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additional allows applications approach asserted basic block buffer buses bytes called character chip circuit clock command common complete connected cost counter cycle data bus decoder delay described determined devices diagram digit disk display drive enable EPROM error example execution external Figure functions head implemented increased indicates input instruction interface interrupt keyboard limited lines load logic maximum memory micro microcomputers microprocessor mode multiplexed needed occurs operation output performance peripheral port position printer problem processor produce pulse range receiver reduce refresh relatively request sector segment separate serial shown shows signal single specification speed standard stored switch Table tion track transfer transmit typically voltage wait wide write written