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    • 8. 发明专利
    • ADDRESS CONVERTING CIRCUIT
    • JPS61228539A
    • 1986-10-11
    • JP6894585
    • 1985-04-03
    • HITACHI LTD
    • KOBAYASHI SHIGEO
    • G06F12/02G06F12/06
    • PURPOSE:To give an access to a memory having its capacity larger than the address supported by a computer without adding any special function to the memory, by changing the contents of both upper and lower limit address setting registers. CONSTITUTION:The contents designated by an input/output instruction given from a data bus 6 connected to a microcomputer 1 are set to the lower and upper limit address setting registers 21 and 22 and a base register 23 respectively. At the same time, an address range detecting circuit 24 compares an address 4 given from the computer 1 with the contents of both registers 22 and 23 for output of a detecting signal 25 for designated address range. When the signal 25 is set to an address selecting circuit 26, the address 4 is added with the contents of the register 23 by an addition circuit 27. The value of this addition is delivered to a memory 3 as an address signal 5. While the address 4 is delivered as the address signal 5 when no signal 25 is set.