Sprinter/mame
2
0
Fork 0
mirror of https://github.com/holub/mame synced 2025-06-05 12:26:35 +03:00
Code Issues Actions 4 Packages Projects Releases Wiki Activity
e5bbf53153
mame/src/mess/machine/genpc.c

883 lines
25 KiB
C
Raw Blame History

/***************************************************************************
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<ibm5160_mb_device *>(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 )
{
device_set_input_line(m_maincpu, 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("pic8259", pic8259_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 )
{
pic8259_ir1_w(m_pic8259, 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("pic8259", pic8259_ir2_w),
DEVCB_DEVICE_LINE("pic8259", pic8259_ir3_w),
DEVCB_DEVICE_LINE("pic8259", pic8259_ir4_w),
DEVCB_DEVICE_LINE("pic8259", pic8259_ir5_w),
DEVCB_DEVICE_LINE("pic8259", pic8259_ir6_w),
DEVCB_DEVICE_LINE("pic8259", pic8259_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<ibm5160_mb_device *>(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<ibm5160_mb_device>;
//**************************************************************************
// 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, "Any floppy drive installed")
PORT_DIPSETTING( 0x00, DEF_STR(No) )
PORT_DIPSETTING( 0x01, DEF_STR(Yes) )
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),
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->memory().space_config(AS_IO)->m_databus_width;
switch(buswidth)
{
case 8:
m_maincpu->memory().space(AS_IO)->install_legacy_readwrite_handler(*dev, start, end, mask, mirror, rhandler, rhandler_name, whandler, whandler_name, 0);
break;
case 16:
m_maincpu->memory().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->memory().space_config(AS_IO)->m_databus_width;
switch(buswidth)
{
case 8:
m_maincpu->memory().space(AS_IO)->install_legacy_write_handler(*dev, start, end, mask, mirror, whandler, whandler_name,0);
break;
case 16:
m_maincpu->memory().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->memory().space_config(AS_IO)->m_databus_width;
switch(buswidth)
{
case 8:
m_maincpu->memory().space(AS_IO)->install_readwrite_handler(start, end, mask, mirror, rhandler, whandler, 0);
break;
case 16:
m_maincpu->memory().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->memory().space_config(AS_IO)->m_databus_width;
switch(buswidth)
{
case 8:
m_maincpu->memory().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->memory().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_device>(RAM_TAG)->pointer() )
membank( "bank10" )->set_base( machine().device<ram_device>(RAM_TAG)->pointer() );
}
IRQ_CALLBACK(ibm5160_mb_device::pc_irq_callback)
{
device_t *pic = device->machine().device("mb:pic8259");
return pic8259_acknowledge( pic );
}
//-------------------------------------------------
// device_reset - device-specific reset
//-------------------------------------------------
void ibm5160_mb_device::device_reset()
{
device_set_irq_callback(m_maincpu, pc_irq_callback);
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<ibm5150_mb_device>;
//**************************************************************************
// 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_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_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_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 )
{
pic8259_ir1_w(m_pic8259, 0);
m_ppi_shift_register = 0;
m_ppi_shift_enable = 1;
}
}
Reference in New Issue View Git Blame Copy Permalink