Gary Kildall - Wikipedia

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This Week in History of Computing - TINUSAUR

How would the world be different if Gary Kildall made his deal with IBM rather than Bill Gates? - Quora

Unsung Hero: Exploring Gary Kildall, the Man Who Almost Became Bill Gates

Gary Kildall, CP/M OS, First PC Operating System, #studio64podcasts

ASCII - Wikipedia

How would the world be different if Gary Kildall made his deal with IBM rather than Bill Gates? - Quora

Part 2. IBM's mistake in 1980 to agree to allow Microsoft to maintain the right to sell MS-DOS to other computer manufacturers

ASCII - Wikipedia