CS273

Homework 1

Due Friday, September 7, 2001

Read text pp 1-10 (but stop before you get to binary-coded decimal)

Please remember - how you get your answers is at least as important as the answers themselves. Show all your work.

For all the problems that involve conversions to and from decimal, use the multiplication method to convert to decimal, and the division method to convert from decimal.

From the Book

from page 45 and 46

• 1-2 (8 points) (b), (e), (f), (g)
• 1-4 (10 points) (a), (c), (d), (f), (i)
• 1-5 (10 points) (b), (c), (e), (h), (j)
• 1-8 (2 points)

Not From the Book

• (2 points) Convert from 654₁₀ to radix base 7.
• (4 points) Convert from 5fc₁₆ to radix base 9.
• (4 points) Using the algebric method discover the value of r given that 8_r * 9_r = 44_r.
• (10 points) Using your Lab1 program, change the program to use the A accumulator instructions and then answer the following questions using the simulator:
  
  • Using your listing file, what opcode is shown for the instruction performing loading (line 2)?
  • Using you listing file, what opcode is shown for the instructions performing adding (line 3)?
  • What is in the A and B accumulators on cycle 0? (Note: no steps have been executed in the simulator.)
  • What is in the A and B accumulators on cycle 2?
  • What is in the A and B accumulators on cycle 7?
  • What is in the PC on cycle 7?
  • What is the opcode for the ``bra'' instruction?

Last modified: Fri Aug 31 09:34:32 MDT 2001