/************************************************************************* ldvp931.c Philips 22VP931 laserdisc emulation. **************************************************************************** Copyright Aaron Giles All rights reserved. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: * Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer. * Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution. * Neither the name 'MAME' nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission. THIS SOFTWARE IS PROVIDED BY AARON GILES ''AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL AARON GILES BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. ************************************************************************** Still to do: * determine actual slow/fast speeds * *************************************************************************/ #include "emu.h" #include "ldvp931.h" //************************************************************************** // DEBUGGING //************************************************************************** #define LOG_COMMANDS 0 #define LOG_PORTS 0 //************************************************************************** // CONSTANTS //************************************************************************** // scanning speeds #define SCAN_SPEED (2000 / 30) // 2000 frames/second #define SCAN_FAST_SPEED (4000 / 30) // 4000 frames/second //************************************************************************** // GLOBAL VARIABLES //************************************************************************** // devices const device_type PHILLIPS_22VP931 = &device_creator; //************************************************************************** // 22VP931 ROM AND MACHINE INTERFACES //************************************************************************** static ADDRESS_MAP_START( vp931_portmap, AS_IO, 8, phillips_22vp931_device ) AM_RANGE(0x00, 0x00) AM_MIRROR(0xcf) AM_READWRITE(i8049_keypad_r, i8049_output0_w) AM_RANGE(0x10, 0x10) AM_MIRROR(0xcf) AM_READWRITE(i8049_unknown_r, i8049_output1_w) AM_RANGE(0x20, 0x20) AM_MIRROR(0xcf) AM_READWRITE(i8049_datic_r, i8049_lcd_w) AM_RANGE(0x30, 0x30) AM_MIRROR(0xcf) AM_READWRITE(i8049_from_controller_r, i8049_to_controller_w) AM_RANGE(MCS48_PORT_P1, MCS48_PORT_P1) AM_READWRITE(i8049_port1_r, i8049_port1_w) AM_RANGE(MCS48_PORT_P2, MCS48_PORT_P2) AM_READWRITE(i8049_port2_r, i8049_port2_w) AM_RANGE(MCS48_PORT_T0, MCS48_PORT_T0) AM_READ(i8049_t0_r) AM_RANGE(MCS48_PORT_T1, MCS48_PORT_T1) AM_READ(i8049_t1_r) ADDRESS_MAP_END static MACHINE_CONFIG_FRAGMENT( vp931 ) MCFG_CPU_ADD("vp931", I8049, XTAL_11MHz) MCFG_CPU_IO_MAP(vp931_portmap) MACHINE_CONFIG_END ROM_START( vp931 ) ROM_REGION( 0x800, "vp931", 0 ) ROM_LOAD( "at-6-1_a.bin", 0x000, 0x800, CRC(e11b3c8d) SHA1(ea2d7f6a044ed085ce5e09d8b1b1a21c37f0e9b8) ) ROM_END //************************************************************************** // PHILLIPS 22VP931 IMPLEMENTATION //************************************************************************** //------------------------------------------------- // phillips_22vp931_device - constructor //------------------------------------------------- phillips_22vp931_device::phillips_22vp931_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock) : laserdisc_device(mconfig, PHILLIPS_22VP931, "Phillips 22VP931", "22vp931", tag, owner, clock), m_i8049_cpu(*this, "vp931"), m_tracktimer(NULL), m_i8049_out0(0), m_i8049_out1(0), m_i8049_port1(0), m_daticval(0), m_daticerp(0), m_datastrobe(0), m_fromcontroller(0), m_fromcontroller_pending(false), m_tocontroller(0), m_tocontroller_pending(false), m_trackdir(0), m_trackstate(0), m_cmdcount(0), m_advanced(0) { } //------------------------------------------------- // reset_w - write to the reset line //------------------------------------------------- void phillips_22vp931_device::reset_w(UINT8 data) { // control the CPU state m_i8049_cpu->set_input_line(INPUT_LINE_RESET, data); // on an assert, reset the device state as well if (data == ASSERT_LINE) reset(); } //------------------------------------------------- // data_r - handle a parallel data read from the // 