The first electronic digital computer was called the Atanasoff–Berry Computer, sometimes referred to as ABC. It wasn't programable, you could only use it to solve linear equations. And it weighed about 320kg which is over 700 pounds. Not exactly the kind of thing you want sitting on your lap while you read emails in bed.
It was developed back during World War Two.
I learned about it from reading some science fiction novels which mention it. People think it's funny how huge it was, but really when you consider what an enormous leap it was to develop such a thing we all now take for granted, it makes me hope the guys who thought it up were richly rewarded at some point.