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Suppose we define a service routine starting at memory location x4000. This routine reads in a character and echoes it to the screen. ORIG x4000 ST R7, SaveR7 GETC OUT LD R7, SaveR7 RET SaveR7 .FILL x0000 a) If memory location x0012 contains the value x4000, identify how the routine will be invoked. b) Which instruction (provide a memory address) is executed after instruction at location x4002 is executed? c) Which instruction (provide a memory address) is executed prior to instruction at location x4003? d) If memory location x0112 contains the value x4000, identify how the routine will be invoked.

Suppose we define a service routine starting at memory location x4000. This routine reads in a character and echoes it to the screen. ORIG x4000 ST R7, SaveR7 GETC OUT LD R7, SaveR7 RET SaveR7 .FILL x0000 a) If memory location x0012 contains the value x4000, identify how the routine will be invoked. b) Which instruction (provide a memory address) is executed after instruction at location x4002 is executed? c) Which instruction (provide a memory address) is executed prior to instruction at location x4003? d) If memory location x0112 contains the value x4000, identify how the routine will be invoked.

Computer Networking: A Top-Down Approach (7th Edition)
Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
Section: Chapter Questions
Problem R1RQ: What is the difference between a host and an end system? List several different types of end...
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### Service Routine Example In this example, we define a service routine starting at memory location x4000. This routine reads in a character and echoes it to the screen. ```assembly .ORIG x4000 ST R7, SaveR7 GETC OUT LD R7, SaveR7 RET SaveR7 .FILL x0000 ``` ### Questions and Explanations **a) If memory location x0012 contains the value x4000, identify how the routine will be invoked.** - **Answer:** The routine will be invoked if a jump or branch to memory location x0012 is executed in the program. This effectively redirects execution to the address stored in x0012, which is x4000. For example, an instruction like `JMP x0012` would start executing the routine from x4000. **b) Which instruction (provide a memory address) is executed after instruction at location x4002 is executed?** - **Answer:** The instruction at memory location x4003 is executed after the instruction at x4002. The instruction at x4003 is: ```assembly OUT ``` **c) Which instruction (provide a memory address) is executed prior to instruction at location x4003?** - **Answer:** The instruction at memory location x4002 is executed prior to the instruction at x4003. The instruction at x4002 is: ```assembly GETC ``` **d) If memory location x0112 contains the value x4000, identify how the routine will be invoked.** - **Answer:** Similar to part (a), the routine will be invoked if a jump or branch to memory location x0112 is executed in the program. This redirects execution to the address stored in x0112, which is x4000. An instruction like `JMP x0112` would start executing the routine from x4000.
Transcribed Image Text:### Service Routine Example In this example, we define a service routine starting at memory location x4000. This routine reads in a character and echoes it to the screen. ```assembly .ORIG x4000 ST R7, SaveR7 GETC OUT LD R7, SaveR7 RET SaveR7 .FILL x0000 ``` ### Questions and Explanations **a) If memory location x0012 contains the value x4000, identify how the routine will be invoked.** - **Answer:** The routine will be invoked if a jump or branch to memory location x0012 is executed in the program. This effectively redirects execution to the address stored in x0012, which is x4000. For example, an instruction like `JMP x0012` would start executing the routine from x4000. **b) Which instruction (provide a memory address) is executed after instruction at location x4002 is executed?** - **Answer:** The instruction at memory location x4003 is executed after the instruction at x4002. The instruction at x4003 is: ```assembly OUT ``` **c) Which instruction (provide a memory address) is executed prior to instruction at location x4003?** - **Answer:** The instruction at memory location x4002 is executed prior to the instruction at x4003. The instruction at x4002 is: ```assembly GETC ``` **d) If memory location x0112 contains the value x4000, identify how the routine will be invoked.** - **Answer:** Similar to part (a), the routine will be invoked if a jump or branch to memory location x0112 is executed in the program. This redirects execution to the address stored in x0112, which is x4000. An instruction like `JMP x0112` would start executing the routine from x4000.
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