Trivia

Subject:
Before the 704

Bill Earl
>The encoding was very similar to a chinese abacus. Each decimal digit was represented by 7 bits. 2 of the bits had a value of 5 and the remaining 5 had a value of 1. Valid encodings consisted of exactly one bit from each set.

Decimal digits were represented as follows:

0 = 10-10000
1 = 10-01000
2 = 10-00100
3 = 10-00010
4 = 10-00001
5 = 01-10000
6 = 01-01000
7 = 01-00100
8 = 01-00010
9 = 01-00001

Apparantly, Univac used a variant of this encoding on a couple of early models as well.

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