Dates are approximate. I’d argue 1996 and 2006 were smaller epochs mostly localized to the PC industry; but 2001 and 2011 had much larger rippling effects.
The Apple II and Commodore PET become popular in business with titles such as VisiCalc, the early computer spreadsheet. This proves the utility of PCs in that field. The Apple II also finds a niche in education with titles like the Oregon Trail.
The Commodore 64 and ZX Spectrum become very popular computers due to their decent set of features for a very low price. The IBM PC comes out and legitimizes the personal computing industry. Poor quality titles and overproduction cause the Atari 2600 and its competitors to collapse, creating a stigma around video game consoles.
The Macintosh had introduced a bitmapped, easy to use system with a consistent HIG, and others followed. The Acorn Archimedes comes out in the UK, and its CPU,