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A Number Representation Convertor for Magnetic Bubble String Comparators

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2 Author(s)
Bongiovanni, G. ; Università di Pisa, Istituto di Scienze dell''lnformazione, Italy ; Wong, C.K.

Conventionally, there are four common ways to represent negative numbers, namely, 1's-complement, 2's-complement, signed-magnitude, and excess-2m−1. In all these representations except the last one (excess-2m−1), 1 is used as the sign bit to denote negative numbers. However, in a recently reported magnetic bubble device, using 1 as the sign bit for negative numbers may cause problems when two numbers are compared. In this paper we define a new number representation (called B1's-complement), and we propose a simple, read-free device for converting numbers represented in any of the above standard representations to either the excess-2m−1 or the B1's-complement representation.

Note: The Institute of Electrical and Electronics Engineers, Incorporated is distributing this Article with permission of the International Business Machines Corporation (IBM) who is the exclusive owner. The recipient of this Article may not assign, sublicense, lease, rent or otherwise transfer, reproduce, prepare derivative works, publicly display or perform, or distribute the Article.  

Published in:

IBM Journal of Research and Development  (Volume:25 ,  Issue: 1 )