+
+ MCFG_PIC8259_ADD( "pic8259", INPUTLINE(":maincpu", 0), VCC, NULL )
+
+ MCFG_DEVICE_ADD("ppi8255", I8255A, 0)
+ MCFG_I8255_IN_PORTA_CB(READ8(ibm5160_mb_device, pc_ppi_porta_r))
+ MCFG_I8255_OUT_PORTB_CB(WRITE8(ibm5160_mb_device, pc_ppi_portb_w))
+ MCFG_I8255_IN_PORTC_CB(READ8(ibm5160_mb_device, pc_ppi_portc_r))
+
+ MCFG_DEVICE_ADD("isa", ISA8, 0)
+ MCFG_ISA8_CPU(":maincpu")
+ MCFG_ISA_OUT_IRQ2_CB(DEVWRITELINE("pic8259", pic8259_device, ir2_w))
+ MCFG_ISA_OUT_IRQ3_CB(DEVWRITELINE("pic8259", pic8259_device, ir3_w))
+ MCFG_ISA_OUT_IRQ4_CB(DEVWRITELINE("pic8259", pic8259_device, ir4_w))
+ MCFG_ISA_OUT_IRQ5_CB(DEVWRITELINE("pic8259", pic8259_device, ir5_w))
+ MCFG_ISA_OUT_IRQ6_CB(DEVWRITELINE("pic8259", pic8259_device, ir6_w))
+ MCFG_ISA_OUT_IRQ7_CB(DEVWRITELINE("pic8259", pic8259_device, ir7_w))
+ MCFG_ISA_OUT_DRQ1_CB(DEVWRITELINE("dma8237", am9517a_device, dreq1_w))
+ MCFG_ISA_OUT_DRQ2_CB(DEVWRITELINE("dma8237", am9517a_device, dreq2_w))
+ MCFG_ISA_OUT_DRQ3_CB(DEVWRITELINE("dma8237", am9517a_device, dreq3_w))
+
+ MCFG_DEVICE_ADD("pc_kbdc", PC_KBDC, 0)
+ MCFG_PC_KBDC_OUT_CLOCK_CB(WRITELINE(ibm5160_mb_device, keyboard_clock_w))
+ MCFG_PC_KBDC_OUT_DATA_CB(WRITELINE(ibm5160_mb_device, keyboard_data_w))
+
+ /* sound hardware */
+ MCFG_SPEAKER_STANDARD_MONO("mono")
+ MCFG_SOUND_ADD("speaker", 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<ibm5160_mb_device &>(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, "ibm5160_mb", __FILE__),
+ m_maincpu(*owner, "maincpu"),
+ m_pic8259(*this, "pic8259"),
+ m_dma8237(*this, "dma8237"),
+ m_pit8253(*this, "pit8253"),
+ m_ppi8255(*this, "ppi8255"),
+ m_speaker(*this, "speaker"),
+ m_isabus(*this, "isa"),
+ m_pc_kbdc(*this, "pc_kbdc"),
+ m_ram(*this, ":" RAM_TAG)
+{
+}
+
+DEVICE_ADDRESS_MAP_START( map, 8, ibm5160_mb_device )
+ AM_RANGE(0x0000, 0x000f) AM_DEVREADWRITE("dma8237", am9517a_device, read, write)
+ AM_RANGE(0x0020, 0x002f) AM_DEVREADWRITE("pic8259", pic8259_device, read, write)
+ AM_RANGE(0x0040, 0x004f) AM_DEVREADWRITE("pit8253", pit8253_device, read, write)
+ AM_RANGE(0x0060, 0x006f) AM_DEVREADWRITE("ppi8255", i8255_device, read, write)
+ AM_RANGE(0x0080, 0x008f) AM_WRITE(pc_page_w)
+ AM_RANGE(0x00a0, 0x00a1) AM_WRITE(nmi_enable_w)
+ADDRESS_MAP_END
+
+//-------------------------------------------------
+// device_start - device-specific startup
+//-------------------------------------------------
+
+void ibm5160_mb_device::device_start()
+{
+ if(!m_ram->started())
+ throw device_missing_dependencies();
+ m_maincpu->space(AS_PROGRAM).install_ram(0, m_ram->size() - 1, m_ram->pointer());
+}
+
+
+//-------------------------------------------------
+// device_reset - device-specific reset
+//-------------------------------------------------
+
+void ibm5160_mb_device::device_reset()
+{
+ m_u73_q2 = 0;
+ m_out1 = 2; // initial state of pit output is undefined
+ m_pc_spkrdata = 0;
+ m_pit_out2 = 1;
+ 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;
+ m_speaker->level_w(0);
+}
+
+
+//**************************************************************************
+// GLOBAL VARIABLES
+//**************************************************************************
+
+const device_type IBM5150_MOTHERBOARD = &device_creator<ibm5150_mb_device>;
+
+//**************************************************************************
+// DEVICE CONFIGURATION
+//**************************************************************************
+static MACHINE_CONFIG_FRAGMENT( ibm5150_mb_config )
+ MCFG_FRAGMENT_ADD(ibm5160_mb_config)
+
+ MCFG_DEVICE_MODIFY("pc_kbdc")
+ MCFG_PC_KBDC_OUT_CLOCK_CB(WRITELINE(ibm5150_mb_device, keyboard_clock_w))
+
+ MCFG_DEVICE_MODIFY("ppi8255")
+ MCFG_I8255_OUT_PORTB_CB(WRITE8(ibm5150_mb_device, pc_ppi_portb_w))
+ MCFG_I8255_IN_PORTC_CB(READ8(ibm5150_mb_device, pc_ppi_portc_r))
+
