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676 lines
21 KiB
C++
676 lines
21 KiB
C++
//
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// MSX.cpp
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// Clock Signal
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//
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// Created by Thomas Harte on 24/11/2017.
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// Copyright © 2017 Thomas Harte. All rights reserved.
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//
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#include "MSX.hpp"
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#include "DiskROM.hpp"
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#include "Keyboard.hpp"
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#include "ROMSlotHandler.hpp"
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#include "../../Analyser/Static/MSX/Cartridge.hpp"
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#include "Cartridges/ASCII8kb.hpp"
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#include "Cartridges/ASCII16kb.hpp"
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#include "Cartridges/Konami.hpp"
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#include "Cartridges/KonamiWithSCC.hpp"
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#include "../../Processors/Z80/Z80.hpp"
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#include "../../Components/1770/1770.hpp"
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#include "../../Components/9918/9918.hpp"
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#include "../../Components/8255/i8255.hpp"
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#include "../../Components/AudioToggle/AudioToggle.hpp"
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#include "../../Components/AY38910/AY38910.hpp"
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#include "../../Components/KonamiSCC/KonamiSCC.hpp"
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#include "../../Storage/Tape/Parsers/MSX.hpp"
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#include "../../Storage/Tape/Tape.hpp"
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#include "../CRTMachine.hpp"
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#include "../ConfigurationTarget.hpp"
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#include "../KeyboardMachine.hpp"
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#include "../../Outputs/Speaker/Implementation/CompoundSource.hpp"
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#include "../../Outputs/Speaker/Implementation/LowpassSpeaker.hpp"
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#include "../../Outputs/Speaker/Implementation/SampleSource.hpp"
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#include "../../Configurable/StandardOptions.hpp"
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#include "../../ClockReceiver/ForceInline.hpp"
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#include "../../Analyser/Static/MSX/Target.hpp"
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namespace MSX {
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std::vector<std::unique_ptr<Configurable::Option>> get_options() {
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return Configurable::standard_options(
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static_cast<Configurable::StandardOptions>(Configurable::DisplayRGB | Configurable::DisplaySVideo | Configurable::DisplayComposite | Configurable::QuickLoadTape)
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);
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}
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class AYPortHandler: public GI::AY38910::PortHandler {
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public:
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AYPortHandler(Storage::Tape::BinaryTapePlayer &tape_player) : tape_player_(tape_player) {}
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void set_port_output(bool port_b, uint8_t value) {
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if(port_b) {
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// Bits 0–3: touchpad handshaking (?)
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// Bit 4—5: monostable timer pulses
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// Bit 6: joystick select
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// Bit 7: code LED, if any
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}
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}
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uint8_t get_port_input(bool port_b) {
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if(!port_b) {
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// Bits 0–5: Joystick (up, down, left, right, A, B)
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// Bit 6: keyboard switch (not universal)
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// Bit 7: tape input
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return 0x7f | (tape_player_.get_input() ? 0x00 : 0x80);
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}
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return 0xff;
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}
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private:
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Storage::Tape::BinaryTapePlayer &tape_player_;
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};
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class ConcreteMachine:
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public Machine,
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public CPU::Z80::BusHandler,
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public CRTMachine::Machine,
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public ConfigurationTarget::Machine,
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public KeyboardMachine::Machine,
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public Configurable::Device,
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public MemoryMap,
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public Sleeper::SleepObserver {
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public:
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ConcreteMachine():
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z80_(*this),
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i8255_(i8255_port_handler_),
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ay_(audio_queue_),
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audio_toggle_(audio_queue_),
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scc_(audio_queue_),
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mixer_(ay_, audio_toggle_, scc_),
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speaker_(mixer_),
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tape_player_(3579545 * 2),
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i8255_port_handler_(*this, audio_toggle_, tape_player_),
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ay_port_handler_(tape_player_) {
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set_clock_rate(3579545);
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std::memset(unpopulated_, 0xff, sizeof(unpopulated_));
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clear_all_keys();
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ay_.set_port_handler(&ay_port_handler_);
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speaker_.set_input_rate(3579545.0f / 2.0f);
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tape_player_.set_sleep_observer(this);
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// Set the AY to 50% of available volume, the toggle to 10% and leave 40% for an SCC.
