THEOS Multi-User Basic
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THEOS 4.2 used THEOS BASIC version 32 Ver 2.0, while THEOS CORONA (Ver 5.0) uses version Multi User Basic 32/64 Ver 2.1.
Some instructions (like READ, MAT READ, READNEXT and so on) were designed to work on ISAM/LISAM Files directly, which are key:record data base organization.