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CLK/Machines/AppleII/AppleII.cpp

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//
// AppleII.cpp
// Clock Signal
//
// Created by Thomas Harte on 14/04/2018.
// Copyright 2018 Thomas Harte. All rights reserved.
//
#include "AppleII.hpp"
#include "../../Activity/Source.hpp"
#include "../MediaTarget.hpp"
#include "../CRTMachine.hpp"
#include "../JoystickMachine.hpp"
#include "../KeyboardMachine.hpp"
#include "../Utility/MemoryFuzzer.hpp"
#include "../Utility/StringSerialiser.hpp"
#include "../../Processors/6502/6502.hpp"
#include "../../Components/AudioToggle/AudioToggle.hpp"
#include "../../Outputs/Speaker/Implementation/LowpassSpeaker.hpp"
#include "Card.hpp"
#include "DiskIICard.hpp"
#include "Video.hpp"
#include "../../Analyser/Static/AppleII/Target.hpp"
#include "../../ClockReceiver/ForceInline.hpp"
#include "../../Configurable/Configurable.hpp"
#include "../../Storage/Disk/Track/TrackSerialiser.hpp"
#include "../../Storage/Disk/Encodings/AppleGCR/SegmentParser.hpp"
#include <algorithm>
#include <array>
#include <memory>
std::vector<std::unique_ptr<Configurable::Option>> AppleII::get_options() {
std::vector<std::unique_ptr<Configurable::Option>> options;
options.emplace_back(new Configurable::BooleanOption("Accelerate DOS 3.3", "quickload"));
return options;
}
namespace {
class ConcreteMachine:
public CRTMachine::Machine,
public MediaTarget::Machine,
public KeyboardMachine::Machine,
public Configurable::Device,
public CPU::MOS6502::BusHandler,
public Inputs::Keyboard,
public AppleII::Machine,
public Activity::Source,
public JoystickMachine::Machine,
public AppleII::Card::Delegate {
private:
struct VideoBusHandler : public AppleII::Video::BusHandler {
public:
VideoBusHandler(uint8_t *ram) : ram_(ram) {}
uint8_t perform_read(uint16_t address) {
return ram_[address];
}
private:
uint8_t *ram_;
};
CPU::MOS6502::Processor<ConcreteMachine, false> m6502_;
VideoBusHandler video_bus_handler_;
std::unique_ptr<AppleII::Video::Video<VideoBusHandler>> video_;
int cycles_into_current_line_ = 0;
Cycles cycles_since_video_update_;
void update_video() {
video_->run_for(cycles_since_video_update_.flush());
}
static const int audio_divider = 8;
void update_audio() {
speaker_.run_for(audio_queue_, cycles_since_audio_update_.divide(Cycles(audio_divider)));
}
void update_just_in_time_cards() {
for(const auto &card : just_in_time_cards_) {
card->run_for(cycles_since_card_update_, stretched_cycles_since_card_update_);
}
cycles_since_card_update_ = 0;
stretched_cycles_since_card_update_ = 0;
}
uint8_t ram_[65536], aux_ram_[65536];
std::vector<uint8_t> rom_;
std::vector<uint8_t> character_rom_;
uint8_t keyboard_input_ = 0x00;
Concurrency::DeferringAsyncTaskQueue audio_queue_;
Audio::Toggle audio_toggle_;
Outputs::Speaker::LowpassSpeaker<Audio::Toggle> speaker_;
Cycles cycles_since_audio_update_;
// MARK: - Cards
std::array<std::unique_ptr<AppleII::Card>, 7> cards_;
Cycles cycles_since_card_update_;
std::vector<AppleII::Card *> every_cycle_cards_;
std::vector<AppleII::Card *> just_in_time_cards_;
int stretched_cycles_since_card_update_ = 0;
void install_card(std::size_t slot, AppleII::Card *card) {
assert(slot >= 1 && slot < 8);
cards_[slot - 1].reset(card);
card->set_delegate(this);
pick_card_messaging_group(card);
}
bool is_every_cycle_card(AppleII::Card *card) {
return !card->get_select_constraints();
}
void pick_card_messaging_group(AppleII::Card *card) {
const bool is_every_cycle = is_every_cycle_card(card);
std::vector<AppleII::Card *> &intended = is_every_cycle ? every_cycle_cards_ : just_in_time_cards_;
std::vector<AppleII::Card *> &undesired = is_every_cycle ? just_in_time_cards_ : every_cycle_cards_;
if(std::find(intended.begin(), intended.end(), card) != intended.end()) return;
auto old_membership = std::find(undesired.begin(), undesired.end(), card);
if(old_membership != undesired.end()) undesired.erase(old_membership);
intended.push_back(card);
}
void card_did_change_select_constraints(AppleII::Card *card) override {
pick_card_messaging_group(card);
}
AppleII::DiskIICard *diskii_card() {
return dynamic_cast<AppleII::DiskIICard *>(cards_[5].get());
}
// MARK: - Memory Map
struct MemoryBlock {
uint8_t *read_pointer = nullptr;
uint8_t *write_pointer = nullptr;
} memory_blocks_[4]; // The IO page isn't included.
