// license:BSD-3-Clause
// copyright-holders:Aaron Giles
/*************************************************************************
ldv1000.c
Pioneer LD-V1000 laserdisc emulation.
**************************************************************************
Still to do:
* fix issues
* add OSD
*************************************************************************/
#include "emu.h"
#include "ldv1000.h"
#include "machine/i8255.h"
#include "machine/z80ctc.h"
#include "cpu/z80/z80.h"
#include "cpu/z80/z80daisy.h"
//**************************************************************************
// DEBUGGING
//**************************************************************************
#define LOG_PORT_IO 0
#define LOG_STATUS_CHANGES 0
#define LOG_FRAMES_SEEN 0
#define LOG_COMMANDS 0
//**************************************************************************
// CONSTANTS
//**************************************************************************
#define SCAN_SPEED (2000 / 30) // 2000 frames/second
#define SEEK_FAST_SPEED (4000 / 30) // 4000 frames/second
#define MULTIJUMP_TRACK_TIME attotime::from_usec(50)
//**************************************************************************
// GLOBAL VARIABLES
//**************************************************************************
// devices
const device_type PIONEER_LDV1000 = &device_creator<pioneer_ldv1000_device>;
//**************************************************************************
// LD-V1000 ROM AND MACHINE INTERFACES
//**************************************************************************
static ADDRESS_MAP_START( ldv1000_map, AS_PROGRAM, 8, pioneer_ldv1000_device )
AM_RANGE(0x0000, 0x1fff) AM_MIRROR(0x6000) AM_ROM
AM_RANGE(0x8000, 0x87ff) AM_MIRROR(0x3800) AM_RAM
AM_RANGE(0xc000, 0xc003) AM_MIRROR(0x9ff0) AM_DEVREADWRITE("ldvppi0", i8255_device, read, write)
AM_RANGE(0xc004, 0xc007) AM_MIRROR(0x9ff0) AM_DEVREADWRITE("ldvppi1", i8255_device, read, write)
ADDRESS_MAP_END
static ADDRESS_MAP_START( ldv1000_portmap, AS_IO, 8, pioneer_ldv1000_device )
ADDRESS_MAP_GLOBAL_MASK(0xff)
AM_RANGE(0x00, 0x07) AM_MIRROR(0x38) AM_READWRITE(z80_decoder_display_port_r, z80_decoder_display_port_w)
AM_RANGE(0x40, 0x40) AM_MIRROR(0x3f) AM_READ(z80_controller_r)
AM_RANGE(0x80, 0x80) AM_MIRROR(0x3f) AM_WRITE(z80_controller_w)
AM_RANGE(0xc0, 0xc3) AM_MIRROR(0x3c) AM_DEVREADWRITE("ldvctc", z80ctc_device, read, write)
ADDRESS_MAP_END
static const z80_daisy_config daisy_chain[] =
{
{ "ldvctc" },
{ nullptr }
};
static MACHINE_CONFIG_FRAGMENT( ldv1000 )
MCFG_CPU_ADD("ldv1000", Z80, XTAL_5MHz/2)
MCFG_CPU_CONFIG(daisy_chain)
MCFG_CPU_PROGRAM_MAP(ldv1000_map)
MCFG_CPU_IO_MAP(ldv1000_portmap)
MCFG_DEVICE_ADD("ldvctc", Z80CTC, XTAL_5MHz/2)
MCFG_Z80CTC_INTR_CB(WRITELINE(pioneer_ldv1000_device, ctc_interrupt))
MCFG_DEVICE_ADD("ldvppi0", I8255, 0)
MCFG_I8255_OUT_PORTA_CB(WRITE8(pioneer_ldv1000_device, ppi0_porta_w))
MCFG_I8255_IN_PORTB_CB(READ8(pioneer_ldv1000_device, ppi0_portb_r))
MCFG_I8255_IN_PORTC_CB(READ8(pioneer_ldv1000_device, ppi0_portc_r))
MCFG_I8255_OUT_PORTC_CB(WRITE8(pioneer_ldv1000_device, ppi0_portc_w))
MCFG_DEVICE_ADD("ldvppi1", I8255, 0)
MCFG_I8255_IN_PORTA_CB(READ8(pioneer_ldv1000_device, ppi1_porta_r))
MCFG_I8255_OUT_PORTB_CB(WRITE8(pioneer_ldv1000_device, ppi1_portb_w))
MCFG_I8255_OUT_PORTC_CB(WRITE8(pioneer_ldv1000_device, ppi1_portc_w))
