Given the values below will be stored in 4 bytes (32 bits). Show how each would

Question

Given the values below will be stored in 4 bytes (32 bits). Show how each would be stored given the corresponding "Endian" format. The values are given in decimal format, convert to hexadecimal. Remember that negative values are stored in two's complement format: Input/output and Storage Systems (each blank is 1 point. 10 points total 10%) Match the I/O Control Method with its closest description below. ___________ CPU offloads I/O transfer to a controller. Provides source, destination and amount to transfer __________ I/O devices share address space with memory. Each device has its own memory block. _________ Also called polled I/O the CPU initiates I/O, then tests device to determine if I/O completed ________ I/O Processors (IOPs) can execute programs to control and determine pathways for data _______ The converse of programmed I/O, the CPU performs other work until a device raises

Explanation / Answer

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Using 32 bits,

decimal : 30786
binary form : 00000000 00000000 01111000 01000010
hex form : 00 00 78 42
big endian: 00 00 78 42
little endian: 42 78 00 00

decimal : -2905
binary form : 11111111 11111111 11110100 10100111 (2s complement)
hex form : FF FF F4 A7
big endian: FF FF F4 A7
little endian: A7 F4 FF FF

DMA: CPU offloads I/O transrer to a controlller. Provides source, destination and amount of transfer
MMI/O (memory mapped): I/O devices share addres space with memory. Each device has its own memory block
PI/O (programmed IO): Also called polled IO, the CPU intiates I/O, then tests device to determine if I/O completed
CI/O (channel I/O): I/O Processors(IOPs) can execute programs to control and determine pathways for data
IDI/O (interupt driven IO): The converse of programmed I/O, the CPU performs other work until a device raises a signal

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