How Apple’s developers reflashed Mac ROMs in the ’90s #Apple #VintageComputing @dt_db

Doug Brown wrote about the possibility of programmable Mac ROM SIMMs in Quadras a couple of months ago. He suspected that there had been a way for developers at Apple in the 68k Mac era to reflash the ROM in their Macs during development, just like BIOS updates on PCs.

As luck would have it, multiple people pointed out that an Apple internal utility used for ROM flashing had been uploaded to the Macintosh Garden. It was recovered from a prototype PowerBook 520 purchased in 2020.

Check out how Doug went about figuring out how the flasher program worked and using it to make new ROMs in the post here.


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