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mixer_.set_relative_volumes({0.5f, 0.1f, 0.4f});
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}
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~ConcreteMachine() {
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audio_queue_.flush();
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}
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void setup_output(float aspect_ratio) override {
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vdp_.reset(new TI::TMS9918(TI::TMS9918::TMS9918A));
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}
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void close_output() override {
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vdp_.reset();
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}
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Outputs::CRT::CRT *get_crt() override {
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return vdp_->get_crt();
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}
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Outputs::Speaker::Speaker *get_speaker() override {
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return &speaker_;
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}
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void run_for(const Cycles cycles) override {
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z80_.run_for(cycles);
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}
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float get_confidence() override {
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if(performed_unmapped_access_ || pc_zero_accesses_ > 1) return 0.0f;
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if(memory_slots_[1].handler) {
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return memory_slots_[1].handler->get_confidence();
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}
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return 0.5f;
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}
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void print_type() override {
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if(memory_slots_[1].handler) {
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memory_slots_[1].handler->print_type();
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}
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}
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void configure_as_target(const Analyser::Static::Target *target) override {
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auto *const msx_target = dynamic_cast<const Analyser::Static::MSX::Target *>(target);
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// Add a disk cartridge if any disks were supplied.
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if(msx_target->has_disk_drive) {
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map(2, 0, 0x4000, 0x2000);
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unmap(2, 0x6000, 0x2000);
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memory_slots_[2].set_handler(new DiskROM(memory_slots_[2].source));
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}
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// Insert the media.
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insert_media(target->media);
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// Type whatever has been requested.
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if(!msx_target->loading_command.empty()) {
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type_string(msx_target->loading_command);
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}
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}
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bool insert_media(const Analyser::Static::Media &media) override {
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if(!media.cartridges.empty()) {
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const auto &segment = media.cartridges.front()->get_segments().front();
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memory_slots_[1].source = segment.data;
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map(1, 0, static_cast<uint16_t>(segment.start_address), std::min(segment.data.size(), 65536 - segment.start_address));
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auto msx_cartridge = dynamic_cast<Analyser::Static::MSX::Cartridge *>(media.cartridges.front().get());
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if(msx_cartridge) {
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switch(msx_cartridge->type) {
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default: break;
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case Analyser::Static::MSX::Cartridge::Konami:
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memory_slots_[1].set_handler(new Cartridge::KonamiROMSlotHandler(*this, 1));
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break;
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case Analyser::Static::MSX::Cartridge::KonamiWithSCC:
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memory_slots_[1].set_handler(new Cartridge::KonamiWithSCCROMSlotHandler(*this, 1, scc_));
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break;
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case Analyser::Static::MSX::Cartridge::ASCII8kb:
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memory_slots_[1].set_handler(new Cartridge::ASCII8kbROMSlotHandler(*this, 1));
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break;
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case Analyser::Static::MSX::Cartridge::ASCII16kb:
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memory_slots_[1].set_handler(new Cartridge::ASCII16kbROMSlotHandler(*this, 1));
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break;
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}
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}
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}
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if(!media.tapes.empty()) {
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tape_player_.set_tape(media.tapes.front());
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}
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if(!media.disks.empty()) {
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DiskROM *disk_rom = dynamic_cast<DiskROM *>(memory_slots_[2].handler.get());
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int drive = 0;
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for(auto &disk : media.disks) {
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disk_rom->set_disk(disk, drive);
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drive++;
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if(drive == 2) break;
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}
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}
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set_use_fast_tape();
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return true;
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}
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void type_string(const std::string &string) override final {
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input_text_ += string;
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}
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// MARK: MSX::MemoryMap
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void map(int slot, std::size_t source_address, uint16_t destination_address, std::size_t length) override {
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assert(!(destination_address & 8191));
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assert(!(length & 8191));
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assert(static_cast<std::size_t>(destination_address) + length <= 65536);
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for(std::size_t c = 0; c < (length >> 13); ++c) {
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if(memory_slots_[slot].wrapping_strategy == ROMSlotHandler::WrappingStrategy::Repeat) source_address %= memory_slots_[slot].source.size();
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memory_slots_[slot].read_pointers[(destination_address >> 13) + c] =
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(source_address < memory_slots_[slot].source.size()) ? &memory_slots_[slot].source[source_address] : unpopulated_;
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source_address += 8192;
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}
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page_memory(paged_memory_);
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}
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void unmap(int slot, uint16_t destination_address, std::size_t length) override {
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assert(!(destination_address & 8191));
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assert(!(length & 8191));
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assert(static_cast<std::size_t>(destination_address) + length <= 65536);
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for(std::size_t c = 0; c < (length >> 13); ++c) {
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memory_slots_[slot].read_pointers[(destination_address >> 13) + c] = nullptr;
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}
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page_memory(paged_memory_);
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}
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// MARK: Ordinary paging.
