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加三码.
加三码(Excess-3/XS-3)是一种二进码十进数,也叫Stibitz code[1],是一种互补BCD码和记数系统。
XS-3 用于一些老式计算机上和寄存器上,以及上世纪 70 年代的手持便携电子计算器中。XS-3 用预先指定的数字N
作为偏重值(biased value)来表示数值,非加权(nonweighted)。此类并称 XS-N
。在 XS-3 中,每位数字表示为该位原数值加三的四位(bit)二进制数。亦即,XS-3 等同于十进制数自身加三,再转化为二进制形式。
- 例如得到十进制的
4
的 XS-3 表达,4+3=7
,其二进制表达即为 XS-3。0111
即是。[2]
Decimal
|
Binary
|
Decimal
|
Binary
|
Decimal
|
Binary
|
Decimal
|
Binary
|
−3
|
0000
|
1
|
0100
|
5
|
1000
|
9
|
1100
|
−2
|
0001
|
2
|
0101
|
6
|
1001
|
10
|
1101
|
−1
|
0010
|
3
|
0110
|
7
|
1010
|
11
|
1110
|
0
|
0011
|
4
|
0111
|
8
|
1011
|
12
|
1111
|
- ^ 美国名人堂-Stibitz. [2013-04-23]. (原始内容存档于2018-10-02).
- ^ Excess-3 code in digital electronics.. [2013-04-23]. (原始内容存档于2019-09-21).
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