| 摘要 |
PROBLEM TO BE SOLVED: To reduce production cost even when circuit boards having different functions are present mixedly. SOLUTION: The multiple-pattern circuit board 1 comprises two ROM boards 2 and 3 having an identical circuit pattern except that the surface and rear surface are inverted and being mounted with a mask ROM, and the like, and two RAM boards 4 and 5 having an identical circuit pattern except that the surface and rear surface are inverted and being mounted with an SDRAM, and the like. One of the ROM boards 2 and 3 is arranged under such a state as the other is turned by 180°about the inversion axis Y<SB>0</SB>, and one of the RAM boards 4 and 5 is arranged under such a state as the other is turned by 180°about the inversion axis Y<SB>0</SB>. Consequently, the arranging state of each board is identical in detail on the surface side 1a and the rear surface 1b side of the multiple-pattern circuit board 1. COPYRIGHT: (C)2003,JPO
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