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3. Answer the following questions for the machine language instructions 6AF82C and D623D0. (a) What is the opcode in binary? (b) What does the instruction do? (c) What is the register-r field in binary? (d) Which register does it specify? (e) What is the addressing-aaa field in binary? (f) Which addressing mode does it specify? (g) What is the operand specifier in hexadecimal?

4. Answer the questions in Exercise 3 for the machine language instructions 7B00AC and F70BD3.

(a) What is the opcode in binary?

(b) What does the instruction do?

(c) What is the register-r field in binary?

(d) Which register does it specify?

(e) What is the addressing-aaa field in binary? Unimplemented opcode, nonunary trap

(f) Which addressing mode does it specify?

(g) What is the operand specifier in hexadecimal?

*5. Suppose Pep/9 contains the following four hexadecimal values:

A: 19AC

X: FE20

Mem[0A3F]: FF00

Mem[0A41]: 103D

If it has these values before each of the following statements executes, what are the four hexadecimal values after each statement executes?

(a) C10A3F

(b) D10A3F

(c) D90A41

(d) F10A41

(e) E90A3F

(f) 790A41

(g) 710A3F

(h) 910A3F

(i) 07

6. Repeat Exercise 5 for the following statements:

(a) C90A3F formfeed horizontal tabulation

(d) E10A41

(i) 06

9. Determine the output of the following Pep/9 machine language program. The left column in each part is the memory address of the first byte on the line:

*(a)

0000 C1000A 0003 81000C 0006 F1FC16 0009 00 000A A94F 000C FFFD

(b)

0000 C10008 0003 06 0004 F1FC16 0007 00 0008 F0D4