When you use Installer to install new drivers on an HD20 using a Macintosh
512K, an error is generated ("File System not found on System Tools for...").
This problem may have its origin in HFS. There are three workarounds for it:
1. Drag a copy of the System Folder from the Tools Disk to update the HD20,
2. Move the System file outside of the System Folder when using Installer
2.0, or
3. Use Printer Installation v1.0, part number 690-5075-A.
NOTE: This problem has been fixed in the Macintosh Plus.