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The 8 - bit Motorola 6 8 0 0 microprocessor is to be utilized in the development of a microprocessor board. The system is proposed
The bit Motorola microprocessor is to be utilized in the development of a microprocessor board. The system is proposed to contain a ROM, a RAM, an input port, and an output port that are mapped into the CPUs memory space, according to the specifications given in the table below.
Device Size Desired Base Address
ROM C KB $
RAM KB $
Input LS Byte $
Output LS Byte $
Which one of the following does NOT reflect the characteristics of the mapping possessed by the microprocessor system above?
I. With the mapping, not all instructions which reference to memory can be used
for IO devices
II The mapping has specificdedicated instructions to communicate with IO
devices
III. The mapping takes space for IO devices from the main memory, reducing the
available memory
IV With the mapping, any IO devices are treated as memory locations on the map
V With the mapping, any IO devices use separate memory space
Question Answer
a
I, II and V only
b
I and II only
c
I and III only
d
I, II and IV only
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