Project 2 - LMC Programming
DAT 2343 - Winter 2000
|Write mnemonic LMC instructions for a program that will input two numbers
and calculate and print the value of the first number raised to the power of
the second number. (See the example, below.)|
|Assemble by hand your mnemonic instructions into LMC numeric codes.|
|Enter your codes and test your program in the LMC simulator under
Windows. (See LMC Simulator, below.)|
|Hand in a diskette and printout containing your program. (See Hand
Your LMC program should input two numbers and calculate and print the value
of the first number raised to the power of the second number.
For example, if the two input numbers were 005 then 004, your code should
output 625, which is 005 x 005 x 005 x 005, that is: 005 multiplied by itself
004 times. Note that, by definition, any value raised to the power of 000 is
equal to 001.
Use the multiplication subroutine developed in class (available on
the Web as well) to perform the multiplication, or develop your own
multiplication subroutine. You must handle multiplication by a call
to a subroutine.
Your mnemonic instructions must use only "label-style references" in
the address/operand field. Do not use any mailbox numbers - use labels
only. (Also, do not use the ORG pseudo-instruction. Code should
begin at mailbox location zero.)
You may assume that the final result will be no greater than 999; there is no
need to check for overflow or other error conditions.
Use the following pseudo-code to develop your mnemonic program:
Set power = 1
While the exponent is greater than 0
Call Multiply subroutine to multiply power by base,
giving new value for power
Decrement the exponent
Subroutine Multiply (from class and web notes)
Multiply two arguments
Return result in calculator
Translate the given pseudo-code into LMC mnemonic instructions.
Hand-assemble your mnemonic instructions into the equivalent LMC numeric
Download the LMC Simulator (see below), which simulates the "Little
Man Computer" with a couple of additional operations. This program should
be run from Windows 95/98. Run the "son of LMC" program and load
your numeric codes into mailboxes; save your program, as required, on a
diskette, using the given file name (below).
Test and, if necessary, debug your program using the "son of LMC"
simulator. (Be sure to resave your modified numeric codes if you make changes,
and to modify your mnemonic instructions to reflect any such changes.)
Print and hand in your mnemonic instructions on a sheet of paper, and
submit a diskette containing your LMC numeric codes and another copy of your
mnemonic instructions as a text file on the diskette. Follow the Hand
In format given below.
LMC Simulator under Windows
The simulator comes in two versions. The basic version, available on
Alan Pinck's site, is known to work reasonably under Windows 95/98. The
enhanced version, which permits editing and other features, is new this
term. I recommend you try the enhanced simulator first; if it
misbehaves, tell me what went wrong and return to the basic simulator.
The Enhanced Simulator can read the data files saved by the Basic
Simulator; but, the Basic Simulator can only read files saved in "old
format". (You will be asked which format you want when you use the
"save" feature of the Enhanced Simulator.) You may submit
files on diskette in either format. Enhanced format is easier to read,
since it is one mailbox per line.
Enhanced Simulator (FoSoLMC.EXE)
If you have Visual Basic 6.0 on your computer, you should only need the
actual program executable, given above. If you don't have Visual Basic 6.0
or the Visual Basic Runtime Libraries on your computer you will need to
download and install them using the (large!)
Setup Kit available here.
The above links are local Algonquin copies of the original files kept on
Hyne's F.O.S.O.L.M.C. site.
Basic Simulator (SonOfLMC.EXE)
The Basic Simulator requires certain Dynamic Link Libraries which are
commonly installed on many systems (all college lab computers should have
these files). Specifically, this program was created using Visual Basic
version 4 and needs VB40032.DLL.
If your computer does not have any of the required files, you can
download a .ZIP version of the entire package including all support files
Pinck Little Man Computer FTP site
The available files include: SonOfLMC.ZIP... the complete executable
package (4Mb) Son_P1.ZIP, Son_P2.ZIP, Son_P3.ZIP, Son_P4.ZIP... all the same
files as the above but broken up into 4 collections, each of which should
fit on a 1.4Mb disk.
Create and hand in a copy of a diskette (please keep the original in case the
copy is unreadable) containing three text-only files, and a printout:
- File 1: A README.TXT text file containing the Ian Allen
Assignment Submission label.
- File 2: A MNEMONIC.TXT text file containing the mnemonic
instructions of your LMC program.
- File 3: A P2CODES.LMC "save" text file from the
LMC simulator containing the LMC numeric codes of your assembled program.
I accept both Enhanced and Basic save formats.
- Printout: Print a clear copy of your five-column (plus comments) MNEMONIC.TXT
file for submission with your diskette. Ensure that the document
prints neatly - pay attention to margins and indentation. Ensure that
all labels used have defined locations. No numeric
arguments/operands are allowed - submit mnemonic instructions with labels
only in this file.
Text Files Only
|All three submission files must be plain text only. Plain text is
readable in Windows Notepad or DOS EDIT (or Unix/Linux vi).
Check the format of your files before you submit them. Do not submit
Word or WordPerfect documents.|
|Use the exact file names given.|
|No variation in spelling of file names is allowed - the program I use to
mark these assignments will not find misspelled files on your diskette.|
If there are any problems, please let me know immediately! firstname.lastname@example.org