Path: csiph.com!v102.xanadu-bbs.net!xanadu-bbs.net!feeder.erje.net!us.feeder.erje.net!xmission!news.bbs-scene.org!macgui.com!mmphosis
From: mmphosis <mmphosis@macgui.com>
Newsgroups: comp.sys.apple2.programmer
Subject: Re: S16, OMF and Segments
Date: Sat, 5 Apr 2014 17:11:14 +0000 (UTC)
Organization: Mac GUI
Lines: 15
Message-ID: <mmphosis-1396717872@macgui.com>
References: <25ce127b-ac26-4a8f-80ed-7cddbec7435d@googlegroups.com>
NNTP-Posting-Host: gunshin.wiredns.net
Mime-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
X-Trace: technocratmedia-w1.news.bbs-scene.org 1396717874 30455 74.119.145.48 (5 Apr 2014 17:11:14 GMT)
X-Complaints-To: abuse@bbs-scene.org
NNTP-Posting-Date: Sat, 5 Apr 2014 17:11:14 +0000 (UTC)
User-Agent: Mac GUI Usenet
In-Reply-To: <25ce127b-ac26-4a8f-80ed-7cddbec7435d@googlegroups.com>
Xref: csiph.com comp.sys.apple2.programmer:1203

Programming the 65816 by David Eyes/Ron Lichty

The 65816 has instructions to access 24 bits of memory at a time:  the
entire 16 Mb (16777216 bytes) of memory are available.  JMP to a 24 bit
address, load a 24 bit address, store to a 24 bit address.  There is a
"bank" register that adds that extra 8 bits to the 16 bit address space.

<rant>I remember from the x86 world and the 680x0 world back then it was the
tools and some of the earlier processors that set these seemingly arbitrary
low limits on the address space.  32k text sizes, and 32K branch islands on
the Mac, and the horrors of segmented memory on the PC.  I would stay away
from the idea of "segmented" memory and look at the entire big flat memory
space.</rant>