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• 20:47, 6 April 2022 Mizapf talk contribs created page Programmable System Interface (Created page with "The Programmable System Interface (PSI) is a circuit that is used on the TI-99/4A main board, on some expansion cards, and on the Geneve. The designation of the PSI is TMS9901, and this is the name that most users will be more familiar with.")