+ MCFG_CASSETTE_ADD( "cassette" )
+ MCFG_CASSETTE_DEFAULT_STATE(CASSETTE_PLAY | CASSETTE_MOTOR_DISABLED | CASSETTE_SPEAKER_ENABLED)
+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")
+{
+}
+
+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 ( m_ram->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 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 ( m_ram->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 ( m_ram->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 ) | ( m_pit_out2 ? 0x10 : 0x00 );
+ }
+ }
+ data = ( data & ~0x20 ) | ( m_pit_out2 ? 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;
+ m_pit8253->write_gate2(BIT(data, 0));
+ pc_speaker_set_spkrdata( data & 0x02 );
+
+ m_cassette->change_state(( data & 0x08 ) ? CASSETTE_MOTOR_DISABLED : CASSETTE_MOTOR_ENABLED,CASSETTE_MASK_MOTOR);
+
+ /* If PB7 is set clear the shift register and reset the IRQ line */
+ if ( m_ppi_keyboard_clear )
+ {
+ m_ppi_shift_register = 0;
+ m_ppi_shift_enable = 0;
+ m_pic8259->ir1_w(m_ppi_shift_enable);
+ }
+
+ m_pc_kbdc->data_write_from_mb(!m_ppi_shift_enable);
+ m_ppi_clock_signal = ( m_ppi_keyb_clock ) ? 1 : 0;
+ m_pc_kbdc->clock_write_from_mb(m_ppi_clock_signal);
+}
+
+//**************************************************************************
+// GLOBAL VARIABLES
+//**************************************************************************
+
+const device_type EC1841_MOTHERBOARD = &device_creator<ec1841_mb_device>;
+
+static MACHINE_CONFIG_FRAGMENT( ec1841_mb_config )
+ MCFG_FRAGMENT_ADD(ibm5160_mb_config)
+
+ MCFG_DEVICE_MODIFY("ppi8255")
+ MCFG_I8255_OUT_PORTB_CB(WRITE8(ec1841_mb_device, pc_ppi_portb_w))
+ MCFG_I8255_IN_PORTC_CB(READ8(ec1841_mb_device, pc_ppi_portc_r))
+
+ MCFG_DEVICE_MODIFY("pc_kbdc")
+ MCFG_PC_KBDC_OUT_CLOCK_CB(WRITELINE(ec1841_mb_device, keyboard_clock_w))
+MACHINE_CONFIG_END
+
+
+//-------------------------------------------------
+// machine_config_additions - device-specific
+// machine configurations
+//-------------------------------------------------
+
+machine_config_constructor ec1841_mb_device::device_mconfig_additions() const
+{
+ return MACHINE_CONFIG_NAME( ec1841_mb_config );
+}
+
+static INPUT_PORTS_START( ec1841_mb )
+ PORT_START("DSW0") /* SA1 */
+ 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, 0x20, "Graphics adapter")
+ PORT_DIPSETTING( 0x00, "Reserved" )
+ PORT_DIPSETTING( 0x10, "Color 40x25" )
+ PORT_DIPSETTING( 0x20, "Color 80x25" )
+ PORT_DIPSETTING( 0x30, "Monochrome" )
+ PORT_BIT( 0x08, 0x08, IPT_UNUSED )
+ /* BIOS does not support booting from QD floppies */
+ PORT_DIPNAME( 0x04, 0x04, "Floppy type")
+ PORT_DIPSETTING( 0x00, "80 tracks" )
+ PORT_DIPSETTING( 0x04, "40 tracks" )
+ 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) )
+
+ PORT_START("SA2")
+ PORT_DIPNAME( 0x04, 0x04, "Speech synthesizer")
+ PORT_DIPSETTING( 0x00, "Installed" )
+ PORT_DIPSETTING( 0x04, "Not installed" )
+INPUT_PORTS_END
+
+//-------------------------------------------------
+// input_ports - device-specific input ports
+//-------------------------------------------------
+
+ioport_constructor ec1841_mb_device::device_input_ports() const
+{
+ return INPUT_PORTS_NAME( ec1841_mb );
+}
+
+//**************************************************************************
+// LIVE DEVICE
+//**************************************************************************
+
+//-------------------------------------------------
+// ec1841_mb_device - constructor
+//-------------------------------------------------
+
+ec1841_mb_device::ec1841_mb_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock)
+ : ibm5160_mb_device(mconfig, tag, owner, clock)
+{
+}
+
+void ec1841_mb_device::device_start()
+{
+}
+
+// kbd interface is 5150-like but PB2 controls access to second bank of DIP switches (SA2).