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void page_memory(uint8_t value) {
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paged_memory_ = value;
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for(std::size_t c = 0; c < 8; c += 2) {
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read_pointers_[c] = memory_slots_[value & 3].read_pointers[c];
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write_pointers_[c] = memory_slots_[value & 3].write_pointers[c];
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read_pointers_[c+1] = memory_slots_[value & 3].read_pointers[c+1];
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write_pointers_[c+1] = memory_slots_[value & 3].write_pointers[c+1];
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value >>= 2;
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}
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}
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// MARK: Z80::BusHandler
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forceinline HalfCycles perform_machine_cycle(const CPU::Z80::PartialMachineCycle &cycle) {
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// Per the best information I currently have, the MSX inserts an extra cycle into each opcode read,
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// but otherwise runs without pause.
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const HalfCycles addition((cycle.operation == CPU::Z80::PartialMachineCycle::ReadOpcode) ? 2 : 0);
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const HalfCycles total_length = addition + cycle.length;
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time_since_vdp_update_ += total_length;
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time_since_ay_update_ += total_length;
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memory_slots_[0].cycles_since_update += total_length;
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memory_slots_[1].cycles_since_update += total_length;
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memory_slots_[2].cycles_since_update += total_length;
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memory_slots_[3].cycles_since_update += total_length;
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uint16_t address = cycle.address ? *cycle.address : 0x0000;
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switch(cycle.operation) {
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case CPU::Z80::PartialMachineCycle::ReadOpcode:
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if(use_fast_tape_) {
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if(address == 0x1a63) {
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// TAPION
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// Enable the tape motor.
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i8255_.set_register(0xab, 0x8);
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// Disable interrupts.
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z80_.set_value_of_register(CPU::Z80::Register::IFF1, 0);
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z80_.set_value_of_register(CPU::Z80::Register::IFF2, 0);
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// Use the parser to find a header, and if one is found then populate
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// LOWLIM and WINWID, and reset carry. Otherwise set carry.
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using Parser = Storage::Tape::MSX::Parser;
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std::unique_ptr<Parser::FileSpeed> new_speed = Parser::find_header(tape_player_);
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if(new_speed) {
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ram_[0xfca4] = new_speed->minimum_start_bit_duration;
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ram_[0xfca5] = new_speed->low_high_disrimination_duration;
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z80_.set_value_of_register(CPU::Z80::Register::Flags, 0);
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} else {
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z80_.set_value_of_register(CPU::Z80::Register::Flags, 1);
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}
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// RET.
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*cycle.value = 0xc9;
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break;
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}
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if(address == 0x1abc) {
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// TAPIN
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// Grab the current values of LOWLIM and WINWID.
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using Parser = Storage::Tape::MSX::Parser;
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Parser::FileSpeed tape_speed;
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tape_speed.minimum_start_bit_duration = ram_[0xfca4];
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tape_speed.low_high_disrimination_duration = ram_[0xfca5];
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// Ask the tape parser to grab a byte.
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int next_byte = Parser::get_byte(tape_speed, tape_player_);
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// If a byte was found, return it with carry unset. Otherwise set carry to
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// indicate error.
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if(next_byte >= 0) {
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z80_.set_value_of_register(CPU::Z80::Register::A, static_cast<uint16_t>(next_byte));
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z80_.set_value_of_register(CPU::Z80::Register::Flags, 0);
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} else {
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z80_.set_value_of_register(CPU::Z80::Register::Flags, 1);
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}
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// RET.
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*cycle.value = 0xc9;
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break;
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}
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}
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if(!address) {
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pc_zero_accesses_++;
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}
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if(read_pointers_[address >> 13] == unpopulated_) {
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performed_unmapped_access_ = true;
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}
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pc_address_ = address; // This is retained so as to be able to name the source of an access to cartridge handlers.
