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38 lines
1.4 KiB
C++
38 lines
1.4 KiB
C++
//
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// Constants.hpp
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// Clock Signal
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//
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// Created by Thomas Harte on 24/09/2017.
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// Copyright © 2017 Thomas Harte. All rights reserved.
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//
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#ifndef Constants_h
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#define Constants_h
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namespace Storage {
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namespace Encodings {
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namespace MFM {
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const uint8_t IndexAddressByte = 0xfc;
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const uint8_t IDAddressByte = 0xfe;
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const uint8_t DataAddressByte = 0xfb;
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const uint8_t DeletedDataAddressByte = 0xf8;
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const uint16_t FMIndexAddressMark = 0xf77a; // data 0xfc, with clock 0xd7 => 1111 1100 with clock 1101 0111 => 1111 0111 0111 1010
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const uint16_t FMIDAddressMark = 0xf57e; // data 0xfe, with clock 0xc7 => 1111 1110 with clock 1100 0111 => 1111 0101 0111 1110
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const uint16_t FMDataAddressMark = 0xf56f; // data 0xfb, with clock 0xc7 => 1111 1011 with clock 1100 0111 => 1111 0101 0110 1111
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const uint16_t FMDeletedDataAddressMark = 0xf56a; // data 0xf8, with clock 0xc7 => 1111 1000 with clock 1100 0111 => 1111 0101 0110 1010
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const uint16_t MFMIndexSync = 0x5224; // data 0xc2, with a missing clock at 0x0080 => 0101 0010 1010 0100 without 1000 0000
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const uint16_t MFMSync = 0x4489; // data 0xa1, with a missing clock at 0x0020 => 0100 0100 1010 1001 without 0010 0000
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const uint16_t MFMPostSyncCRCValue = 0xcdb4; // the value the CRC generator should have after encountering three 0xa1s
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const uint8_t MFMIndexSyncByteValue = 0xc2;
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const uint8_t MFMSyncByteValue = 0xa1;
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}
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}
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}
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#endif /* Constants_h */
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