MACHINE_CONFIG_END
ROM_START( ldv1000 )
ROM_REGION( 0x2000, "ldv1000", 0 )
ROM_LOAD( "z03_1001_vyw-053_v1-0.bin", 0x0000, 0x2000, CRC(31ec4687) SHA1(52f91c304a878ba02b2fa1cda1a9489d6dd5a34f) )
ROM_END
//**************************************************************************
// PIONEER LD-V1000 IMPLEMENTATION
//**************************************************************************
//-------------------------------------------------
// pioneer_ldv1000_device - constructor
//-------------------------------------------------
pioneer_ldv1000_device::pioneer_ldv1000_device(const machine_config &mconfig, std::string tag, device_t *owner, UINT32 clock)
: laserdisc_device(mconfig, PIONEER_LDV1000, "Pioneer LD-V1000", tag, owner, clock, "ldv1000", __FILE__),
m_z80_cpu(*this, "ldv1000"),
m_z80_ctc(*this, "ldvctc"),
m_multitimer(nullptr),
m_command(0),
m_status(0),
m_vsync(false),
m_counter_start(0),
m_counter(0),
m_portc0(0),
m_portb1(0),
m_portc1(0),
m_portselect(0),
m_dispindex(0),
m_vbiready(false),
m_vbiindex(0)
{
}
//-------------------------------------------------
// data_w - handle a parallel data write to the
// LD-V1000
//-------------------------------------------------
void pioneer_ldv1000_device::data_w(UINT8 data)
{
m_command = data;
if (LOG_COMMANDS)
printf("-> COMMAND = %02X (%s)\n", data, (m_portc1 & 0x10) ? "valid" : "invalid");
}
//-------------------------------------------------
// enter_w - set the state of the ENTER strobe
//-------------------------------------------------
void pioneer_ldv1000_device::enter_w(UINT8 data)
{
}
//-------------------------------------------------
// device_start - device initialization
//-------------------------------------------------
void pioneer_ldv1000_device::device_start()
{
// pass through to the parent
laserdisc_device::device_start();
// allocate timers
m_multitimer = timer_alloc(TID_MULTIJUMP);
}
//-------------------------------------------------
// device_reset - device reset
//-------------------------------------------------
void pioneer_ldv1000_device::device_reset()
{
// pass through to the parent
laserdisc_device::device_reset();
// reset our state
m_command = 0;
m_status = 0;
m_vsync = false;
m_counter_start = 0;
m_counter = 0;
m_portc0 = 0;
m_portb1 = 0;
m_portc1 = 0;
m_portselect = 0;
m_dispindex = 0;
m_vbiready = false;
m_vbiindex = 0;
}
//-------------------------------------------------
// device_timer - handle timers set by this
// device
//-------------------------------------------------
void pioneer_ldv1000_device::device_timer(emu_timer &timer, device_timer_id id, int param, void *ptr)
{
switch (id)
{
case TID_MULTIJUMP:
{
// bit 5 of port B on PPI 1 selects the direction of slider movement
int direction = (m_portb1 & 0x20) ? 1 : -1;
advance_slider(direction);
// update down counter and reschedule
if (--m_counter != 0)
timer.adjust(MULTIJUMP_TRACK_TIME);
break;
}
case TID_VSYNC_OFF:
m_vsync = false;
break;
case TID_VBI_DATA_FETCH:
{
// appears to return data in reverse order
UINT32 lines[3];
lines[0] = get_field_code(LASERDISC_CODE_LINE1718, false);
lines[1] = get_field_code(LASERDISC_CODE_LINE17, false);
lines[2] = get_field_code(LASERDISC_CODE_LINE16, false);
// fill in the details
memset(m_vbi, 0, sizeof(m_vbi));
if (focus_on() && laser_on())
{
// loop over lines
for (int line = 0; line < 3; line++)
