| 释义 |
octal, a. and n.|ˈɒktəl|
[f. oct- + -al.]
A. adj.
1. Electronics. Applied to valve bases and plugs (and the corresponding sockets) having a standard circular arrangement of eight pins with a central moulded key for determining the orientation.
1936Wireless World 20 Nov. 557 (heading) 8-pin base (octal) connections. 1943C. L. Boltz Basic Radio x. 165 Then from America came the international octal base, with eight pins symmetrically arranged in a circle. 1961Engineering 14 July 42/4 The unit is constructed as a plug-in module..connecting with associated circuits through a standard octal plug. 1976Gramophone Feb. 1403/1 At the left is an octal valve socket designed for use with a matching transformer when a moving coil cartridge is used.
2. Math. and Computers. Pertaining to or being a system of numerical notation that employs 8 rather than 10 as the base.
1948Math. Tables & Other Aids to Computation III. 295 Binary numbers are set into the keyboard in the octal (radix 8) notation. 1962T. C. Bartee et al. Theory & Design Digital Machines 307 In the octal system the sequence 624 represents the sum 6 × 82 + 2 × 81 + 4 × 80 which is equal to the sequence 404 in the decimal system. 1963Rep. Comm. Inquiry Decimal Currency 4 in Parl. Papers 1962–3 (Cmnd. 2145) XI. 195 If..we have in mind electronic rather than human computers, a case can be made for counting in eights—an octal system—because this can be related more easily to the binary system used by such computers. 1973Nature 27 Apr. 620/1 The octal system is widely used in listing machine instruction programs for small computers, where groups of six octal digits are written in place of sixteen to eighteen binary digits.
B. n. The octal system; rarely pl.
1948Math. Tables & Other Aids to Computation III. 295 The conversions octal-binary and binary-octal are very elementary. 1961Evans & Perry Programming & Coding iii. 89 The two representations ·101010101 in binary, and ·525 in octal, are different representations of the same magnitude. 1961Times 28 Dec. 9/5 (heading) Thinking in octals. Advantages over decimals. 1967Klerer & Korn Digital Computer User's Handbk. i. ii. 39 Since 23 = 81, a binary series of digits may be converted to octal by grouping the binary digits into three to left or right of the decimal point. Thus the binary integer (1001011011)2 = (1 001 011 011)2 = (1133)8. 1977D. Bagley Enemy xxxi. 253 This gadget is working in octal instead of decimal... Many computers work in octal internally. |