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▀ This function is used when switching from sequential to random I/O
  within a file. The contents of the relative-record field (offset 21H)
  are derived from the record size (offset 0EH), current block (offset
  0CH), and current record (offset 20H) fields of the file control block.
 
▀ All four bytes of the FCB relative-record field (offset 21H) should be
  initialized to zero before calling this function.
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