6502/CLK
1
0
Fork 0
mirror of https://github.com/TomHarte/CLK.git synced 2024-06-29 15:29:36 +00:00
Code Issues Projects Releases Wiki Activity
b40211d2c0
CLK/Machines/Oric/Oric.cpp

654 lines
20 KiB
C++
Raw Blame History

//
// Oric.cpp
// Clock Signal
//
// Created by Thomas Harte on 11/10/2016.
// Copyright 2016 Thomas Harte. All rights reserved.
//
#include "Oric.hpp"
#include "Keyboard.hpp"
#include "Microdisc.hpp"
#include "Video.hpp"
#include "../../Activity/Source.hpp"
#include "../MediaTarget.hpp"
#include "../CRTMachine.hpp"
#include "../KeyboardMachine.hpp"
#include "../Utility/MemoryFuzzer.hpp"
#include "../Utility/StringSerialiser.hpp"
#include "../../Processors/6502/6502.hpp"
#include "../../Components/6522/6522.hpp"
#include "../../Components/AY38910/AY38910.hpp"
#include "../../Components/DiskII/DiskII.hpp"
#include "../../Storage/Tape/Tape.hpp"
#include "../../Storage/Tape/Parsers/Oric.hpp"
#include "../../ClockReceiver/ForceInline.hpp"
#include "../../Configurable/StandardOptions.hpp"
#include "../../Outputs/Speaker/Implementation/LowpassSpeaker.hpp"
#include "../../Analyser/Static/Oric/Target.hpp"
#include <cstdint>
#include <memory>
#include <vector>
namespace Oric {
enum ROM {
BASIC10 = 0, BASIC11, Microdisc, Colour
};
std::vector<std::unique_ptr<Configurable::Option>> get_options() {
return Configurable::standard_options(
static_cast<Configurable::StandardOptions>(Configurable::DisplayRGB | Configurable::DisplayComposite | Configurable::QuickLoadTape)
);
}
/*!
Models the Oric's keyboard: eight key rows, containing a bitfield of keys set.
Active line is selected through a port on the Oric's VIA, and a column mask is
selected via a port on the AY, returning a single Boolean representation of the
logical OR of every key selected by the column mask on the active row.
*/
class Keyboard {
public:
Keyboard() {
clear_all_keys();
}
/// Sets whether @c key is or is not pressed, per @c is_pressed.
void set_key_state(uint16_t key, bool is_pressed) {
uint8_t mask = key & 0xff;
int line = key >> 8;
if(is_pressed) rows_[line] |= mask;
else rows_[line] &= ~mask;
}
/// Sets all keys as unpressed.
void clear_all_keys() {
memset(rows_, 0, sizeof(rows_));
}
/// Selects the active row.
void set_active_row(uint8_t row) {
row_ = row & 7;
}
/// Queries the keys on the active row specified by @c mask.
bool query_column(uint8_t column_mask) {
return !!(rows_[row_] & column_mask);
}
private:
uint8_t row_ = 0;
uint8_t rows_[8];
};
/*!
Provide's the Oric's tape player: a standard binary-sampled tape which also holds
an instance of the Oric tape parser, to provide fast-tape loading.
*/
class TapePlayer: public Storage::Tape::BinaryTapePlayer {
public:
TapePlayer() : Storage::Tape::BinaryTapePlayer(1000000) {}
/*!
Parses the incoming tape event stream to obtain the next stored byte.
@param use_fast_encoding If set to @c true , inspects the tape as though it
is encoded in the Oric's fast-loading scheme. Otherwise looks for a slow-encoded byte.
@returns The next byte from the tape.
*/
uint8_t get_next_byte(bool use_fast_encoding) {
return static_cast<uint8_t>(parser_.get_next_byte(get_tape(), use_fast_encoding));
}
private:
Storage::Tape::Oric::Parser parser_;
};
/*!
Implements the Oric's VIA's port handler. On the Oric the VIA's ports connect
to the AY, the tape's motor control signal and the keyboard.
*/
class VIAPortHandler: public MOS::MOS6522::IRQDelegatePortHandler {
public:
VIAPortHandler(Concurrency::DeferringAsyncTaskQueue &audio_queue, GI::AY38910::AY38910 &ay8910, Outputs::Speaker::LowpassSpeaker<GI::AY38910::AY38910> &speaker, TapePlayer &tape_player, Keyboard &keyboard) :
audio_queue_(audio_queue), ay8910_(ay8910), speaker_(speaker), tape_player_(tape_player), keyboard_(keyboard) {}
/*!
