Sorry, 🏎 Delorean Time Machine couldn't find a snapshot of that URL in its Archive.

gemini://mirrors.apple2.org.za/archive/ground.icaen.uiowa.edu/Mirrors/caltech/demos/dexmas.sdk

Possible reaons:

Options:

Try the URLs directly. It might be live.

Try looking at the cached version of capsule's home page