// MARK: - The language card.
struct {
bool bank1 = false;
bool read = false;
bool pre_write = false;
bool write = false;
} language_card_;
bool has_language_card_ = true;
void set_language_card_paging() {
if(has_language_card_ && !language_card_.write) {
memory_blocks_[2].write_pointer = &ram_[48*1024 + (language_card_.bank1 ? 0x1000 : 0x0000)];
memory_blocks_[3].write_pointer = &ram_[56*1024];
} else {
memory_blocks_[2].write_pointer = memory_blocks_[3].write_pointer = nullptr;
}
if(has_language_card_ && language_card_.read) {
memory_blocks_[2].read_pointer = &ram_[48*1024 + (language_card_.bank1 ? 0x1000 : 0x0000)];
memory_blocks_[3].read_pointer = &ram_[56*1024];
} else {
memory_blocks_[2].read_pointer = rom_.data();
memory_blocks_[3].read_pointer = rom_.data() + 0x1000;
}
}
// MARK - typing
std::unique_ptr<Utility::StringSerialiser> string_serialiser_;
// MARK - quick loading
bool should_load_quickly_ = false;
// MARK - joysticks
class Joystick: public Inputs::ConcreteJoystick {
public:
Joystick() :
ConcreteJoystick({
Input(Input::Horizontal),
Input(Input::Vertical),
// The Apple II offers three buttons between two joysticks;
// this emulator puts three buttons on each joystick and
// combines them.
Input(Input::Fire, 0),
Input(Input::Fire, 1),
Input(Input::Fire, 2),
}) {}
void did_set_input(const Input &input, float value) override {
if(!input.info.control.index && (input.type == Input::Type::Horizontal || input.type == Input::Type::Vertical))
axes[(input.type == Input::Type::Horizontal) ? 0 : 1] = 1.0f - value;
}
void did_set_input(const Input &input, bool value) override {
if(input.type == Input::Type::Fire && input.info.control.index < 3) {
buttons[input.info.control.index] = value;
}
}
bool buttons[3] = {false, false, false};
float axes[2] = {0.5f, 0.5f};
};
// On an Apple II, the programmer strobes 0xc070 and that causes each analogue input
// to begin a charge and discharge cycle **if they are not already charging**.
// The greater the analogue input, the faster they will charge and therefore the sooner
// they will discharge.
//
// This emulator models that with analogue_charge_ being essentially the amount of time,
// in charge threshold units, since 0xc070 was last strobed. But if any of the analogue
// inputs were already partially charged then they gain a bias in analogue_biases_.
//
// It's a little indirect, but it means only having to increment the one value in the
// main loop.
float analogue_charge_ = 0.0f;
float analogue_biases_[4] = {0.0f, 0.0f, 0.0f, 0.0f};
std::vector<std::unique_ptr<Inputs::Joystick>> joysticks_;
bool analogue_channel_is_discharged(size_t channel) {
return static_cast<Joystick *>(joysticks_[channel >> 1].get())->axes[channel & 1] < analogue_charge_ + analogue_biases_[channel];
}
public:
ConcreteMachine(const Analyser::Static::AppleII::Target &target, const ROMMachine::ROMFetcher &rom_fetcher):
m6502_(*this),
video_bus_handler_(ram_),
audio_toggle_(audio_queue_),
speaker_(audio_toggle_) {
// The system's master clock rate.
