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- Newsgroups: comp.sys.amiga.applications
- Path: sparky!uunet!usc!cheshire.oxy.edu!leavitt
- From: leavitt@cheshire.oxy.edu (Thomas VanNess Leavitt)
- Subject: Virtual Memory for the Amiga?
- Message-ID: <1992Jul24.100519.617@cheshire.oxy.edu>
- Organization: Occidental College, Los Angeles, CA 90041 USA.
- Date: Fri, 24 Jul 1992 10:05:19 GMT
- Lines: 55
-
- From: jayson@tbag.UUCP (Jayson Phillips)
- Newsgroups: comp.sys.amiga.hardware
- Subject: Virtual Memory found for Amiga
- Date: 30 Apr 92 04:08:03 EST
-
-
- >From: dridi@choco.UUCP (Gilles Dridi ERF004)
- >Subject: Re: Virtual Memory found for Amiga
- >Date: 22 Apr 92 16:35:32 GMT
- >
- >>sjc28473@uxa.cso.uiuc.edu (Steven Joseph Chmura) writes:
- >>
- >>I spotted this announcement in the readme file for mmux32 on ab20:
- >>
- >>Available by Feb, 1992:
- >> AVM - the Amiga Virtual Memory by F. Buergel and C. Schneider
- >> At last - the benefits of virtual memory for existing software
- >> like AdPro, CygnusEd, Imagine, etc
- >> Hardware independent and 100% multitasking!
- >> ...
- >>It detects acess to paged-out memory by marking memory
- >>as 'invalid'.
- >>Yours sincerely
- >>Friedemann U. Buergel
- >
- > Can someone explain what does this program do ?
- > Does it use MMU on 68030 system ?
- > Or is it a joke ?
- >
- >--
- >{cbmvax!cbmehq}!cbmfra!choco!dridi
-
- OK let's get one thing straight here. The MMU stands for Memory Management
- Unit. It doesn't (necassarily) have anything to do with virtual memory. It
- supports what is known as Hardware Memory Protection, or memory translation.
- That is, or course, memory management. In the 68K series of CPU's the
- Vector Base Register is used to support virtual memory in the following:
- 68010, 68020, 68030, 68040. The 68000 and 68008 do not have the Vector Base
- Register. I'm not sure, but possibly virtual memory can be implemented on
- the 68000 with some nifty software. In any case, the MMU is not necassary.
- All 68K CPU's above the 68000 can support virtual memory.
-
- _ _ _ _ _
- Jay Phillips /\ |\/| | / _ /\ _) / \ / \ / \ 68030/68882-25MHz
- Tampa FL USA /--\ | | | \_/ /--\ _) \_/ \_/ \_/ 6MB-RAM Q105-HD
- -------------------------------------------------------------------
- NET: tbag!jayson@uunet.uu.net GENIE: B.Phillips13
- -------------------------------------------------------------------
-
- -------------
-
- Is this program actually available? In use? Any comments?
-
- Thom
-
-