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What is the purpose of an input device? Give examples of input devices for computer systems.
What is the loaded characteristic impedance of the bus? What is the fastest rise time of bus drivers that can be tolerated?
What is hot or live insertion and why is it so important today? What is it so difficult to guarantee the absolute effectiveness of a live insertion system?
Note that a suitable protocol is needed to determine which device may access the message bus.
What are the advantages and disadvantages of the VMEbus's nonmultiplexed address and data buses'?
VMEbus has six address modifier lines, AMO to AM5. What is their significance and how are they used? What does daisy-chaining mean in the context of the VMEbus?
What does fairness mean in the context of bus arbitration? What is the difference between a TAS timing cycle and the timing cycle of other 68000 instructions?
What are the principal differences between the VMEbus and the NuBus? Compare and contrast the ways in which the VMEbus and NuBus carry out arbitration.
Describe how a 68000 module can be forced into a self-test mode and indicate the hardware and software necessary to perform the task.
Design a circuit to perform arbitration process and provide timing diagrams where necessary. What measures you would take to avoid the danger of metastability.
What facilities or attributes make a microcomputer difficult to test? Why are closed-loop systems harder to test and debug than open-loop systems?
Write a program to test read/write memory. How do you think that peripherals may be self-tested? What additional hardware is required for these tests?
Describe how a logic analyzer is used to test and debug a 68000-based single-board computer. What are the limitations of a logic analyzer?
If the single-step feature is omitted and fusible logic (PAL, etc.) used wherever possible, how far can the chip count of TS2 be reduced?
A designer wishes to produce an entirely general-purpose 68000 board and one of the design specifications. Design the logic required to implement this system.
In this way. it is forced out of its hang-up state. Design a watchdog tinier for a 68000 system.
A test command that tests read/write memory in the region from Address_l through Address. Design a subroutine to implement these functions.