Twenty-five years ago Saturday, on Sept. 20, 1989, Apple released its first “portable” Macintosh computer — and “portable” belongs in quotation marks, because Sisyphus might as well have been made to lift this thing up a hillside for eternity. Coming in at a hefty 16 pounds — that’s more than five MacBook Airs, and about four of IBM’s rival product at the time — Apple’s Macintosh Portable had a price tag to match its weight: $6,500 got you the machine, loaded with super-modern features like an “active-matrix screen” and a “cursor-control device called a trackball,” as TIME described it in the Sept.