{
UINT8 *dest = &m_vbi[line * 7];
UINT32 data = lines[line];
// the logic only processes leadin/leadout/frame number codes
if (data == VBI_CODE_LEADIN || data == VBI_CODE_LEADOUT || (data & VBI_MASK_CAV_PICTURE) == VBI_CODE_CAV_PICTURE)
{
*dest++ = 0x09 | (((data & VBI_MASK_CAV_PICTURE) == VBI_CODE_CAV_PICTURE) ? 0x02 : 0x00);
*dest++ = 0x08;
*dest++ = (data >> 16) & 0x0f;
*dest++ = (data >> 12) & 0x0f;
*dest++ = (data >> 8) & 0x0f;
*dest++ = (data >> 4) & 0x0f;
*dest++ = (data >> 0) & 0x0f;
}
}
}
// signal that data is ready and reset the readback index
m_vbiready = true;
m_vbiindex = 0;
break;
}
// pass everything else onto the parent
default:
laserdisc_device::device_timer(timer, id, param, ptr);
break;
}
}
//-------------------------------------------------
// device_rom_region - return a pointer to our
// ROM region definitions
//-------------------------------------------------
const rom_entry *pioneer_ldv1000_device::device_rom_region() const
{
return ROM_NAME(ldv1000);
}
//-------------------------------------------------
// device_mconfig_additions - return a pointer to
// our machine config fragment
//-------------------------------------------------
machine_config_constructor pioneer_ldv1000_device::device_mconfig_additions() const
{
return MACHINE_CONFIG_NAME(ldv1000);
}
//-------------------------------------------------
// player_vsync - VSYNC callback, called at the
// start of the blanking period
//-------------------------------------------------
void pioneer_ldv1000_device::player_vsync(const vbi_metadata &vbi, int fieldnum, const attotime &curtime)
{
// generate interrupts if we hit the edges
slider_position sliderpos = get_slider_position();
m_z80_ctc->trg1(sliderpos == SLIDER_MINIMUM);
m_z80_ctc->trg2(sliderpos == SLIDER_MAXIMUM);
// signal VSYNC and set a timer to turn it off
m_vsync = true;
timer_set(screen().scan_period() * 4, TID_VSYNC_OFF);
// also set a timer to fetch the VBI data when it is ready
timer_set(screen().time_until_pos(19*2), TID_VBI_DATA_FETCH);
// boost interleave for the first 1ms to improve communications
machine().scheduler().boost_interleave(attotime::zero, attotime::from_msec(1));
}
//-------------------------------------------------
// player_update - update callback, called on
// the first visible line of the frame
//-------------------------------------------------
INT32 pioneer_ldv1000_device::player_update(const vbi_metadata &vbi, int fieldnum, const attotime &curtime)
{
if (LOG_FRAMES_SEEN)
{
int frame = frame_from_metadata(vbi);
if (frame != FRAME_NOT_PRESENT) printf("== %d\n", frame);
}
return fieldnum;
}
//-------------------------------------------------
// ctc_interrupt - called when the CTC triggers
// an interrupt in the daisy chain
//-------------------------------------------------
WRITE_LINE_MEMBER( pioneer_ldv1000_device::ctc_interrupt )
{
m_z80_cpu->set_input_line(0, state ? ASSERT_LINE : CLEAR_LINE);
}
//-------------------------------------------------
// z80_decoder_display_port_w - handle writes to
// the decoder/display chips
//-------------------------------------------------
WRITE8_MEMBER( pioneer_ldv1000_device::z80_decoder_display_port_w )
{
/*
TX/RX = /A0 (A0=0 -> TX, A0=1 -> RX)
Display is 6-bit
Decoder is 4-bit
*/
// writes to offset 0 select the target for reads/writes of actual data
