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  2. Timeline of DOS operating systems - Wikipedia

    en.wikipedia.org/wiki/Timeline_of_DOS_operating...

    IBM Cassette BASIC, cassette operating system, power-on self-test, I/O drivers, graphic patterns for 128 characters in graphics mode, disk bootstrap loader [82] mass storage devices: IBM cassette tape, supported by the BIOS and Cassette BASIC ROM—no disk operating system required, or supports it. Few were sold