const float master_clock = 14318180.0;
// This is where things get slightly convoluted: establish the machine as having a clock rate
// equal to the number of cycles of work the 6502 will actually achieve. Which is less than
// the master clock rate divided by 14 because every 65th cycle is extended by one seventh.
set_clock_rate((master_clock / 14.0) * 65.0 / (65.0 + 1.0 / 7.0));
// The speaker, however, should think it is clocked at half the master clock, per a general
// decision to sample it at seven times the CPU clock (plus stretches).
speaker_.set_input_rate(static_cast<float>(master_clock / (2.0 * static_cast<float>(audio_divider))));
// Apply a 6Khz low-pass filter. This was picked by ear and by an attempt to understand the
// Apple II schematic but, well, I don't claim much insight on the latter. This is definitely
// something to review in the future.
speaker_.set_high_frequency_cutoff(6000);
// Also, start with randomised memory contents.
Memory::Fuzz(ram_, sizeof(ram_));
// Add a couple of joysticks.
joysticks_.emplace_back(new Joystick);
joysticks_.emplace_back(new Joystick);
// Pick the required ROMs.
using Target = Analyser::Static::AppleII::Target;
std::vector<std::string> rom_names = {"apple2-character.rom"};
switch(target.model) {
default:
rom_names.push_back("apple2o.rom");
break;
case Target::Model::IIplus:
rom_names.push_back("apple2.rom");
break;
}
const auto roms = rom_fetcher("AppleII", rom_names);
if(!roms[0] || !roms[1]) {
throw ROMMachine::Error::MissingROMs;
}
character_rom_ = std::move(*roms[0]);
rom_ = std::move(*roms[1]);
if(rom_.size() > 12*1024) {
rom_.erase(rom_.begin(), rom_.begin() + static_cast<off_t>(rom_.size()) - 12*1024);
}
if(target.disk_controller != Target::DiskController::None) {
// Apple recommended slot 6 for the (first) Disk II.
install_card(6, new AppleII::DiskIICard(rom_fetcher, target.disk_controller == Target::DiskController::SixteenSector));
}
// Set up the default memory blocks.
memory_blocks_[0].read_pointer = memory_blocks_[0].write_pointer = ram_;
memory_blocks_[1].read_pointer = memory_blocks_[1].write_pointer = &ram_[0x200];
set_language_card_paging();
insert_media(target.media);
}
~ConcreteMachine() {
audio_queue_.flush();
}
void setup_output(float aspect_ratio) override {
video_.reset(new AppleII::Video::Video<VideoBusHandler>(video_bus_handler_));
video_->set_character_rom(character_rom_);
}
void close_output() override {
video_.reset();
}
Outputs::CRT::CRT *get_crt() override {
return video_->get_crt();
}
Outputs::Speaker::Speaker *get_speaker() override {
return &speaker_;
}
forceinline Cycles perform_bus_operation(const CPU::MOS6502::BusOperation operation, const uint16_t address, uint8_t *const value) {
++ cycles_since_video_update_;
++ cycles_since_card_update_;
cycles_since_audio_update_ += Cycles(7);
// The Apple II has a slightly weird timing pattern: every 65th CPU cycle is stretched
// by an extra 1/7th. That's because one cycle lasts 3.5 NTSC colour clocks, so after
// 65 cycles a full line of 227.5 colour clocks have passed. But the high-rate binary
// signal approximation that produces colour needs to be in phase, so a stretch of exactly
// 0.5 further colour cycles is added. The video class handles that implicitly, but it
// needs to be accumulated here for the audio.
cycles_into_current_line_ = (cycles_into_current_line_ + 1) % 65;
const bool is_stretched_cycle = !cycles_into_current_line_;
if(is_stretched_cycle) {
++ cycles_since_audio_update_;
++ stretched_cycles_since_card_update_;
}
/*
There are five distinct zones of memory on an Apple II:
0000 to 0200 : the zero and stack pages, which can be paged independently on a IIe
0200 to c000 : the main block of RAM, which can be paged on a IIe
c000 to d000 : the IO area, including card ROMs
d000 to e000 : the low ROM area, which can contain indepdently-paged RAM with a language card
e000 onward : the rest of ROM, also potentially replaced with RAM by a language card
*/
uint16_t accessed_address = address;
MemoryBlock *block = nullptr;
if(address < 0x200) block = &memory_blocks_[0];
else if(address < 0xc000) {
if(address < 0x6000 && !isReadOperation(operation)) update_video();
block = &memory_blocks_[1];
accessed_address -= 0x200;
}
else if(address < 0xd000) block = nullptr;
else if(address < 0xe000) {block = &memory_blocks_[2]; accessed_address -= 0xd000; }
else { block = &memory_blocks_[3]; accessed_address -= 0xe000; }
bool has_updated_cards = false;
if(block) {
if(isReadOperation(operation)) *value = block->read_pointer[accessed_address];
else if(block->write_pointer) block->write_pointer[accessed_address] = *value;
if(should_load_quickly_) {
// Check for a prima facie entry into RWTS.
