// 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 "cpu/z80/z80.h"
#include "machine/i8255.h"
#include "machine/z80ctc.h"
#include "machine/z80daisy.h"
//**************************************************************************
// DEBUGGING
//**************************************************************************
#define LOG_PORT_IO (1U << 1)
#define LOG_STATUS_CHANGES (1U << 2)
#define LOG_FRAMES_SEEN (1U << 3)
#define LOG_COMMANDS (1U << 4)
#define VERBOSE (0)
#include "logmacro.h"
//**************************************************************************
// 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
DEFINE_DEVICE_TYPE(PIONEER_LDV1000, pioneer_ldv1000_device, "ldv1000", "Pioneer LD-V1000")
//**************************************************************************
// LD-V1000 ROM AND MACHINE INTERFACES
//**************************************************************************
void pioneer_ldv1000_device::ldv1000_map(address_map &map)
{
map(0x0000, 0x1fff).mirror(0x6000).rom();
map(0x8000, 0x87ff).mirror(0x3800).ram();
map(0xc000, 0xc003).mirror(0x1ff0).rw("ldvppi0", FUNC(i8255_device::read), FUNC(i8255_device::write));
map(0xc004, 0xc007).mirror(0x1ff0).rw("ldvppi1", FUNC(i8255_device::read), FUNC(i8255_device::write));
}
void pioneer_ldv1000_device::ldv1000_portmap(address_map &map)
{
map.global_mask(0xff);
map(0x00, 0x07).mirror(0x38).rw(FUNC(pioneer_ldv1000_device::z80_decoder_display_port_r), FUNC(pioneer_ldv1000_device::z80_decoder_display_port_w));
map(0x40, 0x40).mirror(0x3f).r(FUNC(pioneer_ldv1000_device::z80_controller_r));
map(0x80, 0x80).mirror(0x3f).w(FUNC(pioneer_ldv1000_device::z80_controller_w));
map(0xc0, 0xc3).mirror(0x3c).rw(m_z80_ctc, FUNC(z80ctc_device::read), FUNC(z80ctc_device::write));
}
static const z80_daisy_config daisy_chain[] =
{
{ "ldvctc" },
{ nullptr }
};
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, const char *tag, device_t *owner, uint32_t clock)
: parallel_laserdisc_device(mconfig, PIONEER_LDV1000, tag, owner, clock),
m_z80_cpu(*this, "ldv1000"),
m_z80_ctc(*this, "ldvctc"),
m_multitimer(nullptr),
m_command_strobe_cb(*this),
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_t data)
{
m_command = data;
LOGMASKED(LOG_COMMANDS, "-> COMMAND = %02X (%s)\n", data, (m_portc1 & 0x10) ? "valid" : "invalid");
}
//-------------------------------------------------
// 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(FUNC(pioneer_ldv1000_device::multijump_tick), this);
m_vsync_off_timer = timer_alloc(FUNC(pioneer_ldv1000_device::vsync_off), this);
m_process_vbi_timer = timer_alloc(FUNC(pioneer_ldv1000_device::process_vbi_data), this);
}
//-------------------------------------------------
// 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;
}
//-------------------------------------------------
// vsync_off - clear the VSYNC flag
//-------------------------------------------------
TIMER_CALLBACK_MEMBER(pioneer_ldv1000_device::vsync_off)
{
m_vsync = false;
}
//-------------------------------------------------
// multijump_tick - move the slider across
// multiple tracks
//-------------------------------------------------
TIMER_CALLBACK_MEMBER(pioneer_ldv1000_device::multijump_tick)
{
// 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)
m_multitimer->adjust(MULTIJUMP_TRACK_TIME);
}
//-------------------------------------------------
// process_vbi_data - process VBI data which was
// fetched by the parent device
//-------------------------------------------------
TIMER_CALLBACK_MEMBER(pioneer_ldv1000_device::process_vbi_data)
{
// appears to return data in reverse order
