11Amdahl's law describes:AThe limit on speed-up from improving only part of a systemBDisk access timesCCache hit ratiosDTransistor countsView AnswerDiscussWorkspaceReportSaveEasy
12DMA (direct memory access) allows:AFaster clock speedsBDevices to transfer data to memory without the CPU copying each byteCMore registersDThe CPU to access disks directlyView AnswerDiscussWorkspaceReportSaveEasy
13Which cache write policy updates main memory only when a line is evicted?AWrite-onceBWrite-backCWrite-aroundDWrite-throughView AnswerDiscussWorkspaceReportSaveEasy
14Direct-mapped cache maps each memory block to:AExactly one cache lineBAny cache lineCNo lineDA set of linesView AnswerDiscussWorkspaceReportSaveEasy
15Microprogrammed control units store control signals in:AControl memory as microinstructionsBCacheCThe ALUDHard-wired logic onlyView AnswerDiscussWorkspaceReportSaveEasy