Operating System (OS)
Trojan-Horse programs

are legitimate programs that allow unauthorized access
do not usually work
usually are immediately discovered
are hidden programs that do not show up on the system
None of these

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Operating System (OS)
The Storage-to-Storage instructions

which perform an operation on a register operand and an operand which is located in the main store, generally leaving the result in the register, expect in the case of store operation when it is also
None of these
All of these
have both their operands in the main store.
which perform indicated operations on two fast registers of the machine and have the result in one of the registers

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Operating System (OS)
The CPU, after receiving an interrupt from an I/O device

branches off to the interrupt service routine immediately
hands over control of address bus and data bus to the interrupting device
None of these
halts for a predetermined time
branches off to the interrupt service routine after completion of the current instruction

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