6.1 Which of the following properties is TRUE of asynchronous timing, in contrast with synchronous timing for bus communications? Select all that apply.

6.2 Consider a system with a 64-bit data bus that is driven by a 4-MHz bus clock. What is the maximum data transfer rate of the bus in bytes/s? 7.1 Which of the following interfaces enables the direct transfer of data to and from the memory and a peripheral?

7.2 Consider a device that is controlled by an operator through commands entered on a touchscreen. Suppose the CPU scans the touchscreen every 100 ms. The average-number of commands entered in a 4-hour period is K. What fraction would the number of CPU visits to the touchscreen be reduced by usinginterrupt-driven I/O compared to polling?

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