UNIVAC 1100 machines used one's complement representation of negative numbers, as opposed to the two's complement form almost universal today. In one's complement, where zero is a signed number, you have not only zero, but minus zero to contend with. This document explores various representations of negative numbers and describes some of the bizarre consequences and applications of minus zero. Most computers today use two's complement representation for negative integer numbers. The UNIVAC® 1100 family, however, used one's complement. dies fuehrt zu einem negativen 0. die operationen dazu lauten: Minus Zero Logic +0 + +0 = +0 +0 + -0 = +0 -0 + +0 = +0 -0 + -0 = -0 +0 - +0 = +0 +0 - -0 = +0 -0 - +0 = -0 -0 - -0 = +0 das einerkomplement hat auf hardwareebene den vorteil, dass es einige transistoren / elementarentscheidungen weniger benoetigt um das vorzeichen jederzeit evaluieren zu koennen. den ganzen technischen artikel findet ihr auf: http://www.fourmilab.ch/documents/univac/minuszero. html mahal -- = -- -- = -- -- = -- a n a . w o r d s aus dem hellblauen salon words@ana.ch http://ana.ch/words/ ana.txt seite 444 reicht ana.words weiter! _____________ ________________________ ______________________________ ____________________________________ ________________________________________ _____________________ __________________ ____________________ ___________________ ______________________ ___________________ ______________________ _____________________ ____________________ ____________________ ______________________ __ _____________ ____________ _______ _________ ___________ _______ ______________ ______ _________________ ______ ________ ____________________ _____________________ ______________________ ____________________ ___ ________________________ ____________________ ______ ________________________ __________________ _______ __ _______________________ __________________ ________ ___ ________________________ ____________________ ______ _ ________________________ ______________________ ____ __________________________ _________________________ __ ____________________________ _____________________________ ____________________________ _______________________________ ____________________________ _______________________________ ____________________________ _______________________________ ___________________________ _______________________________ ___________________________ _______________________________ ___________________________ ______________________________ ___________________________ _____________________________ ___________________________ ____________________________ ____________________________ ____________________________ _ ___________________________ ____________________________ __ ___________________________ ___________________________ ____ ___________________________ ___________________________ _____ ___________________________ __________________________ _______ ___________________________ _________________________ ______ __________________________ ________________________ ________ __________________________ ______________________ __ __________ ___________________________ ______________________ _ _________ __ ________________________ ___________________ ___________ ________________________ ___________________ ___________ ______________________ __________________ _____________ _____________________ _________________ _____________ ____________________ ______________ ______________ ___________________ _____________ _______________ __________________ ____________ ________________ ________________ __________ ______________ _____________ ________ ______________ _________ _______ _____________________ ____ ______ ____________________________ _______________________________ ________________________ ______________ best viewed in a fixed-width font such as monaco or courier
