题目内容

In twos complement, overflow may occur when ______.

A. two numbers with the same signadd
B. two numbers with the different sign subtract
C. AandB
D. multiply

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Control unit use some input signals to produce control signals that open the gates of information paths and let the micro-operations implement. Which is NOT the input signals of control unit?

A. clock and flags
B. instruction register
C. interrupt request signal
D. memory read or write

TheREGISTER ADDRESSING has very less address space, but it has (is) _________________.

A. very less value range
B. very fast
C. more memory access
D. complex address calculation

In register indirect addressing, the effective address of operand is stored in____.

A. register
B. main memory
C. instruction
D. PC

Compared with indirect addressing mode，the advantage of register indirect addressing mode is________.

A. Large address space
B. Multiplememory reference
C. Limit address space
D. Less memory access