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From: Simon Wright <simon@pushface.org>
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Subject: Re: Ada Connections to this Crypto.
Date: Mon, 15 Dec 2014 16:17:17 +0000
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mrvmurray@gmail.com writes:

> Very many folks can do binary<->decimal conversion on their fingers,
> and binary<->hex conversions in their sleep.

People who programmed the Ferranti F1600 series of military computers
could count up to 31 on the fingers of one hand (the register-address
field in the instruction was 5 bits).