Not specifically devoted to schematics or drawings, but manuals used to include those types of resources and they’re relatively easy to find: http://bitsavers.

Not specifically devoted to schematics or drawings, but manuals used to include those types of resources and they’re relatively easy to find: http://bitsavers.org/ http://bitsavers.org/ https://archive.org/details/computermanuals https://archive.org/details/computermanuals http://www.retroarchive.org/ http://www.retroarchive.org/ https://vintageapple.org/ https://vintageapple.org/