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38 lines
1.0 KiB
C++
38 lines
1.0 KiB
C++
//
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// SonyDrive.cpp
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// Clock Signal
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//
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// Created by Thomas Harte on 04/06/2019.
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// Copyright © 2019 Thomas Harte. All rights reserved.
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//
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#include "SonyDrive.hpp"
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using namespace Apple::Macintosh;
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SonyDrive::SonyDrive(int input_clock_rate, bool is_800k) :
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Storage::Disk::Drive(static_cast<unsigned int>(input_clock_rate), is_800k ? 2 : 1), is_800k_(is_800k) {
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// Start with a valid rotation speed.
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if(is_800k) {
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set_rotation_speed(393.3807f);
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}
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}
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void SonyDrive::did_step(Storage::Disk::HeadPosition to_position) {
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// The 800kb drive automatically selects rotation speed as a function of
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// head position; the 400kb drive doesn't do so.
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if(is_800k_) {
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/*
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Numbers below cribbed from the Kryoflux forums.
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*/
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const int zone = to_position.as_int() >> 4;
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switch(zone) {
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case 0: set_rotation_speed(393.3807f); break;
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case 1: set_rotation_speed(429.1723f); break;
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case 2: set_rotation_speed(472.1435f); break;
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case 3: set_rotation_speed(524.5672f); break;
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default: set_rotation_speed(590.1098f); break;
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}
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}
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}
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