if (offset == 0)
{
m_portselect = data;
m_dispindex = 0;
}
// writes to offset 2 constitute actual writes targeted toward the display and decoder chips
else if (offset == 2)
{
// selections 0 and 1 represent the two display lines; only 6 bits are transferred
if (m_portselect < 2)
m_display[m_portselect][m_dispindex++ % 20] = data & 0x3f;
}
}
//-------------------------------------------------
// z80_decoder_display_port_r - handle reads from the
// decoder/display chips
//-------------------------------------------------
READ8_MEMBER( pioneer_ldv1000_device::z80_decoder_display_port_r )
{
// reads from offset 3 constitute actual reads from the display and decoder chips
UINT8 result = 0;
if (offset == 3)
{
// selection 4 represents the VBI data reading
if (m_portselect == 4)
{
m_vbiready = false;
result = m_vbi[m_vbiindex++ % ARRAY_LENGTH(m_vbi)];
}
}
return result;
}
//-------------------------------------------------
// z80_controller_r - handle read of the data from
// the controlling system
//-------------------------------------------------
READ8_MEMBER( pioneer_ldv1000_device::z80_controller_r )
{
// note that this is a cheesy implementation; the real thing relies on exquisite timing
UINT8 result = m_command ^ 0xff;
m_command = 0xff;
return result;
}
//-------------------------------------------------
// z80_controller_w - handle status latch writes
//-------------------------------------------------
WRITE8_MEMBER( pioneer_ldv1000_device::z80_controller_w )
{
if (LOG_STATUS_CHANGES && data != m_status)
printf("%04X:CONTROLLER.W=%02X\n", space.device().safe_pc(), data);
m_status = data;
}
//-------------------------------------------------
// ppi0_porta_w - handle writes to port A of
// PPI #0
//-------------------------------------------------
WRITE8_MEMBER( pioneer_ldv1000_device::ppi0_porta_w )
{
m_counter_start = data;
if (LOG_PORT_IO)
printf("%s:PORTA.0=%02X\n", machine().describe_context(), data);
}
//-------------------------------------------------
// ppi0_portb_r - handle reads from port B of
// PPI #0
//-------------------------------------------------
READ8_MEMBER( pioneer_ldv1000_device::ppi0_portb_r )
{
return m_counter;
}
//-------------------------------------------------
// ppi0_portc_r - handle reads from port C of
// PPI #0
//-------------------------------------------------
READ8_MEMBER( pioneer_ldv1000_device::ppi0_portc_r )
{
/*
$10 = /VSYNC
$20 = IRQ from decoder chip
$40 = TRKG LOOP (N24-1)
$80 = DUMP (N20-1) -- code reads the state and waits for it to change
*/
UINT8 result = 0x00;
if (!m_vsync)
result |= 0x10;
if (!m_vbiready)
result |= 0x20;
return result;
}
//-------------------------------------------------
// ppi0_portc_w - handle writes to port C of
// PPI #0
//-------------------------------------------------
WRITE8_MEMBER( pioneer_ldv1000_device::ppi0_portc_w )
{
/*
$01 = preload on up/down counters
$02 = /MULTI JUMP TRIG
$04 = SCAN MODE
$08 = n/c
*/
// set the new value
UINT8 prev = m_portc0;
m_portc0 = data;
if (LOG_PORT_IO && ((data ^ prev) & 0x0f) != 0)
{
printf("%s:PORTC.0=%02X", machine().describe_context(), data);
if (data & 0x01) printf(" PRELOAD");
if (!(data & 0x02)) printf(" /MULTIJUMP");
if (data & 0x04) printf(" SCANMODE");
printf("\n");
}
// on the rising edge of bit 0, clock the down counter load