if(operation == CPU::MOS6502::BusOperation::ReadOpcode && address == 0xb7b5) {
// Grab the IO control block address for inspection.
uint16_t io_control_block_address =
static_cast<uint16_t>(
(m6502_.get_value_of_register(CPU::MOS6502::Register::A) << 8) |
m6502_.get_value_of_register(CPU::MOS6502::Register::Y)
);
// Verify that this is table type one, for execution on card six,
// against drive 1 or 2, and that the command is either a seek or a sector read.
if(
ram_[io_control_block_address+0x00] == 0x01 &&
ram_[io_control_block_address+0x01] == 0x60 &&
ram_[io_control_block_address+0x02] > 0 && ram_[io_control_block_address+0x02] < 3 &&
ram_[io_control_block_address+0x0c] < 2
) {
const uint8_t iob_track = ram_[io_control_block_address+4];
const uint8_t iob_sector = ram_[io_control_block_address+5];
const uint8_t iob_drive = ram_[io_control_block_address+2] - 1;
// Get the track identified and store the new head position.
auto track = diskii_card()->get_drive(iob_drive).step_to(Storage::Disk::HeadPosition(iob_track));
// DOS 3.3 keeps the current track (unspecified drive) in 0x478; the current track for drive 1 and drive 2
// is also kept in that Disk II card's screen hole.
ram_[0x478] = iob_track;
if(ram_[io_control_block_address+0x02] == 1) {
ram_[0x47e] = iob_track;
} else {
ram_[0x4fe] = iob_track;
}
// Check whether this is a read, not merely a seek.
if(ram_[io_control_block_address+0x0c] == 1) {
// Apple the DOS 3.3 formula to map the requested logical sector to a physical sector.
const int physical_sector = (iob_sector == 15) ? 15 : ((iob_sector * 13) % 15);
// Parse the entire track. TODO: cache these.
auto sector_map = Storage::Encodings::AppleGCR::sectors_from_segment(
Storage::Disk::track_serialisation(*track, Storage::Time(1, 50000)));
bool found_sector = false;
for(const auto &pair: sector_map) {
if(pair.second.address.sector == physical_sector) {
found_sector = true;
// Copy the sector contents to their destination.
uint16_t target = static_cast<uint16_t>(
ram_[io_control_block_address+8] |
(ram_[io_control_block_address+9] << 8)
);
for(size_t c = 0; c < 256; ++c) {
ram_[target] = pair.second.data[c];
++target;
}
// Set no error encountered.
ram_[io_control_block_address + 0xd] = 0;
break;
}
}
if(found_sector) {
// Set no error in the flags register too, and RTS.
m6502_.set_value_of_register(CPU::MOS6502::Register::Flags, m6502_.get_value_of_register(CPU::MOS6502::Register::Flags) & ~1);
*value = 0x60;
}
} else {
// No error encountered; RTS.
m6502_.set_value_of_register(CPU::MOS6502::Register::Flags, m6502_.get_value_of_register(CPU::MOS6502::Register::Flags) & ~1);
*value = 0x60;
}
}
}
}
} else {
// Assume a vapour read unless it turns out otherwise; this is a little
// wasteful but works for now.
//
// Longer version: like many other machines, when the Apple II reads from
// an address at which no hardware loads the data bus, through a process of
// practical analogue effects it'll end up receiving whatever was last on
// the bus. Which will always be whatever the video circuit fetched because
// that fetches in between every instruction.
