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59 lines
1.3 KiB
C++
59 lines
1.3 KiB
C++
//
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// BD500.hpp
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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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#ifndef BD500_hpp
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#define BD500_hpp
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#include "../../Components/1770/1770.hpp"
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#include "../../Activity/Observer.hpp"
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#include "DiskController.hpp"
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#include <array>
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#include <memory>
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namespace Oric {
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/*!
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Emulates a Byte Drive 500, at least to some extent. Very little is known about this interface,
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and I'm in possession of only a single disk image. So much of the below is community guesswork;
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see the thread at https://forum.defence-force.org/viewtopic.php?f=25&t=2055
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*/
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class BD500: public DiskController {
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public:
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BD500();
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void write(int address, uint8_t value);
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uint8_t read(int address);
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void run_for(const Cycles cycles);
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void set_activity_observer(Activity::Observer *observer);
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private:
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void set_head_load_request(bool head_load) final;
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bool is_loading_head_ = false;
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Activity::Observer *observer_ = nullptr;
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void access(int address);
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void set_head_loaded(bool loaded);
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bool enable_overlay_ram_ = false;
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bool disable_basic_rom_ = false;
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void select_paged_item() {
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PagedItem item = PagedItem::RAM;
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if(!enable_overlay_ram_) {
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item = disable_basic_rom_ ? PagedItem::DiskROM : PagedItem::BASIC;
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}
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set_paged_item(item);
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}
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};
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};
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#endif /* BD500_hpp */
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