| 摘要 |
<p>PURPOSE:To contrive to access plural files without noticing the total number of volumes by writing an EOV record to the end of a volume in detecting a volume end and a file end simultaneously, and writing multi-volume identification data to the head of the next volume. CONSTITUTION:In a 1st case where one record (R) is read and the R is a MVI record, the mode is transited to read one record into a buffer, and in a 2nd case where the R is an EOV record, the loading of the next magnetic tape is requested, and in a 3rd case where the R is an EOF record, the program comes to an end when no next file exists (EOF of volume C) and when the next file exists, the mode in which one record is read in the buffer is transited (EOF of volume b). In case other than the 1st, 2nd and 3rd cases as above, the record R is outputted. Thus, plural files bridged over plural magnetic tape volumes are accessed without noticing the total number of volumes by using the MVI in addition to EOV and EOF in this way.</p> |
