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854 lines
30 KiB
C++
854 lines
30 KiB
C++
//
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// AppleII.cpp
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// Clock Signal
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//
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// Created by Thomas Harte on 14/04/2018.
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// Copyright 2018 Thomas Harte. All rights reserved.
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//
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#include "AppleII.hpp"
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#include "../../Activity/Source.hpp"
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#include "../MediaTarget.hpp"
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#include "../CRTMachine.hpp"
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#include "../JoystickMachine.hpp"
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#include "../KeyboardMachine.hpp"
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#include "../Utility/MemoryFuzzer.hpp"
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#include "../Utility/StringSerialiser.hpp"
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#include "../../Processors/6502/6502.hpp"
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#include "../../Components/AudioToggle/AudioToggle.hpp"
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#include "../../Outputs/Speaker/Implementation/LowpassSpeaker.hpp"
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#include "../../Outputs/Log.hpp"
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#include "Card.hpp"
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#include "DiskIICard.hpp"
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#include "Video.hpp"
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#include "../../Analyser/Static/AppleII/Target.hpp"
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#include "../../ClockReceiver/ForceInline.hpp"
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#include <algorithm>
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#include <array>
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#include <memory>
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namespace {
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#define is_iie() ((model == Analyser::Static::AppleII::Target::Model::IIe) || (model == Analyser::Static::AppleII::Target::Model::EnhancedIIe))
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template <Analyser::Static::AppleII::Target::Model model> class ConcreteMachine:
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public CRTMachine::Machine,
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public MediaTarget::Machine,
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public KeyboardMachine::Machine,
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public CPU::MOS6502::BusHandler,
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public Inputs::Keyboard,
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public AppleII::Machine,
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public Activity::Source,
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public JoystickMachine::Machine,
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public AppleII::Card::Delegate {
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private:
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struct VideoBusHandler : public AppleII::Video::BusHandler {
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public:
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VideoBusHandler(uint8_t *ram, uint8_t *aux_ram) : ram_(ram), aux_ram_(aux_ram) {}
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void perform_read(uint16_t address, size_t count, uint8_t *base_target, uint8_t *auxiliary_target) {
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memcpy(base_target, &ram_[address], count);
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memcpy(auxiliary_target, &aux_ram_[address], count);
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}
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private:
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uint8_t *ram_, *aux_ram_;
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};
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CPU::MOS6502::Processor<(model == Analyser::Static::AppleII::Target::Model::EnhancedIIe) ? CPU::MOS6502::Personality::PSynertek65C02 : CPU::MOS6502::Personality::P6502, ConcreteMachine, false> m6502_;
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VideoBusHandler video_bus_handler_;
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std::unique_ptr<AppleII::Video::Video<VideoBusHandler, is_iie()>> video_;
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int cycles_into_current_line_ = 0;
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Cycles cycles_since_video_update_;
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void update_video() {
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video_->run_for(cycles_since_video_update_.flush());
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}
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static const int audio_divider = 8;
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void update_audio() {
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speaker_.run_for(audio_queue_, cycles_since_audio_update_.divide(Cycles(audio_divider)));
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}
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void update_just_in_time_cards() {
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for(const auto &card : just_in_time_cards_) {
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card->run_for(cycles_since_card_update_, stretched_cycles_since_card_update_);
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}
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cycles_since_card_update_ = 0;
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stretched_cycles_since_card_update_ = 0;
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}
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uint8_t ram_[65536], aux_ram_[65536];
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std::vector<uint8_t> rom_;
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std::vector<uint8_t> character_rom_;
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uint8_t keyboard_input_ = 0x00;
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bool key_is_down_ = false;
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uint8_t get_keyboard_input() {
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if(string_serialiser_) {
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return string_serialiser_->head() | 0x80;
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} else {
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return keyboard_input_;
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}
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}
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Concurrency::DeferringAsyncTaskQueue audio_queue_;
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Audio::Toggle audio_toggle_;
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Outputs::Speaker::LowpassSpeaker<Audio::Toggle> speaker_;
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Cycles cycles_since_audio_update_;
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// MARK: - Cards
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std::array<std::unique_ptr<AppleII::Card>, 7> cards_;
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Cycles cycles_since_card_update_;
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std::vector<AppleII::Card *> every_cycle_cards_;
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std::vector<AppleII::Card *> just_in_time_cards_;
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int stretched_cycles_since_card_update_ = 0;
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void install_card(std::size_t slot, AppleII::Card *card) {
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assert(slot >= 1 && slot < 8);
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cards_[slot - 1].reset(card);
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card->set_delegate(this);
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pick_card_messaging_group(card);
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}
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bool is_every_cycle_card(AppleII::Card *card) {
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return !card->get_select_constraints();
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}
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void pick_card_messaging_group(AppleII::Card *card) {
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const bool is_every_cycle = is_every_cycle_card(card);
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std::vector<AppleII::Card *> &intended = is_every_cycle ? every_cycle_cards_ : just_in_time_cards_;
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std::vector<AppleII::Card *> &undesired = is_every_cycle ? just_in_time_cards_ : every_cycle_cards_;
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if(std::find(intended.begin(), intended.end(), card) != intended.end()) return;
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auto old_membership = std::find(undesired.begin(), undesired.end(), card);
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if(old_membership != undesired.end()) undesired.erase(old_membership);
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intended.push_back(card);
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}
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void card_did_change_select_constraints(AppleII::Card *card) override {
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pick_card_messaging_group(card);
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}
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AppleII::DiskIICard *diskii_card() {
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return dynamic_cast<AppleII::DiskIICard *>(cards_[5].get());
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}
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// MARK: - Memory Map.
