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- Path: sparky!uunet!wupost!udel!gvls1!tredysvr!cellar!swinokur
- From: swinokur@cellar.org (Steve Winokur)
- Newsgroups: comp.sys.amiga.hardware
- Subject: Re: GVP memory question...
- Keywords: how?
- Message-ID: <wNwLqB2w164w@cellar.org>
- Date: 5 Sep 92 02:27:07 GMT
- References: <1992Sep3.200909.6918@en.ecn.purdue.edu>
- Sender: bbs@cellar.org (The Cellar BBS)
- Organization: The Cellar BBS and public access system
- Lines: 53
-
- bevis@en.ecn.purdue.edu (Jeff Bevis) writes:
-
- > I'm considering getting myself a GVP G-Force 030 Combo-25/1 or 40/4
- > but I'd like to know a little more about the memory arrangement...
- >
- > The 25/1 comes with 1Mb and is expandable to 13Mb with the addition of
- > three SIMMs.
- >
- > The 40/4 comes with 4Mb and is expandable to 16Mb with the addition of
- > three SIMMs.
- >
- > The question is, how are they doing this? Consider the 25/1. Initially,
- > it has one meg with it. Is it 8, 16, or 32-bit wide? How do (or CAN)
- > they combine a 1Mb memory with 4Mx24 to achieve 32-bit wide memory?? I
- > suspect the board doesn't really use 32-bit wide memory, and thus I am
- > hesitant to purchase it.
- >
- > Next consider the 40/4. Is the 4Mb initially present 32-bit wide? If
- > so, does the addition of three SIMMs reconfigure the board (perhaps
- > with a jumper change) such that this memory is then part of a 32-bit wide
- > block of 16Mb? This is strange!
- >
- > What's going on here? If someone could help me out, I'd appreciate it!
- > I certainly don't want to get stuck with an 030 board using any non-32-bit
- > memory design.
- >
-
- Well, on all GVP boards, the memory is 32-bits wide. What simms you can use
- on the board depends on what board you buy. The 40/4 can only use 4M simms,
- I believe. The 25/1 can use either 1M or 4M simms. I'm not sure whether
- you can mix or match. In the Series II boards, the 22mhz board had 1M on
- board, and you could mix and match simms to a limited degree.
-
- Me: I have a GVP Series II Combo board (33mhz 030) with 12Megs of 32-bit
- wide memory. It's quite fast :).
-
- If you completely populate a board with 4M simms (16M total), you have a
- choice of placing the memory a) all in "extended" space, b) 4M in
- autoconfig, and the rest in "extended" space, c) 8 M in autoconfig, and 8M
- in "extended" space.
-
- The "extended" memory is DMA'd specially to the Processor on the GVP board,
- which solves the problems with exceeding Auto-Config space :).
-
- -hope this helps out.
- -steve
-
-
- .............................................................................
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