| 摘要 |
<P>PROBLEM TO BE SOLVED: To reduce storage capacity in a main control board. <P>SOLUTION: When a table selection condition is A, a variation pattern command is determined on the basis of a table 17a, and when the table selection condition is B, the variation pattern command is determined on the basis of a table 18a. For a random number range of 207 to 3961, the same variation pattern command as the table 17a is allocated to the table 18a, and one variation pattern command is allocated to all of 3962 to 4000. In all cases that the table selection condition is A or B, when read-ahead performance is performed, an advance decision command is determined by referring to an advance decision command determination table having the same random number value allocation as the table 17a. When the table selection condition is B and the advance decision command in which a random number value of 3962 to 4000 is allocated is transmitted from a main control board to a sub control board, conversion processing is performed in the sub control board to perform the read-ahead performance. <P>COPYRIGHT: (C)2013,JPO&INPIT |