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case CPU::Z80::PartialMachineCycle::Read:
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if(read_pointers_[address >> 13]) {
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*cycle.value = read_pointers_[address >> 13][address & 8191];
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} else {
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int slot_hit = (paged_memory_ >> ((address >> 14) * 2)) & 3;
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memory_slots_[slot_hit].handler->run_for(memory_slots_[slot_hit].cycles_since_update.flush());
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*cycle.value = memory_slots_[slot_hit].handler->read(address);
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}
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break;
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case CPU::Z80::PartialMachineCycle::Write: {
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write_pointers_[address >> 13][address & 8191] = *cycle.value;
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int slot_hit = (paged_memory_ >> ((address >> 14) * 2)) & 3;
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if(memory_slots_[slot_hit].handler) {
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update_audio();
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memory_slots_[slot_hit].handler->run_for(memory_slots_[slot_hit].cycles_since_update.flush());
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memory_slots_[slot_hit].handler->write(address, *cycle.value, read_pointers_[pc_address_ >> 13] != memory_slots_[0].read_pointers[pc_address_ >> 13]);
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}
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} break;
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case CPU::Z80::PartialMachineCycle::Input:
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switch(address & 0xff) {
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case 0x98: case 0x99:
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vdp_->run_for(time_since_vdp_update_.flush());
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*cycle.value = vdp_->get_register(address);
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z80_.set_interrupt_line(vdp_->get_interrupt_line());
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time_until_interrupt_ = vdp_->get_time_until_interrupt();
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break;
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case 0xa2:
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update_audio();
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ay_.set_control_lines(static_cast<GI::AY38910::ControlLines>(GI::AY38910::BC2 | GI::AY38910::BC1));
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*cycle.value = ay_.get_data_output();
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ay_.set_control_lines(static_cast<GI::AY38910::ControlLines>(0));
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break;
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case 0xa8: case 0xa9:
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case 0xaa: case 0xab:
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*cycle.value = i8255_.get_register(address);
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break;
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default:
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*cycle.value = 0xff;
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break;
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}
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break;
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case CPU::Z80::PartialMachineCycle::Output: {
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const int port = address & 0xff;
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switch(port) {
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case 0x98: case 0x99:
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vdp_->run_for(time_since_vdp_update_.flush());
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vdp_->set_register(address, *cycle.value);
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z80_.set_interrupt_line(vdp_->get_interrupt_line());
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time_until_interrupt_ = vdp_->get_time_until_interrupt();
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break;
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case 0xa0: case 0xa1:
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update_audio();
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ay_.set_control_lines(static_cast<GI::AY38910::ControlLines>(GI::AY38910::BDIR | GI::AY38910::BC2 | ((port == 0xa0) ? GI::AY38910::BC1 : 0)));
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ay_.set_data_input(*cycle.value);
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ay_.set_control_lines(static_cast<GI::AY38910::ControlLines>(0));
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break;
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case 0xa8: case 0xa9:
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case 0xaa: case 0xab:
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i8255_.set_register(address, *cycle.value);
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break;
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case 0xfc: case 0xfd: case 0xfe: case 0xff:
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// printf("RAM banking %02x: %02x\n", port, *cycle.value);
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break;
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}
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} break;
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case CPU::Z80::PartialMachineCycle::Interrupt:
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*cycle.value = 0xff;
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// Take this as a convenient moment to jump into the keyboard buffer, if desired.
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if(!input_text_.empty()) {
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// TODO: is it safe to assume these addresses?
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const int buffer_start = 0xfbf0;
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const int buffer_end = 0xfb18;
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int read_address = ram_[0xf3fa] | (ram_[0xf3fb] << 8);
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int write_address = ram_[0xf3f8] | (ram_[0xf3f9] << 8);
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const int buffer_size = buffer_end - buffer_start;
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int available_space = write_address + buffer_size - read_address - 1;
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const std::size_t characters_to_write = std::min(static_cast<std::size_t>(available_space), input_text_.size());
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write_address -= buffer_start;
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for(std::size_t c = 0; c < characters_to_write; ++c) {
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char character = input_text_[c];
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ram_[write_address + buffer_start] = static_cast<uint8_t>(character);
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write_address = (write_address + 1) % buffer_size;
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}
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write_address += buffer_start;
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input_text_.erase(input_text_.begin(), input_text_.begin() + static_cast<std::string::difference_type>(characters_to_write));
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ram_[0xf3f8] = static_cast<uint8_t>(write_address);
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ram_[0xf3f9] = static_cast<uint8_t>(write_address >> 8);
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}
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break;
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default: break;
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}
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if(!tape_player_is_sleeping_)
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tape_player_.run_for(cycle.length.as_int());
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if(time_until_interrupt_ > 0) {
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time_until_interrupt_ -= total_length;
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if(time_until_interrupt_ <= HalfCycles(0)) {
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z80_.set_interrupt_line(true, time_until_interrupt_);
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}
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}
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return addition;
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}
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void flush() {
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vdp_->run_for(time_since_vdp_update_.flush());
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update_audio();
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audio_queue_.perform();
|
||
}
|
||
|
||
// Obtains the system ROMs.
