能同时扫描两个按键的键盘扫描程序，用来做51单片机模拟ps2键盘用。16列，8行，一共可以扫描128个键。-At the same time, the two keys to the keyboard can be scaned , used to do 51 with single-chip analog ps2 keyboard. 16, 8 line, a total of 128 keys can be scanned.