SWITCHING FUNCTIONS FOR SIMPLIFIED DATA RETRIEVAL AND DISPLAY DEVICES,
Abstract
Equivalence or inequality functions from the comparison logic of retrieval devices and require logical complements to be processed. Coding rules are described which permit subsets of these functions (which do not require complements) to act as the original functions. Savings in cost up to 50% may be realized. Electronic, optical, and mechanical forms of these concepts are possible. In particular, words of an associative or content-addressed memory may be organized into fields where the number of bits to encode each field is minimum. A display device which uses a deck of punched cards between a light source and a human observer to simulate combinational circuits with manual switch input and indicator output is described. Light from cells and fields of cells may be interpreted to correspond to the response of the first and second state respectively of circuits using AND, OR, NAND or NOR gates. This concept may be generalized to a class of devices where many parallel planes control the flow of electromagnetic waves through aligned apertures. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 01, 1963
- Accession Number
- AD0424796
Entities
People
- J. A. O'brien
Organizations
- MITRE Corporation