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1. What are the four steps of CPU execution are: 2. List all the 8086 register state their purpose. Group them by general purpose, pointing, and segment. They are: ax Accumilator (general purpose storage) cx Counting (input / output addresses) dx Data (store info about peripherals The main purpose of the above started registers is to contain the initial data for, and the results of, arithmetic or logical The main purpose of the above stated registers is to point The main purpose of the above stated registers is to hold 3) List all the 8086 flags and state their purpose. Group them by State flags are so named because their values are influenced by the precious instructions and reflect some peculiarities as a result.
Control Flags are so named because their purpose is to control the execution of certain instructions. - non-voltage (is kept at shut-down) - Volitable (is not kept at shut-down) 5) State and define the three busses used by the CPU. also state if the bus is unidirectional or bidirectional. Sends info (Carry's info as well) 6) A program that will take a single digit numeric input from the computer, convert it to BCD, ass the number, and output the result to the monitor. Jan convert; jan = jump not zero 7) State the difference between a macro and a procedure. Macro - Copies code a compilation / inserts Procedure - Jumps to instruction in memory 8) Give examples of the following addressing modes: 9) Define the following assembler directives: 10) For every 'push' there is a 'pop' 11) Write a program that will encrypt a string by XORing one character with the next character in the string. 12) Write a program that will decrypt the program you just wrote. 13) State the address 5 F 32 A of the next op-code as a segmented address, a logical address.
Give the offset address and the segment address. 14) List all the base-pointers registers and give the segments that they can use. Label the default seen register with each. Don't forget about IP -- Ip must pair with cs, sp with ss because these register are involved in automatic CPU operations. Then you can pair the general-purpose data pointing registers BX, Di, and SI with the data segment register DS -- The IP offset register is always asses to the CS segment register when addressing code memory. There is override available to the programmer. -- The BP or SP offset register is automatically added to the SS segment register when stack operations are in progress. The programmer may not override the automatic selection of SS with SP.
The programmer may override the automatic selection of the DS register and use anyone of the other three segment registers CS, ES, or SS. -- Any offset quantity using registers BX, DI, and Si is automatically added to the DS base register. The programmer may override the automatic selection of the DS register and use any one of the other three segment registered CS, ES, or SS. -- The offset register DI is automatically used with the ES base register when string operations are taking place. The programmer may not override the selection of Di with ES when string operations are done. 15) Give an example of a struct that will store the data for a person age, Bibliography:
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Research essay sample on Main Purpose General Purpose