|
||
bool set_rom_fetcher(const ROMMachine::ROMFetcher &roms_with_names) override {
|
||
auto roms = roms_with_names(
|
||
"MSX",
|
||
{
|
||
"msx.rom",
|
||
"disk.rom"
|
||
});
|
||
|
||
if(!roms[0] || !roms[1]) return false;
|
||
|
||
memory_slots_[0].source = std::move(*roms[0]);
|
||
memory_slots_[0].source.resize(32768);
|
||
|
||
memory_slots_[2].source = std::move(*roms[1]);
|
||
memory_slots_[2].source.resize(16384);
|
||
|
||
for(size_t c = 0; c < 8; ++c) {
|
||
for(size_t slot = 0; slot < 3; ++slot) {
|
||
memory_slots_[slot].read_pointers[c] = unpopulated_;
|
||
memory_slots_[slot].write_pointers[c] = scratch_;
|
||
}
|
||
|
||
memory_slots_[3].read_pointers[c] =
|
||
memory_slots_[3].write_pointers[c] = &ram_[c * 8192];
|
||
}
|
||
|
||
map(0, 0, 0, 32768);
|
||
page_memory(0);
|
||
|
||
return true;
|
||
}
|
||
|
||
void set_keyboard_line(int line) {
|
||
selected_key_line_ = line;
|
||
}
|
||
|
||
uint8_t read_keyboard() {
|
||
return key_states_[selected_key_line_];
|
||
}
|
||
|
||
void clear_all_keys() override {
|
||
std::memset(key_states_, 0xff, sizeof(key_states_));
|
||
}
|
||
|
||
void set_key_state(uint16_t key, bool is_pressed) override {
|
||
int mask = 1 << (key & 7);
|
||
int line = key >> 4;
|
||
if(is_pressed) key_states_[line] &= ~mask; else key_states_[line] |= mask;
|
||
}
|
||
|
||
KeyboardMapper *get_keyboard_mapper() override {
|
||
return &keyboard_mapper_;
|
||
}
|
||
|
||
// MARK: - Configuration options.
|
||
std::vector<std::unique_ptr<Configurable::Option>> get_options() override {
|
||
return MSX::get_options();
|
||
}
|
||
|
||
void set_selections(const Configurable::SelectionSet &selections_by_option) override {
|
||
bool quickload;
|
||
if(Configurable::get_quick_load_tape(selections_by_option, quickload)) {
|
||
allow_fast_tape_ = quickload;
|
||
set_use_fast_tape();
|
||
}
|
||
|
||
Configurable::Display display;
|
||
if(Configurable::get_display(selections_by_option, display)) {
|
||
set_video_signal_configurable(display);
|
||
}
|
||
}
|
||
|
||
Configurable::SelectionSet get_accurate_selections() override {
|
||
Configurable::SelectionSet selection_set;
|
||
Configurable::append_quick_load_tape_selection(selection_set, false);
|
||
Configurable::append_display_selection(selection_set, Configurable::Display::Composite);
|
||
return selection_set;
|
||
}
|
||
|
||
Configurable::SelectionSet get_user_friendly_selections() override {
|
||
Configurable::SelectionSet selection_set;
|
||
Configurable::append_quick_load_tape_selection(selection_set, true);
|
||
Configurable::append_display_selection(selection_set, Configurable::Display::RGB);
|
||
return selection_set;
|
||
}
|
||
|
||
// MARK: - Sleeper
|
||
void set_component_is_sleeping(Sleeper *component, bool is_sleeping) override {
|
||
tape_player_is_sleeping_ = tape_player_.is_sleeping();
|
||
set_use_fast_tape();
|
||
}
|
||
|
||
private:
|
||
void update_audio() {
|
||
speaker_.run_for(audio_queue_, time_since_ay_update_.divide_cycles(Cycles(2)));
|
||
}
|
||
|
||
class i8255PortHandler: public Intel::i8255::PortHandler {
|
||
public:
|
||
i8255PortHandler(ConcreteMachine &machine, Audio::Toggle &audio_toggle, Storage::Tape::BinaryTapePlayer &tape_player) :
|
