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- Newsgroups: comp.sys.amiga.hardware
- Path: sparky!uunet!usc!cheshire.oxy.edu!khan
- From: khan@cheshire.oxy.edu (Onnie Lynn Winebarger)
- Subject: Re: Adding memory to spite the OS
- Message-ID: <1993Jan22.100522.18234@cheshire.oxy.edu>
- Keywords: 68030, bigger address space, more RAM
- Organization: Occidental College, Los Angeles, CA 90041 USA.
- References: <1993Jan22.005816.26906@cheshire.oxy.edu> <jmarin.727689424@messi.uku.fi>
- Date: Fri, 22 Jan 1993 10:05:22 GMT
- Lines: 48
-
- In article <jmarin.727689424@messi.uku.fi> jmarin@messi.uku.fi (Jukka Marin) writes:
- >
- >Well, the Amiga was designed by intelligent people and there is no limit
- >for adding memory in the OS itself. The 9-meg limit comes from the 68000
- >itself and there's no such limit in 68020/030/040 which can address 4Gbytes
- >instead of 16MBytes.
- >
- That's good, then. It merely seemed as though many people had referred
- to 8 megs as a OS imposed limit, but I guess they were just referring to
- the most common system sold
-
- >
- >You can only have 8MB of FAST RAM in the Zorro II autoconfig area, ie.
- >the area that can be accessed by 68000 and Zorro II expansion boards.
- >You can have any amount of RAM above the 16-meg space if your accelerator
- >allows for it. Some accelerators place their RAM in the 16-megs space,
- >so any other device connected to the CPU bus can directly access that
- >RAM (like hard disk interfaces etc). Some accelerators place their RAM
- >above the 16-meg boundary and if that is the case with your board, you
- >can still have another 8 MBytes of 'normal' FAST RAM in your machine.
- >
- >Having 16-bit (below 16MB) FAST RAM on an accelerated machine isn't all
- >that wise, though.. The 32-bit CPU's slow down to 68000's speed or below
- >when they have to access slow 16-bit memory.
- >
- Well, this is very interesting. GVP (at the moment) provides no way
- for A530 owners to have more than 8 megabytes of (32-bit) RAM. Of course,
- if the 68030's not active, neither the hard drive nor RAM is on either (for
- the GVP A530 Turbo, anyway). According to the manual, the 32-bit RAM is
- in the autoconfig area.
- If anybody at GVP's happens to be reading this, I am wondering if there
- are any plans to support more than 8 megs of RAM (a waste of 4 gigabytes of
- possible RAM. This is too much for me. I may not be able to afford much
- RAM, but I'd like to know that I could use it if I had it!)
-
-
- >
- > Jukka Marin
- >
- >--
- >| Mail: Jukka Marin | E-Mail: jmarin@messi.uku.fi |
- >| Metsurintie 17 B 8 | FAX/voice: +358 71 232 793 |
- >| 70150 Kuopio | There's God above computers - |
- >| FINLAND | Love beyond the hate |
-
- Thanks for the info,
- Lynn
- khan@cheshire.oxy.edu
-