That's why they called it Portal. Concept is portable to nearly any architecture / platform: iOS, Android, Apple II, NES, Atari 2600... Great work! Portal Prel

That's why they called it Portal. Concept is portable to nearly any architecture / platform: iOS, Android, Apple II, NES, Atari 2600... Great work! Portal Prelude for Texas Instruments Calculators https://www.ticalc.org/archives/files/fileinfo/451/45101.html https://www.ticalc.org/archives/files/fileinfo/451/45101.htm...