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- Newsgroups: comp.sys.amiga.hardware
- Path: sparky!uunet!zaphod.mps.ohio-state.edu!magnus.acs.ohio-state.edu!dcantrel
- From: dcantrel@magnus.acs.ohio-state.edu (Daniel T Cantrell)
- Subject: Re: Adding memory to spite the OS
- Message-ID: <1993Jan24.063744.22888@magnus.acs.ohio-state.edu>
- Summary: No, no, no....
- Sender: news@magnus.acs.ohio-state.edu
- Nntp-Posting-Host: magnusug.magnus.acs.ohio-state.edu
- Organization: The Ohio State University
- References: <1993Jan22.005816.26906@cheshire.oxy.edu> <1993Jan22.175057.22620@enea.se>
- Date: Sun, 24 Jan 1993 06:37:44 GMT
- Lines: 17
-
- khan@cheshire.oxy.edu (Onnie Lynn Winebarger) writes:
- > Hi guys. I have a question concerning some limitations of the OS
- > concerning RAM expansion. As I understand it, the OS was designed with
- > the 68000 in mind, and its address space as well, so the limited the size
- > of addressable RAM to 9 MB, with the rest marked for various devices and
- > such.
-
- Perhaps you have confused it with a Macintosh. The Amiga OS was designed
- from the start to be 32-bit pure. Every RKM has always expounded to program-
- mers the importance of not messing with the upper byte of addresses. Which
- is not to say that programmers were always listening.. In any case, every
- AmigaDOS since 1.2 has been able to run on an accelerated machine. What you
- are thinking of are HARDWARE limitations. The 68000 has only 24 physical ad-
- dress pins, limiting the available address space to 16M. 10M of this is al-
- located to memory, 2M chip and 8M fast. But a more advanced processor gives
- you the ability to address more physical memory.
-
-