Seiko UC-2000 Wrist Computer
(this I never heard of until now)
In 1984, Seiko came up with the UC-2000 which comes with:
CPU Z80
4Kb SRAM
ROM Basic Microsoft
a matrix display
a calculator
a thermal printer
a QWERTY keyboard
a ROM port for additional applications
a transmission circuit
https://mcttan.wordpress.com/2016/08/17/seiko-uc-2000-wrist-computer/
