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Altair Microsoft BASIC 1.0 on Papertape - Tested Good.
Listing is for a working copy of Microsoft BASIC 1.0 for the Altair 8800 computer. This was produced using an ASR-33 Teletype on NOS paper tape and tested on my Altair 8800 using an ASR-33 and an 88-SIO serial card.
Altair BASIC was one of Microsoft's first products.
Compatible SIO bootloader with instructions can be found