uint32_t 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_t *dest = &m_vbi[line * 7];
uint32_t 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;
}
//-------------------------------------------------
// device_rom_region - return a pointer to our
// ROM region definitions
//-------------------------------------------------
const tiny_rom_entry *pioneer_ldv1000_device::device_rom_region() const
{
return ROM_NAME(ldv1000);
}
//-------------------------------------------------
// device_add_mconfig - add device configuration
//-------------------------------------------------
void pioneer_ldv1000_device::device_add_mconfig(machine_config &config)
{
Z80(config, m_z80_cpu, XTAL(5'000'000)/2);
m_z80_cpu->set_daisy_config(daisy_chain);
m_z80_cpu->set_addrmap(AS_PROGRAM, &pioneer_ldv1000_device::ldv1000_map);
m_z80_cpu->set_addrmap(AS_IO, &pioneer_ldv1000_device::ldv1000_portmap);
Z80CTC(config, m_z80_ctc, XTAL(5'000'000)/2);
m_z80_ctc->intr_callback().set(FUNC(pioneer_ldv1000_device::ctc_interrupt));
i8255_device &ldvppi0(I8255(config, "ldvppi0"));
ldvppi0.out_pa_callback().set(FUNC(pioneer_ldv1000_device::ppi0_porta_w));
ldvppi0.in_pb_callback().set(FUNC(pioneer_ldv1000_device::ppi0_portb_r));
ldvppi0.in_pc_callback().set(FUNC(pioneer_ldv1000_device::ppi0_portc_r));
ldvppi0.out_pc_callback().set(FUNC(pioneer_ldv1000_device::ppi0_portc_w));
i8255_device &ldvppi1(I8255(config, "ldvppi1"));
ldvppi1.in_pa_callback().set(FUNC(pioneer_ldv1000_device::ppi1_porta_r));
ldvppi1.out_pb_callback().set(FUNC(pioneer_ldv1000_device::ppi1_portb_w));
ldvppi1.out_pc_callback().set(FUNC(pioneer_ldv1000_device::ppi1_portc_w));
}
//-------------------------------------------------
// 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;
m_vsync_off_timer->adjust(screen().scan_period() * 4);
// also set a timer to fetch the VBI data when it is ready
m_process_vbi_timer->adjust(screen().time_until_pos(19*2));
// boost interleave for the first 1ms to improve communications
machine().scheduler().perfect_quantum(attotime::from_msec(1));
}
//-------------------------------------------------
// player_update - update callback, called on
// the first visible line of the frame
//-------------------------------------------------
int32_t pioneer_ldv1000_device::player_update(const vbi_metadata &vbi, int fieldnum, const attotime &curtime)
{
int frame = frame_from_metadata(vbi);
if (frame != FRAME_NOT_PRESENT)
LOGMASKED(LOG_FRAMES_SEEN, "== %d\n", frame);
return fieldnum;
}
//-------------------------------------------------
// ctc_interrupt - called when the CTC triggers
// an interrupt in the daisy chain
//-------------------------------------------------
void pioneer_ldv1000_device::ctc_interrupt(int state)
{
m_z80_cpu->set_input_line(0, state ? ASSERT_LINE : CLEAR_LINE);
}
//-------------------------------------------------
// z80_decoder_display_port_w - handle writes to
// the decoder/display chips
//-------------------------------------------------
void pioneer_ldv1000_device::z80_decoder_display_port_w(offs_t offset, uint8_t data)
{
/*
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
//-------------------------------------------------
uint8_t pioneer_ldv1000_device::z80_decoder_display_port_r(offs_t offset)
{
// reads from offset 3 constitute actual reads from the display and decoder chips
uint8_t result = 0;
if (offset == 3)
{
// selection 4 represents the VBI data reading
if (m_portselect == 4)
{
m_vbiready = false;
result = m_vbi[m_vbiindex++ % std::size(m_vbi)];
}
}
return result;
}
//-------------------------------------------------
