This is the same question as to why ROM in CD ROM stands for Read Only Memory. Or why a computer print-out of a person is called a photograph. Once something is labeled, anything that resembles it is called the same thing.
Originally computers were so big and weighed so much they stayed in one place permanently! But as the size shrank and as well as the weight they could be somewhat portable thus began the “lugable computers”
Then they made the battery operated computer that was smaller and that you could balance on your lap weighing in at 25 lbs! This was called a laptop computer, imagine operating your computer for 40 minutes without being plugged in WOW! 🙂
Each year they got smaller and weighed less, until they weighted as much as a high school notebook! Thus began the “notebook computer“.
Old timers that used the portable computer (the lugable) back in the late 70’s call all portable computers today “Lugables” Those who used the portable computer in the 80’s call all portable computers today “laptops“. Those who used the portable computer in the 90’s call all portable computers today “notebooks“. Now the “Netbook” is out and it is powered with the worlds smallest processor and has 10 hours of battery time and weighs less then 2 lbs. Guess what it is called?
a Lugable, a laptop, a notebook and of course a netbook.
I don’t think I have to answer the question; Why is a computer printout of a person called a photograph? 🙂