The Alfy ASM language is the assembly language for the ALF32 Computer. This virtual CPU has:

• A Harvard Architecture (Program RAM and Data RAM are separate)
• 32 bits instructions
• 64 registers that are 32 bits wide (r0 to r63)
• 49 KB of RAM
• 49 KB of Program RAM

Alfy ASM is simulated using CPUSim version 4. To use the simulator:

1. Download CPUSim version 4
2. Download the alf_computer32.cpu
3. Load it into the simulator

To run a simulation, you may run it in interactive or non-interactive mode.

Read the installation instructions.

To run CPUSim, open a shell and write

java -classpath .:richtextfx-fat-0.6.10.jar cpusim.Main -m alf_computer32.cpu -t file.asm

This will open the UI, load the AlfyComputer_32.cpu and the file.asm.

To run CPUSim, open a shell and write

java -classpath .:richtextfx-fat-0.6.10.jar cpusim.Main -c -m alf_computer32.cpu -t file.asm

This will load the alf_computer32.cpu and run the file.asm.

After loading a machine and a program, to run it:

• In the menu bar, go to Execute and select Assemble & load. This will assemble the program and load it into the program memory
• In the Menu bar, go to Execute and select Debug. This will switch the UI into debug mode. There you can select several options:
  • Start Over - restart the program
  • Go - run the program
  • Step by Instr - go forward one instruction in the program
  • Back one Instr - go back one instruction in the program