//
// So this code assumes that'll happen unless it later determines that it
// doesn't. The call into the video isn't free because it's a just-in-time
// actor, but this will actually be the result most of the time so it's not
// too terrible.
if(isReadOperation(operation) && address != 0xc000) {
*value = video_->get_last_read_value(cycles_since_video_update_);
}
switch(address) {
default:
if(isReadOperation(operation)) {
// Read-only switches.
switch(address) {
default: break;
case 0xc000:
if(string_serialiser_) {
*value = string_serialiser_->head() | 0x80;
} else {
*value = keyboard_input_;
}
break;
case 0xc061: // Switch input 0.
*value &= 0x7f;
if(static_cast<Joystick *>(joysticks_[0].get())->buttons[0] || static_cast<Joystick *>(joysticks_[1].get())->buttons[2])
*value |= 0x80;
break;
case 0xc062: // Switch input 1.
*value &= 0x7f;
if(static_cast<Joystick *>(joysticks_[0].get())->buttons[1] || static_cast<Joystick *>(joysticks_[1].get())->buttons[1])
*value |= 0x80;
break;
case 0xc063: // Switch input 2.
*value &= 0x7f;
if(static_cast<Joystick *>(joysticks_[0].get())->buttons[2] || static_cast<Joystick *>(joysticks_[1].get())->buttons[0])
*value |= 0x80;
break;
case 0xc064: // Analogue input 0.
case 0xc065: // Analogue input 1.
case 0xc066: // Analogue input 2.
case 0xc067: { // Analogue input 3.
const size_t input = address - 0xc064;
*value &= 0x7f;
if(analogue_channel_is_discharged(input)) {
*value |= 0x80;
}
} break;
}
} else {
// Write-only switches.
}
break;
case 0xc070: { // Permit analogue inputs that are currently discharged to begin a charge cycle.
// Ensure those that were still charging retain that state.
for(size_t c = 0; c < 4; ++c) {
if(analogue_channel_is_discharged(c)) {
analogue_biases_[c] = 0.0f;
} else {
analogue_biases_[c] += analogue_charge_;
}
}
analogue_charge_ = 0.0f;
} break;
/* Read-write switches. */
case 0xc050: update_video(); video_->set_graphics_mode(); break;
case 0xc051: update_video(); video_->set_text_mode(); break;
case 0xc052: update_video(); video_->set_mixed_mode(false); break;
case 0xc053: update_video(); video_->set_mixed_mode(true); break;
case 0xc054: update_video(); video_->set_video_page(0); break;
case 0xc055: update_video(); video_->set_video_page(1); break;
case 0xc056: update_video(); video_->set_low_resolution(); break;
case 0xc057: update_video(); video_->set_high_resolution(); break;
case 0xc010:
keyboard_input_ &= 0x7f;
if(string_serialiser_) {
if(!string_serialiser_->advance())
string_serialiser_.reset();
}
break;
case 0xc030:
update_audio();
audio_toggle_.set_output(!audio_toggle_.get_output());
break;
case 0xc080: case 0xc084: case 0xc088: case 0xc08c:
case 0xc081: case 0xc085: case 0xc089: case 0xc08d:
case 0xc082: case 0xc086: case 0xc08a: case 0xc08e:
case 0xc083: case 0xc087: case 0xc08b: case 0xc08f:
// Quotes below taken from Understanding the Apple II, p. 5-28 and 5-29.
// "A3 controls the 4K bank selection"
language_card_.bank1 = (address&8);
// "Access to $C080, $C083, $C084, $0087, $C088, $C08B, $C08C, or $C08F sets the READ ENABLE flip-flop"
// (other accesses reset it)
language_card_.read = !(((address&2) >> 1) ^ (address&1));
// "The WRITE ENABLE' flip-flop is reset by an odd read access to the $C08X range when the PRE-WRITE flip-flop is set."
if(language_card_.pre_write && isReadOperation(operation) && (address&1)) language_card_.write = false;
// "[The WRITE ENABLE' flip-flop] is set by an even access in the $C08X range."
if(!(address&1)) language_card_.write = true;
// ("Any other type of access causes the WRITE ENABLE' flip-flop to hold its current state.")
// "The PRE-WRITE flip-flop is set by an odd read access in the $C08X range. It is reset by an even access or a write access."
language_card_.pre_write = isReadOperation(operation) ? (address&1) : false;
set_language_card_paging();
break;
}
/*
Communication with cards follows.