Reponds to the 6522's control line output change signal; on an Oric A2 is connected to
the AY's BDIR, and B2 is connected to the AY's A2.
*/
void set_control_line_output(MOS::MOS6522::Port port, MOS::MOS6522::Line line, bool value) {
if(line) {
if(port) ay_bdir_ = value; else ay_bc1_ = value;
update_ay();
ay8910_.set_control_lines( (GI::AY38910::ControlLines)((ay_bdir_ ? GI::AY38910::BDIR : 0) | (ay_bc1_ ? GI::AY38910::BC1 : 0) | GI::AY38910::BC2));
}
}
/*!
Reponds to changes in the 6522's port output. On an Oric port B sets the tape motor control
and the keyboard's active row. Port A is connected to the AY's data bus.
*/
void set_port_output(MOS::MOS6522::Port port, uint8_t value, uint8_t direction_mask) {
if(port) {
keyboard_.set_active_row(value);
tape_player_.set_motor_control(value & 0x40);
} else {
update_ay();
ay8910_.set_data_input(value);
}
}
/*!
Provides input data for the 6522. Port B reads the keyboard, and port A reads from the AY.
*/
uint8_t get_port_input(MOS::MOS6522::Port port) {
if(port) {
uint8_t column = ay8910_.get_port_output(false) ^ 0xff;
return keyboard_.query_column(column) ? 0x08 : 0x00;
} else {
return ay8910_.get_data_output();
}
}
/*!
Advances time. This class manages the AY's concept of time to permit updating-on-demand.
*/
inline void run_for(const Cycles cycles) {
cycles_since_ay_update_ += cycles;
}
/// Flushes any queued behaviour (which, specifically, means on the AY).
void flush() {
update_ay();
audio_queue_.perform();
}
private:
void update_ay() {
speaker_.run_for(audio_queue_, cycles_since_ay_update_.flush());
}
bool ay_bdir_ = false;
bool ay_bc1_ = false;
Cycles cycles_since_ay_update_;
Concurrency::DeferringAsyncTaskQueue &audio_queue_;
GI::AY38910::AY38910 &ay8910_;
Outputs::Speaker::LowpassSpeaker<GI::AY38910::AY38910> &speaker_;
TapePlayer &tape_player_;
Keyboard &keyboard_;
};
template <Analyser::Static::Oric::Target::DiskInterface disk_interface> class ConcreteMachine:
public CRTMachine::Machine,
public MediaTarget::Machine,
public KeyboardMachine::MappedMachine,
public Configurable::Device,
public CPU::MOS6502::BusHandler,
public MOS::MOS6522::IRQDelegatePortHandler::Delegate,
public Utility::TypeRecipient,
public Storage::Tape::BinaryTapePlayer::Delegate,
public Microdisc::Delegate,
public ClockingHint::Observer,
public Activity::Source,
public Machine {
public:
ConcreteMachine(const Analyser::Static::Oric::Target &target, const ROMMachine::ROMFetcher &rom_fetcher) :
m6502_(*this),
ay8910_(audio_queue_),
speaker_(ay8910_),
via_port_handler_(audio_queue_, ay8910_, speaker_, tape_player_, keyboard_),
via_(via_port_handler_),
diskii_(2000000) {
set_clock_rate(1000000);
via_port_handler_.set_interrupt_delegate(this);
tape_player_.set_delegate(this);
Memory::Fuzz(ram_, sizeof(ram_));
if(disk_interface == Analyser::Static::Oric::Target::DiskInterface::Pravetz) {
diskii_.set_clocking_hint_observer(this);
}
std::vector<std::string> rom_names = {"colour.rom"};
switch(target.rom) {
case Analyser::Static::Oric::Target::ROM::BASIC10: rom_names.push_back("basic10.rom"); break;
case Analyser::Static::Oric::Target::ROM::BASIC11: rom_names.push_back("basic11.rom"); break;
case Analyser::Static::Oric::Target::ROM::Pravetz: rom_names.push_back("pravetz.rom"); break;
}
switch(disk_interface) {
default: break;
case Analyser::Static::Oric::Target::DiskInterface::Microdisc: rom_names.push_back("microdisc.rom"); break;
case Analyser::Static::Oric::Target::DiskInterface::Pravetz: rom_names.push_back("8dos.rom"); break;
}
const auto roms = rom_fetcher("Oric", rom_names);
for(std::size_t index = 0; index < roms.size(); ++index) {
if(!roms[index]) {
throw ROMMachine::Error::MissingROMs;
}
}
colour_rom_ = std::move(*roms[0]);
rom_ = std::move(*roms[1]);
switch(disk_interface) {
default: break;
case Analyser::Static::Oric::Target::DiskInterface::Microdisc:
