Wonder about first computers for people here.
IBM 650.
"The IBM 650 is a decimal computer made from vacuum tubes in pluggable units with magnetic drum main memory. The basic system consists of the computer itself with a front operator panel, the power supply which is the same size but featureless and the IBM 533 card reader/punch that was the input/output device."

Of course it wasn't actually mine. It was owned by the University of Western Ontario where my brother was doing his undergraduate studies before he was scooped off to do his post-grad at Stanford in what was then called the "brain drain". We did have it all to ourselves at night though. He was still a teenager and I was still in grade school. Kids today don't get that kind of opportunity any more. They can't get away with shit.
As for my first computer that I actually owned, it was a TRS80 Micro Color Computer MC-10 with a Motorola 6803 CPU, 4KB RAM (upgraded to 20KB) and cassette I/O. Needless to say, it blew the old IBM 650 away.
How times change.