Path: utzoo!attcan!uunet!tut.cis.ohio-state.edu!zaphod.mps.ohio-state.edu!sol.ctr.columbia.edu!emory!mephisto!udel!haven!adm!smoke!gwyn
From: gwyn@smoke.BRL.MIL (Doug Gwyn)
Newsgroups: comp.sys.apple2
Subject: Re: DMA (Memory capacity)
Message-ID: <13020@smoke.BRL.MIL>
Date: 30 May 90 12:17:09 GMT
References: <5517.apple.net@pro-angmar>
Organization: U.S. Army Ballistic Research Laboratory, APG, MD.
Lines: 8

In article <5517.apple.net@pro-angmar> m.tiernan@pro-angmar.UUCP (Michael Tiernan) writes:
>The 65816 can address 16Megs but the memory slot is intended to address only
>8Mb.  The other 8Megs was intended to be a ROM card that got plugged into it.

Quite wrong -- the upper 8MB of the address space is in fact used in
the Apple IIGS, for the firmware among other things, and a portion of
it is accessible via the memory expansion slot.  There are memory
cards that do support adding ROM in that memory space.