O2501 is the calling code for a program written comparing a program of a hole pattern stored at address O2501 and a fixed cycle of same hole pattern stored at O2502.
O2501 is the calling code for a program. This program is written comparing a program of a hole pattern. This hole pattern is stored at address O2501. This hole pattern is stored at a fixed cycle of same hole pattern. This same hole pattern is stored at O2502.