microdisc_rom_ = std::move(*roms[2]);
microdisc_rom_.resize(8192);
break;
case Analyser::Static::Oric::Target::DiskInterface::Pravetz: {
pravetz_rom_ = std::move(*roms[2]);
pravetz_rom_.resize(512);
auto state_machine_rom = rom_fetcher("DiskII", {"state-machine-16.rom"});
if(!state_machine_rom[0]) {
throw ROMMachine::Error::MissingROMs;
}
diskii_.set_state_machine(*state_machine_rom[0]);
} break;
}
colour_rom_.resize(128);
rom_.resize(16384);
paged_rom_ = rom_.data();
switch(target.disk_interface) {
default: break;
case Analyser::Static::Oric::Target::DiskInterface::Microdisc:
microdisc_did_change_paging_flags(&microdisc_);
microdisc_.set_delegate(this);
break;
}
if(!target.loading_command.empty()) {
type_string(target.loading_command);
}
switch(target.rom) {
case Analyser::Static::Oric::Target::ROM::BASIC10:
tape_get_byte_address_ = 0xe630;
tape_speed_address_ = 0x67;
break;
case Analyser::Static::Oric::Target::ROM::BASIC11:
case Analyser::Static::Oric::Target::ROM::Pravetz:
tape_get_byte_address_ = 0xe6c9;
tape_speed_address_ = 0x024d;
break;
}
insert_media(target.media);
}
~ConcreteMachine() {
audio_queue_.flush();
}
void set_key_state(uint16_t key, bool is_pressed) override final {
if(key == KeyNMI) {
m6502_.set_nmi_line(is_pressed);
} else {
keyboard_.set_key_state(key, is_pressed);
}
}
void clear_all_keys() override final {
keyboard_.clear_all_keys();
}
void set_use_fast_tape_hack(bool activate) {
use_fast_tape_hack_ = activate;
}
bool insert_media(const Analyser::Static::Media &media) override final {
bool inserted = false;
if(!media.tapes.empty()) {
tape_player_.set_tape(media.tapes.front());
inserted = true;
}
if(!media.disks.empty()) {
switch(disk_interface) {
case Analyser::Static::Oric::Target::DiskInterface::Microdisc: {
inserted = true;
size_t drive_index = 0;
for(auto &disk : media.disks) {
if(drive_index < 4) microdisc_.set_disk(disk, drive_index);
++drive_index;
}
} break;
case Analyser::Static::Oric::Target::DiskInterface::Pravetz: {
inserted = true;
int drive_index = 0;
for(auto &disk : media.disks) {
if(drive_index < 2) diskii_.set_disk(disk, drive_index);
++drive_index;
}
} break;
default: break;
}
}
return inserted;
}
// to satisfy CPU::MOS6502::BusHandler
forceinline Cycles perform_bus_operation(CPU::MOS6502::BusOperation operation, uint16_t address, uint8_t *value) {
if(address > ram_top_) {
if(isReadOperation(operation)) *value = paged_rom_[address - ram_top_ - 1];
// 024D = 0 => fast; otherwise slow
// E6C9 = read byte: return byte in A
if( address == tape_get_byte_address_ &&
paged_rom_ == rom_.data() &&
use_fast_tape_hack_ &&
operation == CPU::MOS6502::BusOperation::ReadOpcode &&
tape_player_.has_tape() &&
!tape_player_.get_tape()->is_at_end()) {
uint8_t next_byte = tape_player_.get_next_byte(!ram_[tape_speed_address_]);
m6502_.set_value_of_register(CPU::MOS6502::A, next_byte);
m6502_.set_value_of_register(CPU::MOS6502::Flags, next_byte ? 0 : CPU::MOS6502::Flag::Zero);
*value = 0x60; // i.e. RTS
}
} else {
if((address & 0xff00) == 0x0300) {
if(address < 0x0310 || (disk_interface == Analyser::Static::Oric::Target::DiskInterface::None)) {
if(isReadOperation(operation)) *value = via_.get_register(address);
else via_.set_register(address, *value);
} else {
switch(disk_interface) {
default: break;
case Analyser::Static::Oric::Target::DiskInterface::Microdisc:
switch(address) {
case 0x0310: case 0x0311: case 0x0312: case 0x0313:
if(isReadOperation(operation)) *value = microdisc_.get_register(address);
else microdisc_.set_register(address, *value);
break;
case 0x314: case 0x315: case 0x316: case 0x317:
if(isReadOperation(operation)) *value = microdisc_.get_interrupt_request_register();
else microdisc_.set_control_register(*value);
break;
case 0x318: case 0x319: case 0x31a: case 0x31b:
if(isReadOperation(operation)) *value = microdisc_.get_data_request_register();
