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147 lines
3.5 KiB
C++
147 lines
3.5 KiB
C++
//
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// BD500.cpp
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// Clock Signal
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//
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// Created by Thomas Harte on 14/01/2020.
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// Copyright © 2020 Thomas Harte. All rights reserved.
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//
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#include "BD500.hpp"
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using namespace Oric;
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BD500::BD500() : DiskController(P1793, 9000000) {
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disable_basic_rom_ = true;
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select_paged_item();
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set_is_double_density(true);
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}
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void BD500::write(int address, uint8_t value) {
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access(address);
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if(address >= 0x0320 && address <= 0x0323) {
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// if(address == 0x320) printf("Command %02x\n", value);
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WD::WD1770::write(address, value);
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}
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}
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uint8_t BD500::read(int address) {
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access(address);
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switch(address) {
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default: return 0xff;
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case 0x0320: case 0x0321: case 0x0322: case 0x0323:
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return WD::WD1770::read(address);
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case 0x312: return (get_data_request_line() ? 0x80 : 0x00) | (get_interrupt_request_line() ? 0x40 : 0x00);
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}
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}
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void BD500::access(int address) {
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// Determine whether to perform a command.
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switch(address) {
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case 0x0320: case 0x0321: case 0x0322: case 0x0323: case 0x0312:
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return;
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case 0x310: enable_overlay_ram_ = true; break;
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case 0x313: enable_overlay_ram_ = false; break;
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case 0x317: disable_basic_rom_ = false; break; // Could be 0x311.
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default:
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// printf("Switch %04x???\n", address);
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break;
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}
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select_paged_item();
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}
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/*
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The following was used when trying to find appropriate soft switch locations. It is preserved
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as the values I have above are unlikely to be wholly correct and further research might be
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desirable.
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void BD500::access(int address) {
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// 0,1,4,5,10,11 -> 64kb Atmos
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// 2,3,9 -> 56kb Atmos.
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// Broken: 6, 7, 8
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int order = 5;
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int commands[4];
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std::vector<int> available_commands = {0, 1, 2, 3};
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const int modulos[] = {6, 2, 1, 1};
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for(int c = 0; c < 4; ++c) {
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const int index = order / modulos[c];
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commands[c] = available_commands[size_t(index)];
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available_commands.erase(available_commands.begin() + index);
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order %= modulos[c];
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}
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// Determine whether to perform a command.
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int index = -1;
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switch(address) {
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case 0x0320: case 0x0321: case 0x0322: case 0x0323: case 0x0312:
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return;
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case 0x310: index = 0; break;
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case 0x313: index = 1; break;
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case 0x314: index = 2; break;
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case 0x317: index = 3; break;
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default:
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printf("Switch %04x???\n", address);
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break;
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}
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select_paged_item();
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if(index >= 0) {
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switch(commands[index]) {
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case 0: enable_overlay_ram_ = true; break; // +RAM
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case 1: disable_basic_rom_ = false; break; // -rom
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case 2: disable_basic_rom_ = true; break; // +rom
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case 3: enable_overlay_ram_ = false; break; // -RAM
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}
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select_paged_item();
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}
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}
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*/
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void BD500::set_head_load_request(bool head_load) {
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// Turn all motors on or off; if off then unload the head instantly.
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is_loading_head_ |= head_load;
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for(auto &drive : drives_) {
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if(drive) drive->set_motor_on(head_load);
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}
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if(!head_load) set_head_loaded(false);
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}
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void BD500::run_for(const Cycles cycles) {
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// If a head load is in progress and the selected drive is now ready,
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// declare head loaded.
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if(is_loading_head_ && drives_[selected_drive_] && drives_[selected_drive_]->get_is_ready()) {
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set_head_loaded(true);
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is_loading_head_ = false;
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}
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WD::WD1770::run_for(cycles);
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}
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void BD500::set_activity_observer(Activity::Observer *observer) {
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observer_ = observer;
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if(observer) {
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observer->register_led("BD-500");
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observer_->set_led_status("BD-500", get_head_loaded());
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}
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}
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void BD500::set_head_loaded(bool loaded) {
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WD::WD1770::set_head_loaded(loaded);
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if(observer_) {
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observer_->set_led_status("BD-500", loaded);
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}
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}
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