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82 lines
1.6 KiB
C++
82 lines
1.6 KiB
C++
//
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// i8272.hpp
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// Clock Signal
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//
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// Created by Thomas Harte on 05/08/2017.
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// Copyright © 2017 Thomas Harte. All rights reserved.
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//
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#ifndef i8272_hpp
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#define i8272_hpp
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#include "../../Storage/Disk/MFMDiskController.hpp"
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#include "../../Storage/Disk/Drive.hpp"
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#include <cstdint>
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#include <vector>
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namespace Intel {
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class i8272: public Storage::Disk::MFMController {
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public:
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i8272(Cycles clock_rate, int clock_rate_multiplier, int revolutions_per_minute);
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void run_for(Cycles);
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void set_register(int address, uint8_t value);
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uint8_t get_register(int address);
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void set_disk(std::shared_ptr<Storage::Disk::Disk> disk, int drive);
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private:
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void posit_event(int type);
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uint8_t main_status_;
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uint8_t status_[4];
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std::vector<uint8_t> command_;
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std::vector<uint8_t> result_stack_;
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enum class Event8272: int {
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CommandByte = (1 << 3),
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Timer = (1 << 4),
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ResultEmpty = (1 << 5),
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};
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int interesting_event_mask_;
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int resume_point_;
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int delay_time_;
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int step_rate_time_;
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int head_unload_time_;
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int head_load_time_;
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bool dma_mode_;
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struct Drive {
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uint8_t head_position;
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enum Phase {
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NotSeeking,
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Seeking,
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CompletedSeeking
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} phase;
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int step_rate_counter;
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int steps_taken;
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int target_head_position; // either an actual number, or -1 to indicate to step until track zero
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std::shared_ptr<Storage::Disk::Drive> drive;
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Drive() : head_position(0), phase(NotSeeking), drive(new Storage::Disk::Drive) {};
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} drives_[4];
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uint8_t header_[6];
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int distance_into_section_;
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int index_hole_limit_;
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uint8_t cylinder_, head_, sector_, size_;
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};
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}
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#endif /* i8272_hpp */
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