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