| 摘要 |
PURPOSE:To achieve the assignment of an address and a memory control rationally without excess or deficiency for the memory mixed with memory boards with different capacity, by giving number serially to each memory board through addresses. CONSTITUTION:Numbering is given to each memory board through addresses, and real address accessing is made to a board A where the real address is coincident with the address used for the board. To rest boards B, a positive number subtracting the address of the board A from the real address is taken as the address, and the upper rank bit obtained through subtraction is compared with a set indicating the sequence of a board in the boards B, the board coincident is selected and accessed. As to the boards B, for example, the number of boards A is set with a data setting rotary switch 10, and the address of the board B is set. Next, the upper rank bit is compared with a comparator 14, the order of the board is set and accessing is made by a NAND gate group 16. |