// z80_controller_r - handle read of the data from
// the controlling system
//-------------------------------------------------
uint8_t pioneer_ldv1000_device::z80_controller_r()
{
// note that this is a cheesy implementation; the real thing relies on exquisite timing
uint8_t result = m_command ^ 0xff;
m_command = 0xff;
return result;
}
//-------------------------------------------------
// z80_controller_w - handle status latch writes
//-------------------------------------------------
void pioneer_ldv1000_device::z80_controller_w(uint8_t data)
{
if (data != m_status)
LOGMASKED(LOG_STATUS_CHANGES, "%s:CONTROLLER.W=%02X\n", machine().describe_context(), data);
m_status = data;
}
//-------------------------------------------------
// ppi0_porta_w - handle writes to port A of
// PPI #0
//-------------------------------------------------
void pioneer_ldv1000_device::ppi0_porta_w(uint8_t data)
{
m_counter_start = data;
LOGMASKED(LOG_PORT_IO, "%s:PORTA.0=%02X\n", machine().describe_context(), data);
}
//-------------------------------------------------
// ppi0_portb_r - handle reads from port B of
// PPI #0
//-------------------------------------------------
uint8_t pioneer_ldv1000_device::ppi0_portb_r()
{
return m_counter;
}
//-------------------------------------------------
// ppi0_portc_r - handle reads from port C of
// PPI #0
//-------------------------------------------------
uint8_t 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_t 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
//-------------------------------------------------
void pioneer_ldv1000_device::ppi0_portc_w(uint8_t data)
{
/*
$01 = preload on up/down counters
$02 = /MULTI JUMP TRIG
$04 = SCAN MODE
$08 = n/c
*/
// set the new value
uint8_t prev = m_portc0;
m_portc0 = data;
if ((data ^ prev) & 0x0f)
{
LOGMASKED(LOG_PORT_IO, "%s:PORTC.0=%02X%s%s%s\n", machine().describe_context(), data,
(data & 0x01) ? " PRELOAD" : "",
!(data & 0x02) ? " /MULTIJUMP" : "",
(data & 0x04) ? " SCANMODE" : "");
}
// 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
//-------------------------------------------------
uint8_t 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_t 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
//-------------------------------------------------
void pioneer_ldv1000_device::ppi1_portb_w(uint8_t data)
{
/*
$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_t prev = m_portb1;
m_portb1 = data;
if ((data ^ prev) & 0xff)
{
LOGMASKED(LOG_PORT_IO, "%s:PORTB.1=%02X: %s%s%s%s%s%s\n", machine().describe_context(), data,
!(data & 0x01) ? " FOCSON" : "",
!(data & 0x02) ? " SPDLRUN" : "",
!(data & 0x04) ? " JUMPTRIG" : "",
!(data & 0x08) ? string_format(" SCANA (%c %c)", (data & 0x10) ? 'L' : 'H', (data & 0x20) ? 'F' : 'R') : "",
(data & 0x40) ? " LASERON" : "",
!(data & 0x80) ? " SYNCST0" : "");
}
// 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
//-------------------------------------------------
void pioneer_ldv1000_device::ppi1_portc_w(uint8_t data)
{
/*
$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_t prev = m_portc1;
m_portc1 = data;
if ((data ^ prev) & 0xcf)
{
LOGMASKED(LOG_PORT_IO, "%s:PORTC.1=%02X%s%s%s%s%s%s%s%s\n", machine().describe_context(), data,
(data & 0x01) ? " AUD1" : "",
(data & 0x02) ? " AUD2" : "",
(data & 0x04) ? " AUDEN" : "",
!(data & 0x08) ? " VIDEOSQ" : "",
(data & 0x10) ? " COMMAND" : "",
(data & 0x20) ? " STATUS" : "",
(data & 0x40) ? " SIZE8" : "",
!(data & 0x80) ? " CAV" : "");
}
// bit 4 sends a command strobe signal to Host CPU
m_command_strobe_cb(bool(data & 0x10));
// 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));
}