+WRITE8_MEMBER( ec1841_mb_device::pc_ppi_portb_w )
+{
+ /* KB controller port B */
+ m_ppi_portb = data;
+ m_ppi_portc_switch_high = data & 0x04;
+ m_ppi_keyboard_clear = data & 0x80;
+ m_ppi_keyb_clock = data & 0x40;
+ m_pit8253->write_gate2(BIT(data, 0));
+ pc_speaker_set_spkrdata( data & 0x02 );
+
+ /* If PB7 is set clear the shift register and reset the IRQ line */
+ if ( m_ppi_keyboard_clear )
+ {
+ m_ppi_shift_register = 0;
+ m_ppi_shift_enable = 0;
+ m_pic8259->ir1_w(m_ppi_shift_enable);
+ }
+
+ m_pc_kbdc->data_write_from_mb(!m_ppi_shift_enable);
+ m_ppi_clock_signal = ( m_ppi_keyb_clock ) ? 1 : 0;
+ m_pc_kbdc->clock_write_from_mb(m_ppi_clock_signal);
+}
+
+READ8_MEMBER ( ec1841_mb_device::pc_ppi_portc_r )
+{
+ int data=0xff;
+
+ data&=~0x80; // no parity error
+ data&=~0x40; // no error on expansion board
+
+ if (m_ppi_portc_switch_high)
+ {
+ data = (data & 0xf0) | (ioport("SA2")->read() & 0x0f);
+ }
+
+ data = ( data & ~0x20 ) | ( m_pit_out2 ? 0x20 : 0x00 );
+
+ return data;
+}
+
+pc_noppi_mb_device::pc_noppi_mb_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock)
+ : ibm5160_mb_device(mconfig, tag, owner, clock)
+{
+}
+
+//**************************************************************************
+// DEVICE CONFIGURATION
+//**************************************************************************
+
+static MACHINE_CONFIG_FRAGMENT( pc_noppi_mb_config )
+ MCFG_FRAGMENT_ADD(ibm5160_mb_config)
+
+ MCFG_DEVICE_REMOVE("pc_kbdc")
+ MCFG_DEVICE_REMOVE("ppi8255")
+MACHINE_CONFIG_END
+
+static INPUT_PORTS_START( pc_noppi_mb )
+INPUT_PORTS_END
+
+//-------------------------------------------------
+// machine_config_additions - device-specific
+// machine configurations
+//-------------------------------------------------
+
+machine_config_constructor pc_noppi_mb_device::device_mconfig_additions() const
+{
+ return MACHINE_CONFIG_NAME( pc_noppi_mb_config );
+}
+
+ioport_constructor pc_noppi_mb_device::device_input_ports() const
+{
+ return INPUT_PORTS_NAME( pc_noppi_mb );
+}
+
+DEVICE_ADDRESS_MAP_START( map, 8, pc_noppi_mb_device )
+ AM_RANGE(0x0000, 0x000f) AM_DEVREADWRITE("dma8237", am9517a_device, read, write)
+ AM_RANGE(0x0020, 0x002f) AM_DEVREADWRITE("pic8259", pic8259_device, read, write)
+ AM_RANGE(0x0040, 0x004f) AM_DEVREADWRITE("pit8253", pit8253_device, read, write)
+ AM_RANGE(0x0080, 0x008f) AM_WRITE(pc_page_w)
+ AM_RANGE(0x00a0, 0x00a1) AM_WRITE(nmi_enable_w)
+ADDRESS_MAP_END
+
+const device_type PCNOPPI_MOTHERBOARD = &device_creator<pc_noppi_mb_device>;