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QuoteRef: edgaAD3_1979
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Topic:
FOCUS number system
Reference
Edgar, A.D., Lee, S.C., "FOCUS microcomputer number system", Communications of the ACM, 22, 3, pp. 166-177, March 1979. Google
Notes
Edgar, A.D. & S.C. Lee, School of Elec. Engin. and Comp. Sci, Univ. of OK, 202 W. Boyd, Norman OK 73019
167 ;;Quote: FOCUS use logarithmic numbers with fractional exponents and no mantissa
167 ;;Quote: 8-bit FOCUS numbers nearly represent the range covered by 16-bit fixed point words
167 ;;Quote: 8-bit FOCUS executes 5 times faster than an uniform mixture of add, subtract, multiple, and divide
167 ;;Quote: 16-bit FOCUS routines run faster than 8-bit fixed point; similar to 18-bit floating point
168 ;;Quote: FOCUS addition and subtraction uses a lookup table; 2K for 16-bit system
172 ;;Quote: FOCUS does not have a zero, but this is not needed in control systems except for counting
175 ;;Quote: in FOCUS, multiplication and division are fastest and invoke no roundoff error; by a constant is one instruction
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