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squeeze, or un-squash an archive.
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If your application requires a large number of graphics
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screens, or a great deal of text you could cram at least
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twice as much information on a disk using random access
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archives!
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ARC VERSION 2.20 PAGE - 50
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Choosing the Compressor Manually
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ARC now lets you choose the method of storage yourself.
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The most useful option is when you opt to crunch all files
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in a single pass. If disk storage is a consideration, then
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the following rules of thumb can be used to decide when to
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choose this option and when to avoid it.
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If you let ARC choose the most efficient compressor,
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then you will find that:
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1) Text files almost always CRUNCH.
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2) Word Pro or Paperclip files almost always CRUNCH.
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3) BASIC programs almost always CRUNCH.
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4) Machine language programs less than 40 blocks will
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usually CRUNCH and sometimes SQUASH.
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5) Larger ML programs usually SQUASH and occasionally
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SQUEEZE or PACK.
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6) Graphics images either CRUNCH or SQUASH (50:50)
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and occasionally PACK
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At present there is no version of ARC for Commodore
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computers other than the 64. Eventually there will be at
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least a program that will extract archives on a PET, VIC or
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what have you. The CRUNCH routines require a large amount of
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RAM memory (about 32K or more), so if you are archiving
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material for a PET or VIC or any other machine that has less
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than 32K RAM, you should avoid CRUNCHing files.
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INTRODUCTION 2
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Freeware 2
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Disclaimer 4
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Updates 5
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Version numbers 6
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Bugs in ARC 7
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Intro to ARC 8
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Drive letters 10
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General DOS commands 12
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Set default drive 12
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Execute program 12
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Set date 12
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Viewing a disk directory 13
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Scratching files 13
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Moving files between drives 14
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Renaming files 14
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Viewing a file's contents 14
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DOS wedge 15
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Size 15
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Start 15
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editor commands. 16
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selecting text or BASIC mode. 16
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Automatic line numbering 16
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RESET the computer. 16
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Change 17
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Delete lines 17
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Find text 17
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Load sequential file 17
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Disable ARC 18
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Renumber lines 18
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Save Sequential file 18
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Repeat/Off 18
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Un-NEW 18
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Hex to Decimal conversions 18
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ARC 19
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Creating Archives 19
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Appending to existing archives 21
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Notes on XMODEM 21
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Extracting files from an archive 23
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Archive directories 24
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Typing a file in an archive 25
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Printer setup 25
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Verifying an archive 26
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MEMORY MAP 27
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THEORY OF OPERATION 28
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Run length coding (packing) 28
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Huffman coding (squeezing) 30
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Squeeze example 32
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Lempel Zev Compression (crunching) 35
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Crunch example 35
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Archive file format 38
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The header 38
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Stored Files 38
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Packed Files 38
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Squeezed or Squashed Files 39
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