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From: George Neuner <gneuner2@comcast.net>
Newsgroups: comp.arch
Subject: Re: Stealing a Great Idea from the 6600
Date: Mon, 22 Apr 2024 23:09:43 -0400
Organization: i2pn2 (i2pn.org)
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On Sun, 21 Apr 2024 00:43:21 +0000, mitchalsup@aol.com (MitchAlsup1)
wrote:

>Address arithmetic is ADD only and does not care about signs or
>overflow. There is no concept of a negative base register or a
>negative index register (or, for that matter, a negative displace-
>ment), overflow, underflow, carry, ...

Stack frame pointers often point to the middle of the frame and need
to access data using both positive and negative displacements.

Some GC schemes use negative displacements to access object headers.