The Asus Tinker Board is a single-board computer launched by Asus in early 2017. Its physical size and GPIO pinout are designed to be compatible with the second and third-generation Raspberry Pi models. The first released board features 4K video, 2 GB of onboard RAM, Gigabit Ethernet and a Rockchip RK3288 processor running at 1.8 GHz.
Asus Tinker Board
General-purpose input/output
A general-purpose input/output (GPIO) is an uncommitted digital signal pin on an integrated circuit or electronic circuit board which may be used as an input or output, or both, and is controllable by software.
Network router with three GPIOs (Banana Pi R1)
GPIO interface for Hewlett-Packard Series 80 computers (HP 82940A)
Ethernet interface to 48 GPIOs (Sensoray 2410)
Color coded GPIOs (top) on an Asus Tinker Board