||
machine_(machine), audio_toggle_(audio_toggle), tape_player_(tape_player) {}
|
||
|
||
void set_value(int port, uint8_t value) {
|
||
switch(port) {
|
||
case 0: machine_.page_memory(value); break;
|
||
case 2: {
|
||
// TODO:
|
||
// b6 caps lock LED
|
||
// b5 audio output
|
||
|
||
// b4: cassette motor relay
|
||
tape_player_.set_motor_control(!(value & 0x10));
|
||
|
||
// b7: keyboard click
|
||
bool new_audio_level = !!(value & 0x80);
|
||
if(audio_toggle_.get_output() != new_audio_level) {
|
||
machine_.update_audio();
|
||
audio_toggle_.set_output(new_audio_level);
|
||
}
|
||
|
||
// b0–b3: keyboard line
|
||
machine_.set_keyboard_line(value & 0xf);
|
||
} break;
|
||
default: printf("What what what what?\n"); break;
|
||
}
|
||
}
|
||
|
||
uint8_t get_value(int port) {
|
||
if(port == 1) {
|
||
return machine_.read_keyboard();
|
||
} else printf("What what?\n");
|
||
return 0xff;
|
||
}
|
||
|
||
private:
|
||
ConcreteMachine &machine_;
|
||
Audio::Toggle &audio_toggle_;
|
||
Storage::Tape::BinaryTapePlayer &tape_player_;
|
||
};
|
||
|
||
CPU::Z80::Processor<ConcreteMachine, false, false> z80_;
|
||
std::unique_ptr<TI::TMS9918> vdp_;
|
||
Intel::i8255::i8255<i8255PortHandler> i8255_;
|
||
|
||
Concurrency::DeferringAsyncTaskQueue audio_queue_;
|
||
GI::AY38910::AY38910 ay_;
|
||
Audio::Toggle audio_toggle_;
|
||
Konami::SCC scc_;
|
||
Outputs::Speaker::CompoundSource<GI::AY38910::AY38910, Audio::Toggle, Konami::SCC> mixer_;
|
||
Outputs::Speaker::LowpassSpeaker<Outputs::Speaker::CompoundSource<GI::AY38910::AY38910, Audio::Toggle, Konami::SCC>> speaker_;
|
||
|
||
Storage::Tape::BinaryTapePlayer tape_player_;
|
||
bool tape_player_is_sleeping_ = false;
|
||
bool allow_fast_tape_ = false;
|
||
bool use_fast_tape_ = false;
|
||
void set_use_fast_tape() {
|
||
use_fast_tape_ = !tape_player_is_sleeping_ && allow_fast_tape_ && tape_player_.has_tape();
|
||
}
|
||
|
||
i8255PortHandler i8255_port_handler_;
|
||
AYPortHandler ay_port_handler_;
|
||
|
||
uint8_t paged_memory_ = 0;
|
||
uint8_t *read_pointers_[8];
|
||
uint8_t *write_pointers_[8];
|
||
|
||
struct MemorySlots {
|
||
uint8_t *read_pointers[8];
|
||
uint8_t *write_pointers[8];
|
||
|
||
void set_handler(ROMSlotHandler *slot_handler) {
|
||
handler.reset(slot_handler);
|
||
wrapping_strategy = handler->wrapping_strategy();
|
||
}
|
||
|
||
std::unique_ptr<ROMSlotHandler> handler;
|
||
std::vector<uint8_t> source;
|
||
HalfCycles cycles_since_update;
|
||
ROMSlotHandler::WrappingStrategy wrapping_strategy = ROMSlotHandler::WrappingStrategy::Repeat;
|
||
} memory_slots_[4];
|
||
|
||
uint8_t ram_[65536];
|
||
uint8_t scratch_[8192];
|
||
uint8_t unpopulated_[8192];
|
||
|
||
HalfCycles time_since_vdp_update_;
|
||
HalfCycles time_since_ay_update_;
|
||
HalfCycles time_until_interrupt_;
|
||
|
||
uint8_t key_states_[16];
|
||
int selected_key_line_ = 0;
|
||
std::string input_text_;
|
||
|
||
MSX::KeyboardMapper keyboard_mapper_;
|
||
|
||
int pc_zero_accesses_ = 0;
|
||
bool performed_unmapped_access_ = false;
|
||
uint16_t pc_address_;
|
||
};
|
||
|
||
}
|
||
|
||
using namespace MSX;
|
||
|
||
Machine *Machine::MSX() {
|
||
return new ConcreteMachine;
|
||
}
|
||
|
||
Machine::~Machine() {}
|