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/*
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The Apple II's paging mechanisms are byzantine to say the least. Painful is
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another appropriate adjective.
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On a II and II+ there are five distinct zones of memory:
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0000 to c000 : the main block of RAM
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c000 to d000 : the IO area, including card ROMs
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d000 to e000 : the low ROM area, which can alternatively contain either one of two 4kb blocks of RAM with a language card
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e000 onward : the rest of ROM, also potentially replaced with RAM by a language card
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On a IIe with auxiliary memory the following orthogonal changes also need to be factored in:
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0000 to 0200 : can be paged independently of the rest of RAM, other than part of the language card area which pages with it
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0400 to 0800 : the text screen, can be configured to write to auxiliary RAM
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2000 to 4000 : the graphics screen, which can be configured to write to auxiliary RAM
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c100 to d000 : can be used to page an additional 3.75kb of ROM, replacing the IO area
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c300 to c400 : can contain the same 256-byte segment of the ROM as if the whole IO area were switched, but while leaving cards visible in the rest
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c800 to d000 : can contain ROM separately from the region below c800
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If dealt with as individual blocks in the inner loop, that would therefore imply mapping
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an address to one of 13 potential pageable zones. So I've gone reductive and surrendered
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to paging every 6502 page of memory independently. It makes the paging events more expensive,
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but hopefully more clear.
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*/
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uint8_t *read_pages_[256]; // each is a pointer to the 256-block of memory the CPU should read when accessing that page of memory
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uint8_t *write_pages_[256]; // as per read_pages_, but this is where the CPU should write. If a pointer is nullptr, don't write.
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void page(int start, int end, uint8_t *read, uint8_t *write) {
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for(int position = start; position < end; ++position) {
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read_pages_[position] = read;
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if(read) read += 256;
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write_pages_[position] = write;
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if(write) write += 256;
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}
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}
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// MARK: - The language card.
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struct {
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bool bank1 = false;
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bool read = false;
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bool pre_write = false;
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bool write = false;
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} language_card_;
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bool has_language_card_ = true;
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void set_language_card_paging() {
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uint8_t *const ram = alternative_zero_page_ ? aux_ram_ : ram_;
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uint8_t *const rom = is_iie() ? &rom_[3840] : rom_.data();
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page(0xd0, 0xe0,
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language_card_.read ? &ram[language_card_.bank1 ? 0xd000 : 0xc000] : rom,
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language_card_.write ? nullptr : &ram[language_card_.bank1 ? 0xd000 : 0xc000]);
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page(0xe0, 0x100,
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language_card_.read ? &ram[0xe000] : &rom[0x1000],
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language_card_.write ? nullptr : &ram[0xe000]);
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}
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// MARK - The IIe's ROM controls.
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bool internal_CX_rom_ = false;
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bool slot_C3_rom_ = false;
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bool internal_c8_rom_ = false;
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void set_card_paging() {
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page(0xc1, 0xc8, internal_CX_rom_ ? rom_.data() : nullptr, nullptr);
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if(!internal_CX_rom_) {
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if(!slot_C3_rom_) read_pages_[0xc3] = &rom_[0xc300 - 0xc100];
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}
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page(0xc8, 0xd0, (internal_CX_rom_ || internal_c8_rom_) ? &rom_[0xc800 - 0xc100] : nullptr, nullptr);
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}
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// MARK - The IIe's auxiliary RAM controls.
