The DOS Compatibility Installer for the Mac Environment disk is not shipped with the Performa 640 series DOS Compatible. When you reinstall the system software from the CD-ROM disc, the software required to operate the DOS Compatibility Card is not installed. To use your DOS Compatibility Card again, you need to manually drag the files from the CD-ROM disc to your System folder on your hard disk.
The path to locate these DOS resources on the CD are:
Performa CD -> Hard Disk Files -> System Folder Files -> Extensions to get the following:
PC Clipboard (V 1.0.5)
PC Clipboard Translators (V 1.0.5)
PC Network Extension (V 1.0.5)
PC Print Spooler (V 1.1.1)
PC Setup Guide Additions (V 1.1)
Performa CD -> Hard Disk Files -> System Folder Files -> Control Panels to get the following:
PC Setup (V 1.0.5)
The Preferences folder contains both PC Setup Preferences and Spooler folder, but these can be left out since they are automatically recreated.