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From: Lawrence D'Oliveiro <ldo@nz.invalid>
Newsgroups: comp.arch
Subject: Re: Byte Addressability And Beyond
Date: Mon, 6 May 2024 02:34:48 -0000 (UTC)
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On Sun, 05 May 2024 11:20:02 -0600, John Savard wrote:

> If you have decimal arithmetic, there's a direct connection between how
> numbers are represented for reading and writing, and how they are
> represented for internal arithmetic.

It is easier to do addition/subtraction if you start from the least 
significant end and propagate the carry/borrow along.

I believe those early IBM character machines worked exactly this way.