Some of the computers I have used

ICL 1301, KDF9, IBM 1401, IBM 7090, ICL 1900, PDP11, IBM System/3

... and actually owned

Larger Computers

Nixdorf, IBM S/32, IBM S/36, AS 400 Model 70, Compaq LSI11

Smaller Computers

Raspberry Pi, Banana Pi

Personal Computers - PC's

Commodore PET, Commodore 64, Northstar Horizon,BBC Micro
PC's by IBM, Epson, Everex, Opus, Tiny, Virgin, IBM PS2

Portable Computers

Epson HX20, PX4, PX8

Laptop Computers

IBM, DEC, Samsung, Olivetti, Acer, Asus

Tablet Computers

Samsung