How to Use Pep/6 on the Unix System

Pep/6 should be working on all machines now.

The way to execute the Pep/6 assembler (asem) and the machine itself (pep6) ought to be just to type the commands asem and pep6. However, this only works if your 'path' is set correctly, and it doesn't look as though that's been done for students of 221. Unless and until this is done by the system staff, here what you can do for yourself.

  1. Type the following commands at the zeus% prompt: 
    echo 'setenv PATH ${PATH}:/usr/local/pep6/' >> .cshrc
source .cshrc

    Type the above command exactly as shown. (If you know any Unix you know why!)

  2. Then try typing the command pep6. This should now start up the pep6 machine, and show you this: 
    zeus% pep6
 
Pep/6 Machine Simulator      Version UNIX/6.0             Pepperdine University
 
Pep/5 Operating System ROM   Version OS/6.0
  3152 bytes RAM free.
 
L(oader  X(ecute  D(ump  T(race  I(nput  O(utput  Q(uit
Enter Pep/6 command: _

    If you don't get this, but instead get something like pep6: Command not found, then send email to Dave Dove.

  3. You don't have to do the above every time, only just once.
  4. To use Pep/6, you have to do basically three things:
    1. Create a source file in the assembler language using your favorite text editor
    2. Assemble the source file by typing the command asem. The assembler prompts you for a file name.
    3. Load and then execute the resulting 'object file' using the commands of the Pep/6 program. First, type pep6 to get the program running, then use the commands shown. It prompts you with the line above. Use L to load your object file, X to run it, T to change the way it traces exexcution, D to examine the contents of memory, and I and O to change where input and output comes from and goes to.
  5. If you have access to a Mac or a Windows PC, then the Pep/6 software on those machine is a lot more self-explanatory and user-friendly. However, the function is the same, and you're welcome to use the Unix version if you like.