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bool alternative_zero_page_ = false;
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void set_zero_page_paging() {
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if(alternative_zero_page_) {
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read_pages_[0] = aux_ram_;
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} else {
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read_pages_[0] = ram_;
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}
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read_pages_[1] = read_pages_[0] + 256;
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write_pages_[0] = read_pages_[0];
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write_pages_[1] = read_pages_[1];
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}
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bool read_auxiliary_memory_ = false;
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bool write_auxiliary_memory_ = false;
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void set_main_paging() {
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page(0x02, 0xc0,
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read_auxiliary_memory_ ? &aux_ram_[0x0200] : &ram_[0x0200],
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write_auxiliary_memory_ ? &aux_ram_[0x0200] : &ram_[0x0200]);
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if(video_ && video_->get_80_store()) {
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bool use_aux_ram = video_->get_page2();
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page(0x04, 0x08,
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use_aux_ram ? &aux_ram_[0x0400] : &ram_[0x0400],
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use_aux_ram ? &aux_ram_[0x0400] : &ram_[0x0400]);
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if(video_->get_high_resolution()) {
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page(0x20, 0x40,
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use_aux_ram ? &aux_ram_[0x2000] : &ram_[0x2000],
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use_aux_ram ? &aux_ram_[0x2000] : &ram_[0x2000]);
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}
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}
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}
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// MARK - typing
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std::unique_ptr<Utility::StringSerialiser> string_serialiser_;
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// MARK - joysticks
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class Joystick: public Inputs::ConcreteJoystick {
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public:
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Joystick() :
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ConcreteJoystick({
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Input(Input::Horizontal),
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Input(Input::Vertical),
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// The Apple II offers three buttons between two joysticks;
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// this emulator puts three buttons on each joystick and
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// combines them.
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Input(Input::Fire, 0),
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Input(Input::Fire, 1),
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Input(Input::Fire, 2),
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}) {}
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void did_set_input(const Input &input, float value) override {
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if(!input.info.control.index && (input.type == Input::Type::Horizontal || input.type == Input::Type::Vertical))
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axes[(input.type == Input::Type::Horizontal) ? 0 : 1] = 1.0f - value;
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}
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void did_set_input(const Input &input, bool value) override {
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if(input.type == Input::Type::Fire && input.info.control.index < 3) {
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buttons[input.info.control.index] = value;
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}
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}
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bool buttons[3] = {false, false, false};
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float axes[2] = {0.5f, 0.5f};
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};
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// On an Apple II, the programmer strobes 0xc070 and that causes each analogue input
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// to begin a charge and discharge cycle **if they are not already charging**.
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// The greater the analogue input, the faster they will charge and therefore the sooner
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// they will discharge.
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//
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// This emulator models that with analogue_charge_ being essentially the amount of time,
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// in charge threshold units, since 0xc070 was last strobed. But if any of the analogue
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// inputs were already partially charged then they gain a bias in analogue_biases_.
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//
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// It's a little indirect, but it means only having to increment the one value in the
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// main loop.
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float analogue_charge_ = 0.0f;
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float analogue_biases_[4] = {0.0f, 0.0f, 0.0f, 0.0f};
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std::vector<std::unique_ptr<Inputs::Joystick>> joysticks_;
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bool analogue_channel_is_discharged(size_t channel) {
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return (1.0f - static_cast<Joystick *>(joysticks_[channel >> 1].get())->axes[channel & 1]) < analogue_charge_ + analogue_biases_[channel];
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}
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// The IIe has three keys that are wired directly to the same input as the joystick buttons.
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bool open_apple_is_pressed_ = false;
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bool closed_apple_is_pressed_ = false;
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public:
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ConcreteMachine(const Analyser::Static::AppleII::Target &target, const ROMMachine::ROMFetcher &rom_fetcher):
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m6502_(*this),
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video_bus_handler_(ram_, aux_ram_),
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audio_toggle_(audio_queue_),
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speaker_(audio_toggle_) {
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// The system's master clock rate.
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const float master_clock = 14318180.0;
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// This is where things get slightly convoluted: establish the machine as having a clock rate
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// equal to the number of cycles of work the 6502 will actually achieve. Which is less than
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// the master clock rate divided by 14 because every 65th cycle is extended by one seventh.
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set_clock_rate((master_clock / 14.0) * 65.0 / (65.0 + 1.0 / 7.0));
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// The speaker, however, should think it is clocked at half the master clock, per a general
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// decision to sample it at seven times the CPU clock (plus stretches).
