
Was it the first?
"...When Apple's Macintosh was released in January 1984, it was the first mass-market PC to have networking built in.."
Not sure what you mean by the 'first' - you could buy a BBC B with built-in (on the motherboard) EcoNet in 1981-2. Not many of this varient were sold in the UK (not many UK homes had a multi-system network requirement then), but all the US export ones had this in 1983....