https://archive.org/details/digitalecudisk
https://archive.org/details/digitalecudisk18

Also useful:
https://archive.org/details/@diognesthefox?and%5B%5D=dec&and%5B%5D=mediatype%3A%22software%22
https://archive.org/details/@diognesthefox?and%5B%5D=digital&and%5B%5D=mediatype%3A%22software%22