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speaker_.set_input_rate(static_cast<float>(master_clock / (2.0 * static_cast<float>(audio_divider))));
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// Apply a 6Khz low-pass filter. This was picked by ear and by an attempt to understand the
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// Apple II schematic but, well, I don't claim much insight on the latter. This is definitely
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// something to review in the future.
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speaker_.set_high_frequency_cutoff(6000);
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// Also, start with randomised memory contents.
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Memory::Fuzz(ram_, sizeof(ram_));
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Memory::Fuzz(aux_ram_, sizeof(aux_ram_));
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// Add a couple of joysticks.
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joysticks_.emplace_back(new Joystick);
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joysticks_.emplace_back(new Joystick);
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// Pick the required ROMs.
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using Target = Analyser::Static::AppleII::Target;
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std::vector<std::string> rom_names;
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size_t rom_size = 12*1024;
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switch(target.model) {
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default:
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rom_names.push_back("apple2-character.rom");
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rom_names.push_back("apple2o.rom");
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break;
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case Target::Model::IIplus:
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rom_names.push_back("apple2-character.rom");
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rom_names.push_back("apple2.rom");
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break;
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case Target::Model::IIe:
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rom_size += 3840;
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rom_names.push_back("apple2eu-character.rom");
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rom_names.push_back("apple2eu.rom");
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break;
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case Target::Model::EnhancedIIe:
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rom_size += 3840;
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rom_names.push_back("apple2e-character.rom");
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rom_names.push_back("apple2e.rom");
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break;
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}
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const auto roms = rom_fetcher("AppleII", rom_names);
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if(!roms[0] || !roms[1]) {
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throw ROMMachine::Error::MissingROMs;
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}
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rom_ = std::move(*roms[1]);
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if(rom_.size() > rom_size) {
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rom_.erase(rom_.begin(), rom_.end() - static_cast<off_t>(rom_size));
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}
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character_rom_ = std::move(*roms[0]);
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if(target.disk_controller != Target::DiskController::None) {
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// Apple recommended slot 6 for the (first) Disk II.
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install_card(6, new AppleII::DiskIICard(rom_fetcher, target.disk_controller == Target::DiskController::SixteenSector));
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}
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// Set up the default memory blocks. On a II or II+ these values will never change.
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// On a IIe they'll be affected by selection of auxiliary RAM.
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set_main_paging();
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set_zero_page_paging();
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// Set the whole card area to initially backed by nothing.
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page(0xc0, 0xd0, nullptr, nullptr);
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// Set proper values for the language card/ROM area.
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set_language_card_paging();
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insert_media(target.media);
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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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video_.reset(new AppleII::Video::Video<VideoBusHandler, is_iie()>(video_bus_handler_));
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video_->set_character_rom(character_rom_);
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}
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void close_output() override {
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video_.reset();
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}
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Outputs::CRT::CRT *get_crt() override {
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return video_->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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forceinline Cycles perform_bus_operation(const CPU::MOS6502::BusOperation operation, const uint16_t address, uint8_t *const value) {
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++ cycles_since_video_update_;
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++ cycles_since_card_update_;
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cycles_since_audio_update_ += Cycles(7);
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// The Apple II has a slightly weird timing pattern: every 65th CPU cycle is stretched
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// by an extra 1/7th. That's because one cycle lasts 3.5 NTSC colour clocks, so after
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// 65 cycles a full line of 227.5 colour clocks have passed. But the high-rate binary
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// signal approximation that produces colour needs to be in phase, so a stretch of exactly
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// 0.5 further colour cycles is added. The video class handles that implicitly, but it
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// needs to be accumulated here for the audio.
