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- Path: pacbell.com!well!jeremyn
- From: jeremyn@well.sf.ca.us (Jeremy Nixon)
- Newsgroups: comp.sys.amiga.hardware
- Subject: Re: A500 memory limitations?
- Date: 2 Apr 1996 07:15:44 GMT
- Organization: The Whole Earth 'Lectronic Link, Sausalito, CA
- Message-ID: <4jqk71$84n@nkosi.well.com>
- References: <4jf5hk$sr6@dfw-ixnews6.ix.netcom.com> <4jk66i$oeu@nkosi.well.com> <4jmguu$8tm@reader2.ix.netcom.com>
- NNTP-Posting-Host: well.com
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-
- Mark & Michelle Wood (bamf13@ix.netcom.com) wrote:
- : In <4jk66i$oeu@nkosi.well.com> jeremyn@well.sf.ca.us (Jeremy Nixon)
- : writes:
-
- : >In 68000 mode your limit is 8 megs fast, 2 megs chip. However, it all
- : has
- : >to be 16-bit RAM, mapped into the right place. Your 32-bit RAM on the
- : >68030 is probably (hopefully) mapped above that address space and thus
- : >can't be accessed in 68000 mode.
-
- : Thanks for your reply. How can I tell where it is mapped, what is the
- : right place for it, and how do I 'map' it elsewhere if needed?
-
- You don't. Just about all 32-bit accellerator RAM will be mapped above
- the 16-bit address space so as not to cause conflict. I say "just about"
- because I haven't looked at every single accellerator board out there and
- thus don't want to make a sweeping statement.
-
- If you really want to see where the memory is, you can use a program such
- as Scout or SysInfo, but what you'll get will be hex numbers that
- probably won't mean a whole lot to you.
-
- : >Switching to 68000 mode won't cause a problem, you just won't have any
- : >memory beyond the 68000's address space. My A500 has a total of 18
- : megs,
- : >2 megs chip plus 16 megs 32-bit fast on my 030. If I boot in 68000
- : mode,
- : >I only get the 2 megs chip RAM.
-
- : So even if it's mapped low it will be okay?
-
- Should be okay, but it almost certainly won't be "mapped low". But you
- still won't get it in 68000 mode, regardless. You can only use 16-bit RAM
- with the 68000.
-
- Jeremy
- jeremyn@injersey.com
- jeremyn@well.com
-
-