*/
if(address >= 0xc090 && address < 0xc800) {
// If this is a card access, figure out which card is at play before determining
// the totality of who needs messaging.
size_t card_number = 0;
AppleII::Card::Select select = AppleII::Card::None;
if(address >= 0xc100) {
/*
Decode the area conventionally used by cards for ROMs:
0xCn00 to 0xCnff: card n.
*/
card_number = (address - 0xc100) >> 8;
select = AppleII::Card::Device;
} else {
/*
Decode the area conventionally used by cards for registers:
C0n0 to C0nF: card n - 8.
*/
card_number = (address - 0xc090) >> 4;
select = AppleII::Card::IO;
}
// If the selected card is a just-in-time card, update the just-in-time cards,
// and then message it specifically.
const bool is_read = isReadOperation(operation);
AppleII::Card *const target = cards_[card_number].get();
if(target && !is_every_cycle_card(target)) {
update_just_in_time_cards();
target->perform_bus_operation(select, is_read, address, value);
}
// Update all the every-cycle cards regardless, but send them a ::None select if they're
// not the one actually selected.
for(const auto &card: every_cycle_cards_) {
card->run_for(Cycles(1), is_stretched_cycle);
card->perform_bus_operation(
(card == target) ? select : AppleII::Card::None,
is_read, address, value);
}
has_updated_cards = true;
}
}
if(!has_updated_cards && !every_cycle_cards_.empty()) {
// Update all every-cycle cards and give them the cycle.
const bool is_read = isReadOperation(operation);
for(const auto &card: every_cycle_cards_) {
card->run_for(Cycles(1), is_stretched_cycle);
card->perform_bus_operation(AppleII::Card::None, is_read, address, value);
}
}
// Update analogue charge level.
analogue_charge_ = std::min(analogue_charge_ + 1.0f / 2820.0f, 1.1f);
return Cycles(1);
}
void flush() {
update_video();
update_audio();
update_just_in_time_cards();
audio_queue_.perform();
}
void run_for(const Cycles cycles) override {
m6502_.run_for(cycles);
}
void set_key_pressed(Key key, char value, bool is_pressed) override {
if(key == Key::F12) {
m6502_.set_reset_line(is_pressed);
return;
}
if(is_pressed) {
// If no ASCII value is supplied, look for a few special cases.
if(!value) {
switch(key) {
case Key::Left: value = 8; break;
case Key::Right: value = 21; break;
case Key::Down: value = 10; break;
default: break;
}
}
keyboard_input_ = static_cast<uint8_t>(toupper(value) | 0x80);
}
}
Inputs::Keyboard &get_keyboard() override {
return *this;
}
void type_string(const std::string &string) override {
string_serialiser_.reset(new Utility::StringSerialiser(string, true));
}
// MARK: MediaTarget
bool insert_media(const Analyser::Static::Media &media) override {
if(!media.disks.empty()) {
auto diskii = diskii_card();
if(diskii) diskii->set_disk(media.disks[0], 0);
}
return true;
}
// MARK: Activity::Source
void set_activity_observer(Activity::Observer *observer) override {
for(const auto &card: cards_) {
if(card) card->set_activity_observer(observer);
}
}
// MARK: Options
std::vector<std::unique_ptr<Configurable::Option>> get_options() override {
return AppleII::get_options();
}
void set_selections(const Configurable::SelectionSet &selections_by_option) override {
bool quickload;
if(Configurable::get_quick_load_tape(selections_by_option, quickload)) {
should_load_quickly_ = quickload;
}
}
Configurable::SelectionSet get_accurate_selections() override {
Configurable::SelectionSet selection_set;
Configurable::append_quick_load_tape_selection(selection_set, false);
return selection_set;
}
Configurable::SelectionSet get_user_friendly_selections() override {
Configurable::SelectionSet selection_set;
Configurable::append_quick_load_tape_selection(selection_set, true);
return selection_set;
}
// MARK: JoystickMachine
std::vector<std::unique_ptr<Inputs::Joystick>> &get_joysticks() override {
return joysticks_;
}
};
}
using namespace AppleII;
Machine *Machine::AppleII(const Analyser::Static::Target *target, const ROMMachine::ROMFetcher &rom_fetcher) {
using Target = Analyser::Static::AppleII::Target;
const Target *const appleii_target = dynamic_cast<const Target *>(target);
return new ConcreteMachine(*appleii_target, rom_fetcher);
}
Machine::~Machine() {}
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