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95 lines
2.0 KiB
C++
95 lines
2.0 KiB
C++
//
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// Macintosh.cpp
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// Clock Signal
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//
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// Created by Thomas Harte on 03/05/2019.
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// Copyright © 2019 Thomas Harte. All rights reserved.
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//
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#include "Macintosh.hpp"
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#include "Video.hpp"
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#include "../../CRTMachine.hpp"
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#include "../../../Processors/68000/68000.hpp"
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#include "../../../Components/6522/6522.hpp"
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#include "../../Utility/MemoryPacker.hpp"
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namespace Apple {
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namespace Macintosh {
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class ConcreteMachine:
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public Machine,
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public CRTMachine::Machine,
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public CPU::MC68000::BusHandler {
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public:
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ConcreteMachine(const ROMMachine::ROMFetcher &rom_fetcher) :
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mc68000_(*this),
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video_(ram_),
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via_(via_port_handler_) {
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// Grab a copy of the ROM and convert it into big-endian data.
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const auto roms = rom_fetcher("Macintosh", { "mac128k.rom" });
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if(!roms[0]) {
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throw ROMMachine::Error::MissingROMs;
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}
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roms[0]->resize(64*1024);
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Memory::PackBigEndian16(*roms[0], rom_);
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// The Mac runs at 7.8336mHz.
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set_clock_rate(7833600.0);
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}
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void set_scan_target(Outputs::Display::ScanTarget *scan_target) override {
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video_.set_scan_target(scan_target);
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}
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Outputs::Speaker::Speaker *get_speaker() override {
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return nullptr;
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}
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void run_for(const Cycles cycles) override {
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mc68000_.run_for(cycles);
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}
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HalfCycles perform_bus_operation(const CPU::MC68000::Microcycle &cycle, int is_supervisor) {
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via_.run_for(cycle.length);
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// TODO: the entirety of dealing with this cycle.
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return HalfCycles(0);
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}
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/*
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Notes to self: accesses to the VIA are via the 68000's
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synchronous bus.
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*/
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private:
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class VIAPortHandler: public MOS::MOS6522::PortHandler {
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};
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CPU::MC68000::Processor<ConcreteMachine, true> mc68000_;
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Video video_;
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MOS::MOS6522::MOS6522<VIAPortHandler> via_;
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VIAPortHandler via_port_handler_;
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uint16_t rom_[32*1024];
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uint16_t ram_[64*1024];
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};
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}
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}
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using namespace Apple::Macintosh;
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Machine *Machine::Macintosh(const Analyser::Static::Target *target, const ROMMachine::ROMFetcher &rom_fetcher) {
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return new ConcreteMachine(rom_fetcher);
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}
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Machine::~Machine() {}
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