if ((data & 0x01) && !(prev & 0x01))
m_counter = m_counter_start;
// on the falling edge of bit 1, start the multi-jump timer
if (!(data & 0x02) && (prev & 0x02))
m_multitimer->adjust(MULTIJUMP_TRACK_TIME);
}
//-------------------------------------------------
// ppi1_porta_r - handle reads from port A of
// PPI #1
//-------------------------------------------------
READ8_MEMBER( pioneer_ldv1000_device::ppi1_porta_r )
{
/*
$01 = /FOCS LOCK
$02 = /SPDL LOCK
$04 = INSIDE
$08 = OUTSIDE
$10 = MOTOR STOP
$20 = +5V/test point
$40 = /INT LOCK
$80 = 8 INCH CHK
*/
slider_position sliderpos = get_slider_position();
UINT8 result = 0x00;
// bit 0: /FOCUS LOCK
if (!focus_on())
result |= 0x01;
// bit 1: /SPDL LOCK
if (!spdl_on())
result |= 0x02;
// bit 2: INSIDE signal
if (sliderpos == SLIDER_MINIMUM)
result |= 0x04;
// bit 3: OUTSIDE signal
if (sliderpos == SLIDER_MAXIMUM)
result |= 0x08;
// bit 4: MOTOR STOP
// bit 5: +5V/test point
result |= 0x20;
// bit 6: /INT LOCK
// bit 7: 8 INCH CHK
return result;
}
//-------------------------------------------------
// ppi1_portb_w - handle writes to port B of
// PPI #1
//-------------------------------------------------
WRITE8_MEMBER( pioneer_ldv1000_device::ppi1_portb_w )
{
/*
$01 = /FOCS ON
$02 = /SPDL RUN
$04 = /JUMP TRIG
$08 = /SCAN A
$10 = SCAN B
$20 = SCAN C
$40 = /LASER ON
$80 = /SYNC ST0
*/
// set the new value
UINT8 prev = m_portb1;
m_portb1 = data;
if (LOG_PORT_IO && ((data ^ prev) & 0xff) != 0)
{
printf("%s:PORTB.1=%02X:", machine().describe_context(), data);
if (!(data & 0x01)) printf(" FOCSON");
if (!(data & 0x02)) printf(" SPDLRUN");
if (!(data & 0x04)) printf(" JUMPTRIG");
if (!(data & 0x08)) printf(" SCANA (%c %c)", (data & 0x10) ? 'L' : 'H', (data & 0x20) ? 'F' : 'R');
if ( (data & 0x40)) printf(" LASERON");
if (!(data & 0x80)) printf(" SYNCST0");
printf("\n");
}
// bit 5 selects the direction of slider movement for JUMP TRG and scanning
int direction = (data & 0x20) ? 1 : -1;
// on the falling edge of bit 2, jump one track in either direction
if (!(data & 0x04) && (prev & 0x04))
advance_slider(direction);
// bit 3 low enables scanning
if (!(data & 0x08))
{
// bit 4 selects the speed
int delta = (data & 0x10) ? SCAN_SPEED : SEEK_FAST_SPEED;
set_slider_speed(delta * direction);
}
// bit 3 high stops scanning
else
set_slider_speed(0);
}
//-------------------------------------------------
// ppi1_portc_w - handle writes to port C of
// PPI #1
//-------------------------------------------------
WRITE8_MEMBER( pioneer_ldv1000_device::ppi1_portc_w )
{
/*
$01 = AUD 1
$02 = AUD 2
$04 = AUDIO ENABLE
$08 = /VIDEO SQ
$10 = COMMAND
$20 = STATUS
$40 = SIZE 8/12
$80 = /LED CAV
*/
// set the new value
UINT8 prev = m_portc1;
m_portc1 = data;
if (LOG_PORT_IO && ((data ^ prev) & 0xcf) != 0)
{
printf("%s:PORTC.1=%02X", machine().describe_context(), data);
if (data & 0x01) printf(" AUD1");
if (data & 0x02) printf(" AUD2");
if (data & 0x04) printf(" AUDEN");
if (!(data & 0x08)) printf(" VIDEOSQ");
if (data & 0x10) printf(" COMMAND");
if (data & 0x20) printf(" STATUS");
if (data & 0x40) printf(" SIZE8");
if (!(data & 0x80)) printf(" CAV");
printf("\n");
}
// video squelch is controlled by bit 3
set_video_squelch((data & 0x08) == 0);
// audio squelch is controlled by bits 0-2
set_audio_squelch(!(data & 0x04) || !(data & 0x01), !(data & 0x04) || !(data & 0x02));
}