int e l 9.3 UNARY OPERATORS The next group of instructions perform an operation on the number that is on the TOP of the ARGUMENT STACK. If the TOP of the ARGUMENT STACK is represented by the symbol [TOS], then the following instructions would take the general form: [TOS] Where OP is one of the following operators: OPBYTE = 24 (18H) -- ABSOLUTE VALUE [TOS] OPBYTE = 25 (19H) -- INTEGER [TOS] OPBYTE = 26 (1AH) -- SIGN [TOS] 0 then [TOS] = 1, if [TOS] = 0 then [TOS] = 0, and if [TOS] then [TOS] = -1. OPBYTE = 27 (1BH) -- ONE'S COMPLEMENT [TOS] OPBYTE = 28 (1CH) -- COSINE OPERATOR [TOS] OPBYTE = 29 (1DH) -- TANGENT OPERATOR [TOS] 3*PI/2, 5*PI/2..... (2*N+1)*PI/2. - 113 -