22VP931 //------------------------------------------------- UINT8 phillips_22vp931_device::data_r() { // if data is pending, clear the pending flag and notify any callbacks if (m_tocontroller_pending) { m_tocontroller_pending = false; if (!m_data_ready.isnull()) m_data_ready(*this, false); } // also boost interleave for 4 scanlines to ensure proper communications machine().scheduler().boost_interleave(attotime::zero, screen().scan_period() * 4); return m_tocontroller; } //------------------------------------------------- // device_start - device initialization //------------------------------------------------- void phillips_22vp931_device::device_start() { // pass through to the parent laserdisc_device::device_start(); // allocate a timer m_tracktimer = timer_alloc(TID_HALF_TRACK); } //------------------------------------------------- // device_reset - device reset //------------------------------------------------- void phillips_22vp931_device::device_reset() { // pass through to the parent laserdisc_device::device_reset(); // reset our state m_i8049_out0 = 0; m_i8049_out1 = 0; m_i8049_port1 = 0; m_daticval = 0; m_daticerp = 0; m_datastrobe = 0; m_fromcontroller = 0; m_fromcontroller_pending = false; m_tocontroller = 0; m_tocontroller_pending = false; m_trackdir = 0; m_trackstate = 0; m_cmdcount = 0; m_advanced = 0; } //------------------------------------------------- // device_timer - handle timers set by this // device //------------------------------------------------- void phillips_22vp931_device::device_timer(emu_timer &timer, device_timer_id id, int param, void *ptr) { switch (id) { case TID_VBI_DATA_FETCH: { UINT32 line = param >> 2; int which = param & 3; UINT32 code = 0; // fetch the code and compute the DATIC latched value if (line >= LASERDISC_CODE_LINE16 && line <= LASERDISC_CODE_LINE18) code = get_field_code(laserdisc_field_code(line), false); // at the start of each line, signal an interrupt and use a timer to turn it off if (which == 0) { m_i8049_cpu->set_input_line(MCS48_INPUT_IRQ, ASSERT_LINE); timer_set(attotime::from_nsec(5580), TID_IRQ_OFF); } // clock the data strobe on each subsequent callback else if (code != 0) { m_daticval = code >> (8 * (3 - which)); m_datastrobe = 1; timer_set(attotime::from_nsec(5000), TID_DATA_STROBE_OFF); } // determine the next bit to fetch and reprime ourself if (++which == 4) { which = 0; line++; } if (line <= LASERDISC_CODE_LINE18 + 1) timer_set(screen().time_until_pos(line*2, which * 2 * screen().width() / 4), TID_VBI_DATA_FETCH, (line << 2) + which); break; } case TID_DEFERRED_DATA: // set the value and mark it pending if (LOG_COMMANDS && m_fromcontroller_pending) printf("Dropped previous command byte\n"); m_fromcontroller = param; m_fromcontroller_pending = true; // track the commands for debugging purposes if (m_cmdcount < ARRAY_LENGTH(m_cmdbuf)) { m_cmdbuf[m_cmdcount++ % 3] = param; if (LOG_COMMANDS && m_cmdcount % 3 == 0) printf("Cmd: %02X %02X %02X\n", m_cmdbuf[0], m_cmdbuf[1], m_cmdbuf[2]); } break; case TID_IRQ_OFF: m_i8049_cpu->set_input_line(MCS48_INPUT_IRQ, CLEAR_LINE); break; case TID_DATA_STROBE_OFF: m_datastrobe = 0; break; case TID_ERP_OFF: m_daticerp = 0; break; case TID_HALF_TRACK: // advance by the count and toggle the state m_trackstate ^= 1; if ((m_trackdir < 0 && !m_trackstate) || (m_trackdir > 0 && m_trackstate)) { advance_slider(m_trackdir); m_advanced += m_trackdir; } 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 *phillips_22vp931_device::device_rom_region() const { return ROM_NAME(vp931); } //------------------------------------------------- // device_mconfig_additions - return a pointer to // our machine config fragment //------------------------------------------------- machine_config_constructor phillips_22vp931_device::device_mconfig_additions() const { return MACHINE_CONFIG_NAME(vp931); } //------------------------------------------------- // player_vsync - VSYNC callback, called at the // start of the blanking period //------------------------------------------------- void phillips_22vp931_device::player_vsync(const vbi_metadata &vbi, int fieldnum, attotime curtime) { // reset our command counter (debugging only) m_cmdcount = 0; // set the ERP signal to 1 to indicate start of frame, and set a timer to turn it off m_daticerp = 1; timer_set(screen().time_until_pos(15*2), TID_ERP_OFF); } //------------------------------------------------- // player_update - update callback, called on // the first visible line of the frame //------------------------------------------------- INT32 phillips_22vp931_device::player_update(const vbi_metadata &vbi, int fieldnum, attotime curtime) { // set the first VBI timer to go at the start of line 16 timer_set(screen().time_until_pos(16*2), TID_VBI_DATA_FETCH, LASERDISC_CODE_LINE16 << 2); // play forward by default return fieldnum; } //------------------------------------------------- // i8049_output0_w - controls audio/video squelch // and other bits //------------------------------------------------- WRITE8_MEMBER( phillips_22vp931_device::i8049_output0_w ) { /* $80 = n/c $40 = LED (?) -> C335 $20 = LED (?) $10 = LED (?) -> CX $08 = EJECT $04 = inverted -> AUDIO MUTE II $02 = inverted -> AUDIO MUTE I $01 = inverted -> VIDEO MUTE */ if (LOG_PORTS && (m_i8049_out0 ^ data) & 0xff) { printf("%03X:out0:", space.device().safe_pc()); if ( (data & 0x80)) printf(" ???"); if ( (data & 0x40)) printf(" LED1"); if ( (data & 0x20)) printf(" LED2"); if ( (data & 0x10)) printf(" LED3"); if ( (data & 0x08)) printf(" EJECT"); if (!(data & 0x04)) printf(" AUDMUTE2"); if (!(data & 0x02)) printf(" AUDMUTE1"); if (!(data & 0x01)) printf(" VIDMUTE"); printf("\n"); m_i8049_out0 = data; } // update a/v squelch set_audio_squelch(!(data & 0x02), !(data & 0x04)); set_video_squelch(!(data & 0x01)); } //------------------------------------------------- // i8049_output1_w - controls scanning behaviors //------------------------------------------------- WRITE8_MEMBER( phillips_22vp931_device::i8049_output1_w ) { /* $80 = n/c $40 = n/c $20 = n/c $10 = n/c $08 = inverted -> SMS $04 = inverted -> SSS $02 = inverted -> SCAN CMD $01 = OSM */ INT32 speed = 0; if (LOG_PORTS && (m_i8049_out1 ^ data) & 0x08) { mame_printf_debug("%03X:out1:", space.device().safe_pc()); if (!(data & 0x08)) mame_printf_debug(" SMS"); mame_printf_debug("\n"); m_i8049_out1 = data; } // speed is 0 unless SCAN CMD is clear speed = 0; if (!(data & 0x02)) { // fast/slow is based on bit 2 speed = (data & 0x04) ? SCAN_FAST_SPEED : SCAN_SPEED; // direction is based on bit 0 if (data & 0x01) speed = -speed; } // update the speed set_slider_speed(speed); } //------------------------------------------------- // i8049_lcd_w - vestigial LCD frame display //------------------------------------------------- WRITE8_MEMBER( phillips_22vp931_device::i8049_lcd_w ) { /* Frame number is written as 5 digits here; however, it is not actually connected */ } //------------------------------------------------- // i8049_unknown_r - unknown input port //------------------------------------------------- READ8_MEMBER( phillips_22vp931_device::i8049_unknown_r ) { // only bit $80 is checked and its effects are minor return 0x00; } //------------------------------------------------- // i8049_keypad_r - vestigial keypad/button // controls //------------------------------------------------- READ8_MEMBER( phillips_22vp931_device::i8049_keypad_r ) { /* From the code, this is apparently a vestigial keypad with basic controls: $01 = play $02 = still $04 = jump 25 frames backward $08 = jump 25 frames forward $10 = search for frame 50(?) $20 = search for frame 350(?) $40 = reset $80 = play reverse */ return 0x00; } //------------------------------------------------- // i8049_datic_r - read the latched value from the // DATIC circuit //------------------------------------------------- READ8_MEMBER( phillips_22vp931_device::i8049_datic_r ) { return m_daticval; } //------------------------------------------------- // i8049_from_controller_r - read the value the // external controller wrote //------------------------------------------------- READ8_MEMBER( phillips_22vp931_device::i8049_from_controller_r ) { // clear the pending flag and return the data m_fromcontroller_pending = false; return m_fromcontroller; } //------------------------------------------------- // i8049_to_controller_w - write a value back to // the external controller //------------------------------------------------- WRITE8_MEMBER( phillips_22vp931_device::i8049_to_controller_w ) { // set the pending flag and stash the data m_tocontroller_pending = TRUE; m_tocontroller = data; // signal to the callback if provided if (!m_data_ready.isnull()) m_data_ready(*this, true); // also boost interleave for 4 scanlines to ensure proper communications machine().scheduler().boost_interleave(attotime::zero, screen().scan_period() * 4); } //------------------------------------------------- // i8049_port1_r - read the 8048 I/O port 1 //------------------------------------------------- READ8_MEMBER( phillips_22vp931_device::i8049_port1_r ) { /* $80 = P17 = (in) unsure $40 = P16 = (in) /ERP from datic circuit $20 = P15 = (in) D105 */ UINT8 result = 0x00; if (!m_daticerp) result |= 0x40; return result; } //------------------------------------------------- // i8049_port1_w - write the 8048 I/O port 1 //------------------------------------------------- WRITE8_MEMBER( phillips_22vp931_device::i8049_port1_w ) { /* $10 = P14 = (out) D104 -> /SPEED $08 = P13 = (out) D103 -> /TIMER ENABLE $04 = P12 = (out) D102 -> /REV $02 = P11 = (out) D101 -> /FORW $01 = P10 = (out) D100 -> some op-amp then to C334, B56, B332 */ if (LOG_PORTS && (m_i8049_port1 ^ data) & 0x1f) { printf("%03X:port1:", space.device().safe_pc()); if (!(data & 0x10)) printf(" SPEED"); if (!(data & 0x08)) printf(" TIMENABLE"); if (!(data & 0x04)) printf(" REV"); if (!(data & 0x02)) printf(" FORW"); if (!(data & 0x01)) printf(" OPAMP"); printf("\n"); } // if bit 0 is set, we are not tracking if (data & 0x01) m_trackdir = 0; // if bit 0 is clear and we weren't tracking before, initialize the state else if (m_trackdir == 0) { m_advanced = 0; // if bit 2 is clear, we are moving backwards if (!(data & 0x04)) { m_trackdir = -1; m_trackstate = 1; } // if bit 1 is clear, we are moving forward else if (!(data & 0x02)) { m_trackdir = 1; m_trackstate = 0; } } // if we have a timer, adjust it if (m_tracktimer != NULL) { // turn it off if we're not tracking if (m_trackdir == 0) m_tracktimer->reset(); // if we just started tracking, or if the speed was changed, reprime the timer else if (((m_i8049_port1 ^ data) & 0x11) != 0) { // speeds here are just guesses, but work with the player logic; this is the time per half-track attotime speed = (data & 0x10) ? attotime::from_usec(60) : attotime::from_usec(10); // always start with an initial long delay; the code expects this m_tracktimer->adjust(attotime::from_usec(100), 0, speed); } } m_i8049_port1 = data; } //------------------------------------------------- // i8049_port2_r - read from the 8048 I/O port 2 //------------------------------------------------- READ8_MEMBER( phillips_22vp931_device::i8049_port2_r ) { /* $80 = P27 = (in) set/reset latch; set by FOC LS, reset by IGR $20 = P25 = (in) D125 -> 0 when data written to controller is preset, reset to 1 when read $10 = P24 = (in) D124 -> 0 when data from controller is present, reset to 1 on a read */ UINT8 result = 0x00; if (!m_tocontroller_pending) result |= 0x20; if (!m_fromcontroller_pending) result |= 0x10; return result; } //------------------------------------------------- // i8049_port2_w - write the 8048 I/O port 2 //------------------------------------------------- WRITE8_MEMBER( phillips_22vp931_device::i8049_port2_w ) { /* $40 = P26 = (out) cleared while data is sent back & forth; set afterwards [Not actually connected, but this is done in the code] */ } //------------------------------------------------- // i8049_t0_r - return the T0 line status, which is // connected to the DATIC's data strobe line //------------------------------------------------- READ8_MEMBER( phillips_22vp931_device::i8049_t0_r ) { return m_datastrobe; } //------------------------------------------------- // i8049_t1_r - return the T1 line status, which // is connected to the tracking state and is used // to count the number of tracks advanced //------------------------------------------------- READ8_MEMBER( phillips_22vp931_device::i8049_t1_r ) { return m_trackstate; }