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101 lines
2.0 KiB
C++
101 lines
2.0 KiB
C++
//
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// i8272.cpp
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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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#include "i8272.hpp"
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#include <cstdio>
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using namespace Intel;
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i8272::i8272(Cycles clock_rate, int clock_rate_multiplier, int revolutions_per_minute) :
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Storage::Disk::MFMController(clock_rate, clock_rate_multiplier, revolutions_per_minute) {
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}
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void i8272::run_for(Cycles cycles) {
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Storage::Disk::MFMController::run_for(cycles);
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}
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void i8272::set_register(int address, uint8_t value) {
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if(!address) return;
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// TODO: if not accepting commands, return
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command_.push_back(value);
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size_t necessary_length;
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switch(command_[0] & 0x1f) {
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case 0x06: // read data
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necessary_length = 9;
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break;
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case 0x0b: // read deleted data
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necessary_length = 9;
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break;
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case 0x05: // write data
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necessary_length = 9;
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break;
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case 0x09: // write deleted data
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necessary_length = 9;
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break;
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case 0x02: // read track
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necessary_length = 9;
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break;
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case 0x0a: // read ID
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necessary_length = 2;
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break;
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case 0x0d: // format track
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necessary_length = 6;
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break;
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case 0x11: // scan low
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necessary_length = 9;
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break;
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case 0x19: // scan low or equal
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necessary_length = 9;
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break;
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case 0x1d: // scan high or equal
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necessary_length = 9;
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break;
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case 0x07: // recalibrate
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necessary_length = 2;
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break;
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case 0x08: // sense interrupt status
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necessary_length = 1;
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break;
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case 0x03: // specify
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necessary_length = 3;
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break;
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case 0x04: // sense drive status
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necessary_length = 2;
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break;
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case 0x0f: // seek
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necessary_length = 3;
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break;
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default: // invalid
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necessary_length = 1;
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break;
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}
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printf("8272 set register %d to %02x\n", address, value);
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if(command_.size() == necessary_length) {
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printf("8272 Perform!\n");
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command_.clear();
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}
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}
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uint8_t i8272::get_register(int address) {
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if(address) {
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printf("8272 get data\n");
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return 0xff;
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} else {
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printf("8272 get status\n");
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return 0x80;
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}
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}
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void i8272::posit_event(Event type) {
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}
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