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Explainer: Mac firmware version numbering

Summary by eclecticlight.co
Firmware engineering must be among the least glamorous of the specialities, but it’s literally among the most fundamental. As regular users seldom need to come into contact with firmware and its versions, how those are numbered is kept as a dark secret. This article reveals what I have gathered. Although you will come across different usage elsewhere, I here draw the distinction between: True ROM, including Macintosh ROM (Classic Macs) and Appl…
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eclecticlight.co broke the news in on Saturday, March 7, 2026.
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