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- Newsgroups: comp.sys.mac.hardware
- Path: sparky!uunet!cs.utexas.edu!wupost!darwin.sura.net!jvnc.net!erenj.com!mbernar
- From: mbernar@erenj.com (Marcelino Bernardo)
- Subject: Re: More memory = lousy performance in IIci. Help.
- Message-ID: <1993Jan7.051320.15588@erenj.com>
- Sender: news@erenj.com (USENET News System)
- Nntp-Posting-Host: pxdvgx.erenj.com
- Organization: Exxon Research and Engineering, NJ
- References: <726249086@juliet.cs.duke.edu> <1993Jan6.153538.5022@gmuvax2.gmu.edu>
- Date: Thu, 7 Jan 1993 05:13:20 GMT
- Lines: 25
-
- In article <1993Jan6.153538.5022@gmuvax2.gmu.edu> csmith@blackplague.gmu.edu (Blackplague) writes:
- >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
- >
- >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.
-
- There is another step that should help.
-
- 3) Install a ram cache card. This would help reduce internal video/CPU
- memor access conflicts.
-
- Marcelino Bernardo
- mbernar@erenj.com
-