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Scan Instruction Disclosure Number: IPCOM000056078D
Original Publication Date: 1980-Oct-01
Included in the Prior Art Database: 2005-Feb-13

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Balm, GJ [+details]


A function found to be very useful in computer systems is to scan a string of characters searching for any of a prespecified set of special character codes while ignoring the nonspecified codes. In the past this function was performed by the Translate and Test (TRT) instruction. This instruction consisted of an operation code (opcode), an argument character string address and length, and a list (or table) address. It performed the desired function by scanning through the character string byte-by-byte, left-to-right. Each character string byte was individually used as an argument value to index into the list.