87 lines
2.4 KiB
C++
87 lines
2.4 KiB
C++
// (C) 2024 by Folkert van Heusden
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// Released under MIT license
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// Some of the code is translated from Neil Webber's PDP11/70 emulator
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#pragma once
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#include "gen.h"
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#include <ArduinoJson.h>
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#include <atomic>
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#include <stdint.h>
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#include <stdio.h>
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#include <string>
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#include <vector>
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#include "disk_device.h"
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#include "disk_backend.h"
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#define RP06_CS1 0176700 // control register
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#define RP06_WC 0176702 // word count
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#define RP06_UBA 0176704 // UNIBUS address
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#define RP06_DA 0176706 // desired address
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#define RP06_CS2 0176710 // control/status register 2
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#define RP06_DS 0176712 // drive status
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#define RP06_ERRREG1 0176714 // error register 1
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#define RP06_AS 0176716 // unified attention status
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#define RP06_RMLA 0176720 // lookahead (sector under head!!)
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#define RP06_OFR 0176732 // heads offset
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#define RP06_DC 0176734 // desired cylinder
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#define RP06_CC 0176736 // "current cylinder" and/or holding register
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#define RP06_BAE 0176750 // address extension (pdp11/70 extra phys bits)
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#define RP06_BASE RP06_CS1
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#define RP06_END (RP06_BAE + 2)
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class bus;
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class rp06: public disk_device
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{
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private:
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bus *const b;
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uint16_t registers[32] { };
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std::atomic_bool *const disk_read_activity { nullptr };
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std::atomic_bool *const disk_write_activity { nullptr };
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int reg_num(uint16_t addr) const;
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uint32_t getphysaddr() const;
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uint32_t compute_offset() const;
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public:
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rp06(bus *const b, std::atomic_bool *const disk_read_activity, std::atomic_bool *const disk_write_activity);
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virtual ~rp06();
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void begin() override;
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void reset() override;
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void show_state(console *const cnsl) const override;
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JsonDocument serialize() const;
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static rp06 *deserialize(const JsonVariantConst j, bus *const b);
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uint8_t read_byte(const uint16_t addr) override;
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uint16_t read_word(const uint16_t addr) override;
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void write_byte(const uint16_t addr, const uint8_t v) override;
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void write_word(const uint16_t addr, const uint16_t v) override;
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enum class ds_bits {
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OFM = 0000001, // offset mode
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VV = 0000100, // volume valid
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DRY = 0000200, // drive ready
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DPR = 0000400, // drive present
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MOL = 0010000 // medium online
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};
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enum class cs1_bits {
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GO = 0000001, // GO bit
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FN = 0000076, // 5 bit function code - this is the mask
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IE = 0000100, // Interrupt enable
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RDY = 0000200, // Drive ready
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A16 = 0000400,
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A17 = 0001000,
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TRE = 0040000,
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};
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};
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