A pc104 industrial motherboard is needed. There is no need to specify the model. Just choose one with a low price. I chose Kontron MOPS/686+

166 mmx cpu，

32m memory

Expand the cf card by 2G

usb sound card 

com mouse 

ps2 keyboard 

It has a complete interface.


The LCD can be 5.6-inch and comes with a vga driver version.

The mouse uses an outdated trackball and is very cheap

For the keyboard section, the pcb has been redesigned