in the mid 80s, the c64 was the best selling computer (afaik, still is to this day, the single best-selling model ever), sold like 2m+ units a year, outsold even PCs and apple, and had ~ 40% market share.

it was cheap, it had lots of software, and was accessible--selling at discount retailers instead of just computer stores and shops.

yea. it was 'normal'.

abnormal would have been an outlier like a trs80 or ti99/4a instead of one of the 'big three' of the day.