Answered: 1. Name all of the general purpose…

Engineering

Computer Science

1. Name all of the general purpose registers and some of their special functi

Systems Architecture

7th Edition

ISBN:9781305080195

Author:Stephen D. Burd

Publisher:Stephen D. Burd

Chapter11: Operating Systems

Section: Chapter Questions

Problem 30VE

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Concept explainers

Fundamentals of Input and Output Performance

The I/O subsystem is a component of computer system design that uses buses to assist communication between the Central Processing Unit, Computer Memory/Storage, and Input and Output Devices (that is known as peripheral devices). The I/O subsystem includes disc controllers, tape drives, discs, system buses, and other devices. The I/O database application reads and writes drives using the operating system windows I/O.

Question

1. Name all of the general purpose registers and some of their special functions. 2. How are the segment registers used to form a 20-bit address? 3. (a) If CS contains 03E0H and IP contains 1F20H, from what address is the next instruction fetched? (b) If SS contains 0400H and SP contains 3FFEH, where is the top of the stack located? (c) If a data segment deigns at address 24000H, what is the address of the last location in the segment? 4. Explain what the instruction array and data caches are used for. 5. What is the EU and BIU, and what purpose in the microcomputer? 6. Two memory locations, beginning at address 3000H, contain the bytes 34H and 12H. What is the word stored at location 3000H? See Figure 2.26 for details. Address 3000 Data 34 3001 12 Figure 2.26 For question 6 7. What is a physical address? What are the differences between the 8086 logical and physical memory maps? 8. May memory segments overlap? If so, what is the minimum number of overlapped bytes other than 0? 9. How many of the 16 flag bits actually contain information? Explain the functions.

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Assume that the registers have the following values (all in hex) and that CS=1000, DS=2000, SS=3000, SI=5400, DI=2200, BX= 6000, BP-1000, SP= 1100, AX=4312, CX=11CB, and DX= 2245. Calculate the physical address of the memory where the operand is stored and the contents of the memory locations in each of the following addressing examples: 1- MOV (SI), DL. 2- MOV [DI-9), CH 3- MOV [BP], AL. 4- MOV (SI+BX]. AH. 5- MOV BX, 22AC. 6- MOV [SI]+50, BX. 7- MOV [2000]. DX. 10- MOV (SP), BH. 8- MOV BL, DH 9- MOV [BX]+10, AX.
(a) Which registers are used to access the stack ?(b) With each PUSH instruction, the stack pointer register SP is incremente or decremented by 2.(c) With each POP instruction, SP is incremented or decremented by 2.(d) List three possible logical addresses corresponding to physical address 143F0.(e) The ADD instruction can affect which bits of the flag register ?(f) The carry flag will be set to 1 in an 8-bit ADD if there is a carry out from bit . . .(g) CF will be set to 1 in a 16-bit ADD if there is a carry out from bit . . .
1- Show how each of the following MIPS instructions is converted into machine code. Assume the memory address of the first instruction is 100 hex. addi $t0, $Zero, -50 andi $t1, $t0, 7 Loop:and $t1,$t0,$t1 Sw $t0, 40 ($t1) Bne $t1,$ zero, Loop 2- What is the MIPS assembly instruction for the following machine code? 0x8C220004
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