break;
}
break;
case Analyser::Static::Oric::Target::DiskInterface::Pravetz:
if(address >= 0x0320) {
if(isReadOperation(operation)) *value = pravetz_rom_[pravetz_rom_base_pointer_ + (address & 0xff)];
else {
switch(address) {
case 0x380: case 0x381: case 0x382: case 0x383:
ram_top_ = (address&1) ? basic_invisible_ram_top_ : basic_visible_ram_top_;
pravetz_rom_base_pointer_ = (address&2) ? 0x100 : 0x000;
break;
}
}
} else {
flush_diskii();
const int disk_value = diskii_.read_address(address);
if(isReadOperation(operation) && disk_value != diskii_.DidNotLoad) *value = static_cast<uint8_t>(disk_value);
}
break;
}
}
} else {
if(isReadOperation(operation))
*value = ram_[address];
else {
if(address >= 0x9800 && address <= 0xc000) update_video();
ram_[address] = *value;
}
}
}
// $02df is where the Oric ROMs; all of them, including BASIC 1.0, 1.1 and the Pravetz; have the
// IRQ routine store an incoming keystroke in order for reading to occur later. By capturing the
// read rather than the decode and write: (i) nothing is lost while BASIC is parsing; and
// (ii) keyboard input is much more rapid.
if(string_serialiser_ && address == 0x02df && operation == CPU::MOS6502::BusOperation::Read) {
*value = string_serialiser_->head() | 0x80;
if(!string_serialiser_->advance()) string_serialiser_.reset();
}
via_.run_for(Cycles(1));
via_port_handler_.run_for(Cycles(1));
tape_player_.run_for(Cycles(1));
switch(disk_interface) {
default: break;
case Analyser::Static::Oric::Target::DiskInterface::Microdisc:
microdisc_.run_for(Cycles(8));
break;
case Analyser::Static::Oric::Target::DiskInterface::Pravetz:
if(diskii_clocking_preference_ == ClockingHint::Preference::RealTime) {
diskii_.set_data_input(*value);
diskii_.run_for(Cycles(2));
} else {
cycles_since_diskii_update_ += Cycles(2);
}
break;
}
cycles_since_video_update_++;
return Cycles(1);
}
forceinline void flush() {
update_video();
via_port_handler_.flush();
flush_diskii();
}
// to satisfy CRTMachine::Machine
void setup_output(Outputs::Display::ScanTarget *scan_target) override final {
speaker_.set_input_rate(1000000.0f);
video_output_.reset(new VideoOutput(ram_));
if(!colour_rom_.empty()) video_output_->set_colour_rom(colour_rom_);
set_video_signal(Outputs::Display::VideoSignal::RGB);
}
// void close_output() override final {
// video_output_.reset();
// }
//
// Outputs::CRT::CRT *get_crt() override final {
// return video_output_->get_crt();
// }
Outputs::Speaker::Speaker *get_speaker() override final {
return &speaker_;
}
void run_for(const Cycles cycles) override final {
m6502_.run_for(cycles);
}
// to satisfy MOS::MOS6522IRQDelegate::Delegate
void mos6522_did_change_interrupt_status(void *mos6522) override final {
set_interrupt_line();
}
// to satisfy Storage::Tape::BinaryTapePlayer::Delegate
void tape_did_change_input(Storage::Tape::BinaryTapePlayer *tape_player) override final {
// set CB1
via_.set_control_line_input(MOS::MOS6522::Port::B, MOS::MOS6522::Line::One, !tape_player->get_input());
}
// for Utility::TypeRecipient::Delegate
void type_string(const std::string &string) override final {
string_serialiser_.reset(new Utility::StringSerialiser(string, true));
}
// for Microdisc::Delegate
void microdisc_did_change_paging_flags(class Microdisc *microdisc) override final {
int flags = microdisc->get_paging_flags();
if(!(flags&Microdisc::PagingFlags::BASICDisable)) {
ram_top_ = basic_visible_ram_top_;
paged_rom_ = rom_.data();
} else {
if(flags&Microdisc::PagingFlags::MicrodiscDisable) {
ram_top_ = basic_invisible_ram_top_;
} else {
ram_top_ = 0xdfff;
paged_rom_ = microdisc_rom_.data();
}
}
}
void wd1770_did_change_output(WD::WD1770 *wd1770) override final {
set_interrupt_line();
}
KeyboardMapper *get_keyboard_mapper() override {
return &keyboard_mapper_;
}
// MARK: - Configuration options.
