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Pioneer PX-7 Service Manual
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the required conditions are:—CSO and SLTH set to 0 and SLTL set to 0CS1 and SLTH set to 0 and SLTL set to 1CS2 and SLTH set to 1 and SLTL set to 0CS3 and SLTH set to 1 and SLTL set to 1That is,PAO = CSOL -* 0 If 11100100 = E4(H) is set inPAO thruPA1 = CSOH -* 0 PA7, the CPU can handle thememoryPA2 = CS1L -> 1 area shown in the diagram belowPA3 =PA4 =CS1H -CS2L-PA5 = CS2H -PA6 = CS3L -PA7 = CS3H -* 1consecutive 64K byte memory.This method also prevents thedangerof bus collisions if identicaladdress memories in differentslotsare accessed simultaneously.Fig. 13-31 Slot selection |
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