Thanks to Amos, who prepared them for download, here are the Macintosh versions. They, like the Windows version, were written by Mark Heiman.

Macintosh OSX version: macintoshdigitrad_x.sit (7.02 Mb)

Macintosh OS 7.0 to 9.2 version: digitrad_mac.sea (6.69 Mb)

See this file for Macintosh installation instructions: mac_read_me_first.txt