an example can be found on AMOSPro_Examples:Examples/H-6/Help_62.AMOS
Enters a "WAIT" instruction at the current point in your copper list.
Cop Wait x,y
x can be a hardware coordinate from 0 to 448.
y can be any value from 0 to 312.
Cop Wait x,y,xmask,ymask
xmask and ymask are bitmasks which allow you to wait until the screen coordinates satisfy a specific combination of bits. They default to $1FF.