Hewlett Packard HP 95LX
The HP 95LX was launched on April 23, 1991 before the term personal digital assistant, or PDA, found its way into everyday use putting the power of a computer into the palm of your hand. It ran MS-DOS v3.22 in 512K bytes of RAM and 1M-byte ROM and had a QWERTY keyboard and a separate numeric keypad.
My 95LX came with a 256K melcard which expanded the storage a bit. I've not donw much with it as it suffers from a limitation due to the date not being Y2K compatible. It's a neat machine though.