Processor upgrades for Macs in the 1990s were commonplace...but earlier models, like the Mac SE, weren't designed with them in mind. That didn't stop clever third parties from figuring out how to make them work, though, and they ended up offering ridiculous results.

Sources:
"After the Split at Apple's Core," InfoWorld, September 30, 1985.
MacUser, April 1987.
Mac SE dual floppy photo: https://en.wikipedia.org/wiki/Macinto...
"More than a Plus," Macworld, April 1987.
"...For the Rest of Us," MacUser, April 1987.
"Beefing Up the SE," Macworld, September 1987.
"News Briefs," InfoWorld, August 27, 1987.

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Intro music by BoxCat Games (https://freemusicarchive.org/music/Bo....