Question

The first PCs.in kit form,

Answer 1

y the mid-1980s

直到20世纪80年代中期

by...直到……

The first PCs.in kit form,appeared in the mid-1970s

第一台整机形式的个人电脑出现在20世纪70年代中期

and by the mid-1980s machines such as the Apple Macintosh and those based on a PC first brought out by IBM in 1981 were popular throughout the world...

直到20世纪80年代中期,像IBM公司于1981年推出的基于个人电脑的苹果电脑那样,类似的电脑已经风靡全世界.