Introduction - If you have any usage issues, please Google them yourself
4* 4 keyboard control program// is divided into three parts, part number keys, decimal point, the arrow keys of the function keys (ok) part. Can be adjusted in different page//// using the corresponding menu realize the functions of the operation. Part of the arrow keys /////////////////////////////////////// no return value, no input parameters, use global variables page_number, xposition, yposition, scroll_value