This document provides compatibility information and basic troubleshooting for installing Mac OS 8.6.

1. Make sure you have at least 24 megabytes (MB) of RAM installed in your computer.
2. Turn off any security software that you may have installed on your computer.
3. If you have a PowerBook, make sure that it is plugged into an AC power outlet and set not to go to sleep.
4. Start up your computer using the Mac OS CD. (Hold down the "C" key while you restart). If you're installing from a network or your computer does not have a CD-ROM drive, you should turn off any virus-protection software and non-Apple extensions and control panels that you may have installed, then restart your computer. See the installation manual for details.
5. It's recommended that you do an easy installation to update your system software. If you plan to do a clean installation instead, write down your current Internet settings, such as the IP address, subnet mask, name server, and so on from the TCP/IP, PPP or Remote Access, and Modem control panels. After installation, the Internet Setup Assistant will ask you to enter this information. (If you do an easy installation, you do not need to write down this information.)
6. If you are the administrator for a NetBoot-capable server, before you install Mac OS 8.6, please go to the Apple support Web site in the Mac OS X server section at: http://www.apple.com/support/ for the latest version of the NetBoot Desktop Admin and follow the instructions in the related Read Me.
7. Although compatibility issues are not expected, check with the manufacturers of any non-Apple software you use to make sure it is compatible with Mac OS 8.6. For information on isolating compatibility issues, see the troubleshooting section in this document or the troubleshooting chapter in your installation manual.
8. Review the compatibility information in this document.

• Installing Mac OS 8.6 on computers with Ultra Wide SCSI cards
  Some older Ultra Wide SCSI cards require a firmware update before they will work with Mac OS 8.6. If the card's firmware is not compatible, your computer will crash during installation or when you start up from the CD. Before installing Mac OS 8.6, contact the manufacturer of your SCSI card to determine if a firmware update is necessary.

• Internet Setup Assistant and LAN connections
  If you connect to the Internet over a local area network, select the "add a new Internet configuration" option when you use the Internet Setup Assistant. (Selecting the option to modify the default configuration will not configure your TCP/IP settings correctly.)

• Third-party Finder and utility software
  Some third-party programs that extend or add features to the Mac OS may not be compatible with Mac OS 8.6. Examples include programs that change the way menus work, change how files are stored, or alter the way you work with files in the Finder. You may need to upgrade these applications before you can access the files they affect. For more information, contact the third-party software manufacturer.

• Computers with DOS compatibility cards
  Apple DOS Compatibility cards do not work with Mac OS 8.6.

• Computers with PowerPC processor upgrade cards
  Computers with 680x0 processors that have been upgraded with a PowerPC processor upgrade card do not work with Mac OS 8.6.

• 400K floppy disks and Mac OS 8.6
  The 400K MFS disk format is not supported by Mac OS 8.6. If you have information or programs on 400K disks that you want to access, copy the files to your hard disk or another storage device before installing Mac OS 8.6.

• QuickDraw GX and Mac OS 8.6
  After installing Mac OS 8.6, you may not be able to print from application programs that use QuickDraw GX. For more information, see About QuickDraw GX on the Mac OS 8.6 CD.

• MacODBC and Mac OS 8.6
  If you use MacODBC, you should either install it before installing Mac OS 8.6, or perform a custom install of MacODBC and make sure the ASLM extensions are not selected. The MacODBC installer installs older versions of ASLM extensions that are incompatible with Mac OS 8.6.

• Installing Mac OS 8.6 on accelerated NuBus PowerPC computers
  If you have a Power Macintosh 6100, 7100, 8100, or 9150 with a third-party accelerator card installed, the Installer might not install Mac OS 8.6. For more information, contact the accelerator card's manufacturer.

• Performa or Power Macintosh 5000 and 6000 series computers
  Some Performa or Power Macintosh 5200, 5300, 6200, and 6300 series models cannot use Mac OS 8.6 until a hardware issue is fixed. The repairs are covered under the Apple repair extension program. To see if your computer has this hardware issue, use the 5xxx/6xxx Tester utility in the Utilities folder on the CD before installing Mac OS 8.6.
  
  IMPORTANT The Power Macintosh or Performa 5260, 6320, and 6360 do not have this hardware issue. You do not need to use the tester program if you have one of these computers.