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- Newsgroups: comp.sys.mac.hardware
- Path: sparky!uunet!think.com!ames!haven.umd.edu!news.umbc.edu!gmuvax2!usenet
- From: csmith@blackplague.gmu.edu (Blackplague)
- Subject: Re: More memory = lousy performance in IIci. Help.
- Message-ID: <1993Jan6.153538.5022@gmuvax2.gmu.edu>
- Sender: usenet@gmuvax2.gmu.edu (usenet administrator)
- Reply-To: csmith@blackplague.gmu.edu (Blackplague)
- Organization: George Mason University, Fairfax, Virginia, USA
- References: <726249086@juliet.cs.duke.edu>
- Date: Wed, 6 Jan 1993 15:35:38 GMT
- Lines: 25
-
- In article <726249086@juliet.cs.duke.edu> writes:
- > I have recently replaced the memory in my IIci with 8 meg (4 x 2) 80 ns in
- > Bank A and performance has gone to pot. Screen rewrite, window operations
- > and even entering text is much slower. Performance on AfterDark screen
- > savers is noticeably slower: zooming through the universe is now
- > accomplished in a series of jerks.
- > Do you know what I can do to resolve the situat.? The built-in video card
- > may be somewhat shot (power-surges) since B&W mode is lousy, with lots of
- > flicker, although 16 and 256-color is OK (but not perfect). I am thinking of
- > putting in a new video card. Would that speed up my machine. A cache card?
- > Better memory? My monitor is a Sony multi-scan HG 14 in.
-
- The problem is this. The Mac IIc1 uses the first bank of memory for video, so
- there is a constant conflict between the internal video and the processor over
- use of the ram in your system. You have two choices to fix this.
-
- 1) Put the 256k simms that were in Bank A back and put the 2meg simms in bank
- B. Under this configuration, the first bank is reserved for the internal video
- and the processor uses the second bank. This is only true if the first bank
- has ONLY 4 x 256k simms installed.
-
- 2) Get a nubus video card. Then the first and second bank will be usable by
- the processor.
-
- Christian Smith
-