std::vector<std::unique_ptr<Configurable::Option>> get_options() override {
return Oric::get_options();
}
void set_selections(const Configurable::SelectionSet &selections_by_option) override {
bool quickload;
if(Configurable::get_quick_load_tape(selections_by_option, quickload)) {
set_use_fast_tape_hack(quickload);
}
Configurable::Display display;
if(Configurable::get_display(selections_by_option, display)) {
set_video_signal_configurable(display);
}
}
void set_video_signal(Outputs::Display::VideoSignal video_signal) override {
video_output_->set_video_signal(video_signal);
}
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;
}
void set_activity_observer(Activity::Observer *observer) override {
switch(disk_interface) {
default: break;
case Analyser::Static::Oric::Target::DiskInterface::Microdisc:
microdisc_.set_activity_observer(observer);
break;
case Analyser::Static::Oric::Target::DiskInterface::Pravetz:
diskii_.set_activity_observer(observer);
break;
}
}
void set_component_prefers_clocking(ClockingHint::Source *component, ClockingHint::Preference preference) override final {
diskii_clocking_preference_ = diskii_.preferred_clocking();
}
private:
const uint16_t basic_invisible_ram_top_ = 0xffff;
const uint16_t basic_visible_ram_top_ = 0xbfff;
CPU::MOS6502::Processor<CPU::MOS6502::Personality::P6502, ConcreteMachine, false> m6502_;
// RAM and ROM
std::vector<uint8_t> rom_, microdisc_rom_, colour_rom_;
uint8_t ram_[65536];
Cycles cycles_since_video_update_;
inline void update_video() {
video_output_->run_for(cycles_since_video_update_.flush());
}
// ROM bookkeeping
uint16_t tape_get_byte_address_ = 0, tape_speed_address_ = 0;
int keyboard_read_count_ = 0;
// Outputs
std::unique_ptr<VideoOutput> video_output_;
Concurrency::DeferringAsyncTaskQueue audio_queue_;
GI::AY38910::AY38910 ay8910_;
Outputs::Speaker::LowpassSpeaker<GI::AY38910::AY38910> speaker_;
// Inputs
Oric::KeyboardMapper keyboard_mapper_;
// The tape
TapePlayer tape_player_;
bool use_fast_tape_hack_ = false;
VIAPortHandler via_port_handler_;
MOS::MOS6522::MOS6522<VIAPortHandler> via_;
Keyboard keyboard_;
// the Microdisc, if in use
class Microdisc microdisc_;
// the Pravetz/Disk II, if in use
Apple::DiskII diskii_;
Cycles cycles_since_diskii_update_;
void flush_diskii() {
diskii_.run_for(cycles_since_diskii_update_.flush());
}
std::vector<uint8_t> pravetz_rom_;
std::size_t pravetz_rom_base_pointer_ = 0;
ClockingHint::Preference diskii_clocking_preference_ = ClockingHint::Preference::RealTime;
// Overlay RAM
uint16_t ram_top_ = basic_visible_ram_top_;
uint8_t *paged_rom_ = nullptr;
// Helper to discern current IRQ state
inline void set_interrupt_line() {
bool irq_line = via_.get_interrupt_line();
if(disk_interface == Analyser::Static::Oric::Target::DiskInterface::Microdisc)
irq_line |= microdisc_.get_interrupt_request_line();
m6502_.set_irq_line(irq_line);
}
// MARK - typing
std::unique_ptr<Utility::StringSerialiser> string_serialiser_;
};
}
using namespace Oric;
Machine *Machine::Oric(const Analyser::Static::Target *target_hint, const ROMMachine::ROMFetcher &rom_fetcher) {
auto *const oric_target = dynamic_cast<const Analyser::Static::Oric::Target *>(target_hint);
using DiskInterface = Analyser::Static::Oric::Target::DiskInterface;
switch(oric_target->disk_interface) {
default: return new ConcreteMachine<DiskInterface::None>(*oric_target, rom_fetcher);
case DiskInterface::Microdisc: return new ConcreteMachine<DiskInterface::Microdisc>(*oric_target, rom_fetcher);
case DiskInterface::Pravetz: return new ConcreteMachine<DiskInterface::Pravetz>(*oric_target, rom_fetcher);
}
}
Machine::~Machine() {}
Reference in New Issue View Git Blame Copy Permalink