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cycles_into_current_line_ = (cycles_into_current_line_ + 1) % 65;
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const bool is_stretched_cycle = !cycles_into_current_line_;
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if(is_stretched_cycle) {
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++ cycles_since_audio_update_;
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++ stretched_cycles_since_card_update_;
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}
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bool has_updated_cards = false;
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if(read_pages_[address >> 8]) {
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if(isReadOperation(operation)) *value = read_pages_[address >> 8][address & 0xff];
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else {
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if(address >= 0x200 && address < 0x6000) update_video();
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if(write_pages_[address >> 8]) write_pages_[address >> 8][address & 0xff] = *value;
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}
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if(is_iie() && address >= 0xc300 && address < 0xd000) {
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bool internal_c8_rom = internal_c8_rom_;
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internal_c8_rom |= ((address >> 8) == 0xc3) && !slot_C3_rom_;
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internal_c8_rom &= (address != 0xcfff);
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if(internal_c8_rom != internal_c8_rom_) {
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internal_c8_rom_ = internal_c8_rom;
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set_card_paging();
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}
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}
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} else {
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// Assume a vapour read unless it turns out otherwise; this is a little
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// 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:
|
|
*value = get_keyboard_input();
|
|
break;
|
|
case 0xc001: case 0xc002: case 0xc003: case 0xc004: case 0xc005: case 0xc006: case 0xc007:
|
|
case 0xc008: case 0xc009: case 0xc00a: case 0xc00b: case 0xc00c: case 0xc00d: case 0xc00e: case 0xc00f:
|
|
*value = (*value & 0x80) | (get_keyboard_input() & 0x7f);
|
|
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] ||
|
|
(is_iie() && open_apple_is_pressed_)
|
|
)
|
|
*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] ||
|
|
(is_iie() && closed_apple_is_pressed_)
|
|
)
|
|
*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;
|
|
|
|
// The IIe-only state reads follow...
|
|
#define IIeSwitchRead(s) *value = get_keyboard_input(); if(is_iie()) *value = (*value & 0x7f) | (s ? 0x80 : 0x00);
|
|
case 0xc011: IIeSwitchRead(language_card_.bank1); break;
|
|
case 0xc012: IIeSwitchRead(language_card_.read); break;
|
|
case 0xc013: IIeSwitchRead(read_auxiliary_memory_); break;
|
|
case 0xc014: IIeSwitchRead(write_auxiliary_memory_); break;
|
|
case 0xc015: IIeSwitchRead(internal_CX_rom_); break;
|
|
case 0xc016: IIeSwitchRead(alternative_zero_page_); break;
|
|
case 0xc017: IIeSwitchRead(slot_C3_rom_); break;
|
|
case 0xc018: IIeSwitchRead(video_->get_80_store()); break;
|
|
case 0xc019: IIeSwitchRead(video_->get_is_vertical_blank(cycles_since_video_update_)); break;
|
|
case 0xc01a: IIeSwitchRead(video_->get_text()); break;
|
|
case 0xc01b: IIeSwitchRead(video_->get_mixed()); break;
|
|
case 0xc01c: IIeSwitchRead(video_->get_page2()); break;
|
|
case 0xc01d: IIeSwitchRead(video_->get_high_resolution()); break;
|
|
case 0xc01e: IIeSwitchRead(video_->get_alternative_character_set()); break;
|
|
case 0xc01f: IIeSwitchRead(video_->get_80_columns()); break;
|
|
#undef IIeSwitchRead
|
|
|
|
case 0xc07f:
|
|
if(is_iie()) *value = (*value & 0x7f) | (video_->get_double_high_resolution() ? 0x80 : 0x00);
|
|
break;
|
|
}
|
|
} else {
|
|
// Write-only switches. All IIe as currently implemented.
|
|
if(is_iie()) {
|
|
switch(address) {
|
|
default: break;
|
|
|
|
case 0xc000:
|
|
case 0xc001:
|
|
update_video();
|
|
video_->set_80_store(!!(address&1));
|
|
set_main_paging();
|
|
break;
|
|
|
|
case 0xc002:
|
|
case 0xc003:
|
|
read_auxiliary_memory_ = !!(address&1);
|
|
set_main_paging();
|
|
break;
|
|
|
|
case 0xc004:
|
|
case 0xc005:
|
|
write_auxiliary_memory_ = !!(address&1);
|
|
set_main_paging();
|
|
break;
|
|
|
|
case 0xc006:
|
|
case 0xc007:
|
|
internal_CX_rom_ = !!(address&1);
|
|
set_card_paging();
|
|
break;
|
|
|
|
case 0xc008:
|
|
case 0xc009:
|
|
// The alternative zero page setting affects both bank 0 and any RAM
|
|
// that's paged as though it were on a language card.
