EAN-13	9780807218594
Product Name	Milkweed
Category	Book / Magazine / Publication
Amazon.com	Buy on Amazon ~ 0807218596
SKU	100216763
Price New	494.85 US Dollars    (curriencies)
Price Used	3.95 US Dollars    (curriencies)
Long Description	2003 RANDOM HOUSE AUDIO set of 3 UNABRIDGED AUDIO CASSETTES
Created	11-15-2012 9:05:54am
Modified	12-23-2013 10:08:02am
MD5	acde6df54c19006c6653a8137816bb51
SHA256	5d396e1a3c222ff7cd9c224cfe5d1f6deccd7061a29ed62adec61a78f77593a1
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Article of interest

Code 128 is a high-density 1D barcode symbology. This barcode set makes use of the entire 128 ASCII characters which include letter, number and symbols.

As with all barcodes, there are indicators to identify where the barcode starts and stops. These are marked in yellow below. Code 128 also has a check character which has been marked in green. The remainder of the barcode is the data being encoded. The text below the barcode is optional and is for human consumption in the event the barcode can't be scanned or if people also need to know what the code means.

Each character in the barcode symbol is composed of three bars and three spaces. Each bar or space must range from 1-4 units and the sum of all the width of all bars must work out to an even number. The stop marker is special because it adds an extra bar of 2 units at the very end (4 bars and 3 spaces). There are three different start markers to to identify which code set is being used. To represent all 128 characters, the code sets can be within a single barcode as needed by using control characters 98-101 (depending on the code set).

The check character is calculated by summing the value of each character and multiplying it by its position. The start character is also part of the sum but is added without weight (multiply by 1 just like the first encoded data character) then when you have the sum take the modulo 103 remainder. This gets a little more complex when mixing modes within a single barcode.