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Code 128 supports all ASCII characters (0-127)

Code 128A supports uppercase letters, numbers, and control codes

Code 128B supports all standard ASCII characters (32-127)

Code 128C requires an even number of digits (numeric only)

UPC-A code values must contain 11 digits (without checksum digit)

UPC-E code values must contain 6 digits (compressed from UPC-A)

EAN-13 code values must contain 12 digits (without checksum digit)

EAN-8 code values must contain 7 digits (without checksum digit)

EAN-5 code values must contain exactly 5 digits

EAN-2 code values must contain exactly 2 digits

Code 39 supports uppercase letters, numbers, and special characters (-, ., $, /, +, %, and space)

ITF requires an even number of digits (numeric only)

ITF-14 code values must contain 13 digits (without checksum digit)

MSI accepts numeric digits only (0-9)