Let us consider a memory that includes two instructions. First instruction is located at memory address 045 that includes an address mode bit 0, an operation code 101, an address 160. The second instruction is located at the end of a subroutine that includes an address mode bit 1, an operation code 100, an address 160. The subroutine starts at memory location 161 and the content of PC is equal to 046. a) Draw two block diagrams of the memory to represent the status of the above instructions before and after execution phase; b) List the instructions mentioned above and state the relationship between them. Hints: You can refer Table 1. Table 1: Basic Computer Instructions Henadecimal code Symbol 1-0 1-1 Deseription AND ADD LDA STA BUN O AND memory word to AC l P Add memory word to AC 2 A Load memory word to AC Be Store content of AC in memory Branch unconditieonally Dx Branch and save retun adre S BSA ISZ Increment and skip sere E CLA CLE CMA CME CIR CIL INC SPA SNA SZA SZE HLT 7800 Clear AC Clear E 7200 7100 Complement AC Complement E Circulate right AC and E 7040 Greulate leh AC and E Increment AC 7000 7010 7004 7002 7001 Saip nest instruction if AC positive Skip nest instruction if ACgative Saip next instruction if AC aere Skip nest instruction if Eis Halt computer INP OUT SKI SKO ION IOF Iaput character to ACc Output character trom AC Saip on input flag Skip on output fag Interrupt on Interrupt of F00 F200 FI00
Let us consider a memory that includes two instructions. First instruction is located at memory address 045 that includes an address mode bit 0, an operation code 101, an address 160. The second instruction is located at the end of a subroutine that includes an address mode bit 1, an operation code 100, an address 160. The subroutine starts at memory location 161 and the content of PC is equal to 046. a) Draw two block diagrams of the memory to represent the status of the above instructions before and after execution phase; b) List the instructions mentioned above and state the relationship between them. Hints: You can refer Table 1. Table 1: Basic Computer Instructions Henadecimal code Symbol 1-0 1-1 Deseription AND ADD LDA STA BUN O AND memory word to AC l P Add memory word to AC 2 A Load memory word to AC Be Store content of AC in memory Branch unconditieonally Dx Branch and save retun adre S BSA ISZ Increment and skip sere E CLA CLE CMA CME CIR CIL INC SPA SNA SZA SZE HLT 7800 Clear AC Clear E 7200 7100 Complement AC Complement E Circulate right AC and E 7040 Greulate leh AC and E Increment AC 7000 7010 7004 7002 7001 Saip nest instruction if AC positive Skip nest instruction if ACgative Saip next instruction if AC aere Skip nest instruction if Eis Halt computer INP OUT SKI SKO ION IOF Iaput character to ACc Output character trom AC Saip on input flag Skip on output fag Interrupt on Interrupt of F00 F200 FI00
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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