Apple ColorLaserWriter 12/600PS - Manual (Page 181)

System requirements
To use the printer software, you need a Macintosh with a 68020 or higher
central processing unit (any Macintosh except a Macintosh Plus, SE, Classic,
Portable, or PowerBook 100). Your Macintosh must have system software
version 7.1 or later and at least 4 megabytes (MB) of memory. If your system
software is an earlier version, you need to obtain a system software upgrade
from your computer or software dealer.
Installing all the printer software and fonts for the Macintosh requires
approximately 7.5 MB of free space on your hard disk.
Installing the printer software
To install the printer software on a Macintosh computer, follow these steps:
IMPORTANT Do not “drag install” the printer software. If you do, the files
won’t be properly decompressed and won’t work.
1 Turn off any automatic virus-detection programs you have on your Macintosh computer.
If you don’t, problems may occur during the installation. After installation is
complete, you can turn the virus-detection programs back on. (For
instructions on turning off each virus-detection program, see the manual that
came with the program, or telephone the manufacturer of the program.)
2 Press and hold down the Shift key, then choose Restart from the Special menu.
When a message on the screen tells you that the extensions are off, you can
release the Shift key. Your extensions have been turned off. When you restart
the Macintosh after a successful installation, the extensions will turn on
again.
3 Make sure the printer software disks are locked.
4 Insert Printer Disk 1 for Macintosh into a disk drive.
If necessary, open the disk icon.
156 Chapter 6