Page Comparison

IN:
     DE = name of information type (null-terminated)
     BHL = extended pointer to buffer for information read
     C = maximum size of buffer
OUT, if call successful:
     Fc = 0
     C = actual data size
OUT, if call failed:
     Fc = 0
     A = return code
          RC_FAIL ($16), information type is not present

Registers changed after return:
     A.B.DEHL/IXIY same
     .F.C..../.... different