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System Programming Mid-Term

System Programming Mid-Term . Date: October 28th, 2005 Time: 09:10-12:00 . Q1 (10%). Consider the memory contents shown in the following figure. What would be loaded to register A with the instruction 022030 (hexidecimal)? . Q1 (10%). Q2 (40%).

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System Programming Mid-Term

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  1. System Programming Mid-Term Date: October 28th, 2005 Time: 09:10-12:00

  2. Q1(10%) • Consider the memory contents shown in the following figure.What would be loaded to register A with the instruction 022030 (hexidecimal)?

  3. Q1(10%)

  4. Q2(40%) • Why does Beck's "System Software" textbook design a hypothetical computer SIC to present the concepts in his book? • illustrate the most commonly encountered hardware features and concepts, while avoiding most of the idiosyncrasies (p.4) • easy to learn • What are the maximum memory size of SIC and SIC/XE, respectively? • 215/220 (p.5/p.7)

  5. Q2(40%) • How many addressing modes do SIC and SIC/XE support, respectively? • 2/18 (p.6/p.499) • How many instructions are there in the SIC/XE instruction set? • 59 (p.496~498) • How does SIC determine whether the result of a TD instruction is successful? • CC (condition code) = LT means the device is ready (p.7)

  6. Q2(40%) • What are the two general purpose registers in SIC/XE? • S,T (p.7) • What is the size of F register? • 48bits (p.7) • Why does the assembler need to handle the source files in two passes? • Pass1 assign addresses to all symbol • Pass2 generate object code • in order to solve the problem of forward reference

  7. Q3(10%) • Translate (by hand) the following assembly program to SIC object code. (The output format will look like Figure 2.3, which contains H record, T record, and E record.)

  8. Q3(10%) • Translate (by hand) the following assembly program to SIC object code. (The output format will look like Figure 2.3, which contains H record, T record, and E record.)

  9. Q3(10%)

  10. Q3(10%) HSTRCPY00100000002B T0010000F04102550900F54901A2C1028381003 T00100F0B5445535420535453494E47 T0010250600000000000B E001000 ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^

  11. Q4(10%) • Translate (by hand) the following assembly program to SIC/XE object code.

  12. Q4(10%) • Translate (by hand) the following assembly program to SIC/XE object code.

  13. Q4(10%)

  14. Q4(10%) HSTRCP2001000000027 T0010001175000B05000053A00857A010B8503B2FF5 T0010110B544553542053545249 E001000 ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^

  15. Q5(10%) • Disassemble (convert object code back into assembly language) the following SIC program. HSUM 00100000000E T0010000E01000005000190102D000B3B2FF8 E001000

  16. Q5(10%)

  17. Q5(10%)

  18. Q6(10%) • Simulate (by hand) the execution of the above program and let the breakpoint be 00100E. What would be the value of register A and register X when (PC) = 00100E? • 1+2+3+……+9+10=55 • A=37, X=B

  19. Q7(10%) • Simulate (by hand) the execution of the object code below. Let the breakpoint be 001011. What is the value of register A when (PC) = 001011? HGAUSS 001000000017 T0010000C01000169200B1B4003232008 T00100C0B6F40009C40000002000064 E001000

  20. Q7(10%)

  21. Q7(10%)

  22. Q7(10%) • [(1+100)*100]/2=5050 • A=13BA

  23. Homework • The code can work well  greater than 7 • If I need to correct it  less then 5 • Second chance  23:59 on Nov. 4th (tonight) • Subject of email: [SP HW1v2] ######## • Email to me: s94321517@ncnu.edu.tw

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