|
|
alternative_zero_page_ = !!(address&1);
|
|
set_zero_page_paging();
|
|
set_language_card_paging();
|
|
break;
|
|
|
|
case 0xc00a:
|
|
case 0xc00b:
|
|
slot_C3_rom_ = !!(address&1);
|
|
set_card_paging();
|
|
break;
|
|
|
|
case 0xc00c:
|
|
case 0xc00d:
|
|
update_video();
|
|
video_->set_80_columns(!!(address&1));
|
|
break;
|
|
|
|
case 0xc00e:
|
|
case 0xc00f:
|
|
update_video();
|
|
video_->set_alternative_character_set(!!(address&1));
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
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:
|
|
case 0xc051:
|
|
update_video();
|
|
video_->set_text(!!(address&1));
|
|
break;
|
|
case 0xc052: update_video(); video_->set_mixed(false); break;
|
|
case 0xc053: update_video(); video_->set_mixed(true); break;
|
|
case 0xc054:
|
|
case 0xc055:
|
|
update_video();
|
|
video_->set_page2(!!(address&1));
|
|
set_main_paging();
|
|
break;
|
|
case 0xc056:
|
|
case 0xc057:
|
|
update_video();
|
|
video_->set_high_resolution(!!(address&1));
|
|
set_main_paging();
|
|
break;
|
|
|
|
case 0xc05e:
|
|
case 0xc05f:
|
|
if(is_iie()) {
|
|
update_video();
|
|
video_->set_double_high_resolution(!(address&1));
|
|
}
|
|
break;
|
|
|
|
case 0xc010:
|
|
keyboard_input_ &= 0x7f;
|
|
if(string_serialiser_) {
|
|
if(!string_serialiser_->advance())
|
|
string_serialiser_.reset();
|
|
}
|
|
|
|
// On the IIe, reading C010 returns additional key info.
|
|
if(is_iie() && isReadOperation(operation)) {
|
|
*value = (key_is_down_ ? 0x80 : 0x00) | (keyboard_input_ & 0x7f);
|
|
}
|
|
break;
|
|
|
|
case 0xc030: case 0xc031: case 0xc032: case 0xc033: case 0xc034: case 0xc035: case 0xc036: case 0xc037:
|
|
case 0xc038: case 0xc039: case 0xc03a: case 0xc03b: case 0xc03c: case 0xc03d: case 0xc03e: case 0xc03f:
|
|
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;
|
|
|
|
// Apply whatever the net effect of all that is to the memory map.
|
|
set_language_card_paging();
|
|
break;
|
|
}
|
|
|
|
/*
|
|
Communication with cards follows.
|
|
*/
|
|
|
|
if(!read_pages_[address >> 8] && 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_[static_cast<size_t>(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 reset_all_keys() override {
|
|
open_apple_is_pressed_ = closed_apple_is_pressed_ = key_is_down_ = false;
|
|
}
|
|
|
|
void set_key_pressed(Key key, char value, bool is_pressed) override {
|
|
switch(key) {
|
|
default: break;
|
|
case Key::F12:
|
|
m6502_.set_reset_line(is_pressed);
|
|
return;
|
|
case Key::LeftOption:
|
|
open_apple_is_pressed_ = is_pressed;
|
|
return;
|
|
case Key::RightOption:
|
|
closed_apple_is_pressed_ = is_pressed;
|
|
return;
|
|
}
|
|
|
|
// If no ASCII value is supplied, look for a few special cases.
|
|
if(!value) {
|
|
switch(key) {
|
|
case Key::Left: value = 0x08; break;
|
|
case Key::Right: value = 0x15; break;
|
|
case Key::Down: value = 0x0a; break;
|
|
case Key::Up: value = 0x0b; break;
|
|
case Key::BackSpace: value = 0x7f; break;
|
|
default: return;
|
|
}
|
|
}
|
|
|
|
// Prior to the IIe, the keyboard could produce uppercase only.
|
|
if(!is_iie()) value = static_cast<char>(toupper(value));
|
|
|
|
if(is_pressed) {
|
|
keyboard_input_ = static_cast<uint8_t>(value | 0x80);
|
|
key_is_down_ = true;
|
|
} else {
|
|
if((keyboard_input_ & 0x7f) == value) {
|
|
key_is_down_ = false;
|
|
}
|
|
}
|
|
}
|
|
|
|
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: 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);
|
|
switch(appleii_target->model) {
|
|
default: return nullptr;
|
|
case Target::Model::II: return new ConcreteMachine<Target::Model::II>(*appleii_target, rom_fetcher);
|
|
case Target::Model::IIplus: return new ConcreteMachine<Target::Model::IIplus>(*appleii_target, rom_fetcher);
|
|
case Target::Model::IIe: return new ConcreteMachine<Target::Model::IIe>(*appleii_target, rom_fetcher);
|
|
case Target::Model::EnhancedIIe: return new ConcreteMachine<Target::Model::EnhancedIIe>(*appleii_target, rom_fetcher);
|
|
}
|
|
}
|
|
|
|
Machine::~Machine() {}
|