Lab 8

Due Thursday, March 4, 9PM

Because of Dr. Petersen's illness, we will be programming the
simulator this week rather than the boxes.

This is an "ungraded" lab to be checked off during your session this
week.  The lab 8 handin directory will close sometime after 9PM
Thursday.  It is a 10-point ungraded lab.  Hopefully, we will have
enough kits to make use of this the week after next.

Although you are free to discuss the techniques for creating patterns,
please be sure that your patterns are your own.

For this assignment:

a.  Decide on 4 (or more) different patterns of bits that you would 
    like to see on the LEDs.  For example, a single lit bit marching
    from left to right, or perhaps a pair, or....  
    Use your imagination.  You may want to try using some of the bit
    manipulation instructions.

b.  Write each as a subroutine that works as follows:

    If passed a 0 in the accumulator, it initializes itself

    Otherwise, it performs whatever function takes it from one
    configuration to another, with the input and the output being in
    the accumulator.

c.  Write a main program that will call each of the four routines the
    appropriate number of times.

    For example, if a single 'on' bit is moved left to right to left,
    0 would initialized the accumulator to 11111110 (the LEDs turn on
    for a 0), then the eighth call would result in 011111111,
    and routine would detect the pattern 01111111 and start rotating
    in the other direction to get back to 1111110 on the sixteenth
    call. 

d.  Test your main program and explain it to the TA during your
    Wednesday or Thursday lab.  Add a breakpoint to your program after
    the call to each routine so that the bits marching through the
    accumulator can be observed.

e.  In your README, describe the patterns you have come up with and
    how you implemented them.

SUBMIT:

    README
      a. Name, login, etc
      b. Descriptions of the bit patterns you've decided on
      c. Other program information
      d. What do you think of the HC11 vs MIPS?

    bits.asm


Grading:

 10: Program and readme
  8: Program and poor readme
  5: Just program or just readme

Checkoff:
 -4:  No checkoff or program not working during checkoff