Problems: MacKenzie, Chapter 0, problems 1, 5, 6, 7, 10, 11, 23, 24; pages 35-36.

Note 1/21/04:  For those who haven't gotten their texts yet--and to whom I have now given the handouts for doing this assignment, please note the due date for you is Monday 1/26/04.

Reading: MacKenzie Chapter 2 (handouts available outside my office door or in class on Friday).

NOTE 2/9/04 (after class): Do this work and hand it in on Friday 2/13/04 instead of Wednesday.  But, don't just give me answers, like for the ones that have answers in the back of the book.  Work out the solution on paper, and try to be neat in your description of the solution.  We'll look at one or two of these on Wednesday 2/11, Lecture 13.

This may seem like a lot, but it's really not.  Each one, except the last one, is a single question about addressing modes.  The last one is a bunch of separate examples of indicating which modes are being used (the reverse of the others).  Think of it like a puzzle to be solved.

There's no better way to drill on these fundamentals than to practice recognition of specific addressing modes by their format and content.  This will enhance your retention when we get to the actual instructions that use these modes.  Better programmers are those who have the best command of the language, its nuances, and how to get to the most efficient method of solving a programming problem.

Lab Problem:  Take this MC680000 program file, download it and use the WISM68 simulator to: (1) assemble the source program, (2) link/load the program, (3) step through the program, one instruction at a time, looking at the contents of both the Registers and Memory.

For the homework, you will show me that you have completed the assignment but turning in these deliverables: (1) printout of Listing File generated by WISM68 after program assembly, (2) print-screen JPEG image of the Memory window and Register window (which can be done by hitting the "Print Scrn" key, opening MS-Paint, pasting the PC copy buffer contents into Paint, saving it as HW#4, then printing it--making sure to "fit to page").  The screen printout should be clear enough for me to see the contents of the 68000 registers and memory range where the data is located after you have executed the program by stepping one instruction at a time.  This program: ASCBIN-030424.asm

The program we're using is posted here (and also on the Lectures page): Bubblesort.asm, written by G. La'Trice Johnson (from last summer's CSCE 498) and butchered up by me.  Note how I lay my window out when I am doing debug work--see this JPEG image: HW7-debug-desktop.jpg  If you want to print this image, make sure you scale to fit the page size first.

Hint: as you are trying to find the problem, consider the following approach:  consider what types of errors might we possibly have?  (1) program control flow errors (helpful to draw a flowchart of the algorithm), (2) wrong instruction, (3) incorrect specification for one or more operands (addressing mode errors), (4) swapped operand order, (5) incorrect operand length, (6) incorrect register specified in an instruction.  You'll use the WISM68 to check these possibilities as you walk through the Bubble Sort algorithm.  A very important skill is the ability to diagnose problems by troubleshooting, and simulation/debug is the way we do this activity.  But, use your mind, and think through the process.

We'll use the programs and procedures described in Lab #5 - MacKenzie.  Get MacKenzie's Lab #5 (PDF) here.  The difference is that we'll use WISM68 to edit, assemble and execute the programs.  You'll use the Debugging Form in this lab to work each of the problems out by hand, then enter them.  As before, I want the following: (1) 68K assembled listing file (.lst), (2) screen shots showing before and after for the Registers window and the Memory window for the WISM68 simulator program, and (3) the worksheet from the MacKenzie lab.

Here's the MS-Word file for the debugging exercise that is part of our Assignment #9 (MacKenzie's Lab #5).  Get the Word file here:  Lab3-DebuggingWorksheetTemplate-03030 (MS-Word)