Abstract of INFO-MAC archived Text file
   'info/hdwr/iisi-25mhz-upgrade-faq.txt'
  Uploaded 02/28/1993   24091 bytes

From: eepmatt@casbah.acns.nwu.edu (Matthew Friedman)
Subject: The 25MHz IIsi 
Date: Sat, 27 Feb 93 0:49:16 CST 

Here's the FAQ sheet I compiled on the 25MHz upgrade for the IIsi. A couple of
people requested that I send it to you for archiving in your reports section.

-Matt Friedman
eepmatt@casbah.acns.nwu.edu

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FAQ: Upgrading your Mac IIsi from 20MHz to 25MHz
Version 1.3
Compiled by Matt Friedman
eepmatt@casbah.acns.nwu.edu
27 January 1993
 
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This FAQ was compiled from comments, letters, and posts to
comp.sys.mac.hardware. I apologise for the many instances where I have not
been able to include attributions and sources. Maybe in version 2.0....
:)
 
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Contents:
Q: What does the "upgrade" do?
Q: What are the stats on the performance increase?
Q: Why does the upgrade work?
Q: Won't this void my warranty?
Q: Where do I get what I need, and how much will it cost?
Q: So how to I do it?
Q: But my CPU's only rated at 20MHz. How can this work?
Q: Why don't I just replace my CPU with one rated at 25MHz?
Q: Can I go higher than 25MHz?
Q: Do I need a certain speed of SIMMs for this to work?
Q: What if I have a NuBus adapter or FPU?
Q: What's the fail/success rate?
Q: Why doesn't someone just check the speed ratings for all
   the chips?
Q: Doesn't the upgrade produce more heat?
Q: Are there any other drawbacks to the procedure?
Q: What does Apple say about this?
Q: Who should try the upgrade?
Q: Don't you, as the compiler, want to include a disclaimer?
 
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Q: What does the "upgrade" do?
A: The upgrade involves swapping the 40MHz oscillator in your IIsi for a 50MHz