Zeidman has used QDOS to do his original analysis.

Later, the museum also traced and released a more complete version of the CP/M source code.

Zeidman re-ran his analysis, and presented the results at the Vintage Computer Festival West on August 6.

Get $100,000 Prize if You Find This Secret Command In DOS

So, what was the conclusion of the analysis?

His full analysis of the code and supporting documents arehere.

Source:IEEE Spectrum

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