diff --git a/ls8/cpu.py b/ls8/cpu.py
index 9a307496e..b4b0025f1 100644
--- a/ls8/cpu.py
+++ b/ls8/cpu.py
@@ -1,36 +1,63 @@
+# cpu.py
+
 """CPU functionality."""
 
 import sys
+import os
 
 class CPU:
     """Main CPU class."""
 
     def __init__(self):
-        """Construct a new CPU."""
-        pass
-
-    def load(self):
+        # Set RAM
+        self.ram = [0] * 256
+        # Create registers: R0 - R6 empty
+        self.reg = [0] * 8
+        # R7 set to 0xF4
+        self.reg[7] = 0xF4
+
+        # Set program counter to 0
+        self.pc = 0
+        # Set flags to 0
+        self.fl = 0
+        # Memory Address Register, holds the memory address we're reading or writing
+        self.mar = 0
+        # #Memory Data Register, holds the value to write or the value just read
+        self.mdr = 0
+        # Points to the register that contains address of stack pointer
+        self.sp = 7
+
+    def load(self, file_name):
         """Load a program into memory."""
 
         address = 0
-
-        # For now, we've just hardcoded a program:
-
-        program = [
-            # From print8.ls8
-            0b10000010, # LDI R0,8
-            0b00000000,
-            0b00001000,
-            0b01000111, # PRN R0
-            0b00000000,
-            0b00000001, # HLT
-        ]
+        program = []
+        self.reg[self.sp] = len(self.ram) - 1
+
+        input_text = os.path.join(os.path.dirname(__file__), f"examples/{file_name}")
+
+        try:
+            with open(input_text) as my_file:
+                for line in my_file:
+                    comment_split = line.split('#')
+                    possible_binary_number = comment_split[0]
+
+                    try:
+                        x = int(possible_binary_number, 2)
+                        # print("{:08b}: {:d}".format(x, x))
+                        program.append(x)
+                    except:
+                        print(f"Failed to cast {possible_binary_number} to an int")
+                        continue
+        except:
+            print(f"File: {file_name} not found...")
 
         for instruction in program:
             self.ram[address] = instruction
             address += 1
 
 
+
     def alu(self, op, reg_a, reg_b):
         """ALU operations."""
 
@@ -40,6 +67,12 @@ def alu(self, op, reg_a, reg_b):
         else:
             raise Exception("Unsupported ALU operation")
 
+    def ram_read(self, mar):
+        return self.ram[mar]
+
+    def ram_write(self, mar, mdr):
+        self.ram[mar] = mdr
+
     def trace(self):
         """
         Handy function to print out the CPU state. You might want to call this
@@ -62,4 +95,63 @@ def trace(self):
 
     def run(self):
         """Run the CPU."""
-        pass
+
+        running = True
+        ldi  = 0b10000010
+        prn  = 0b01000111
+        hlt  = 0b00000001
+        mul  = 0b10100010
+        push = 0b01000101
+        pop  = 0b01000110
+        call = 0b01010000
+        ret  = 0b00010001
+
+        while running:
+            # print(self.pc)
+            command_to_execute = self.ram_read(self.pc)
+            op_a = self.ram_read(self.pc + 1)
+            op_b = self.ram_read(self.pc + 2)
+            
+            if command_to_execute == ldi:
+                print("LDI executed")
+                self.reg[op_a] = self.pc + 2
+                self.pc += (command_to_execute >> 6) + 1
+            elif command_to_execute == prn:
+                print("Print executed")
+                print(self.reg[op_a])
+                self.pc += (command_to_execute >> 6) + 1
+            elif command_to_execute == mul:
+                print("Mult executed")
+                print(op_a, op_b)
+                self.reg[op_a] *= self.reg[op_b]
+                self.pc += (command_to_execute >> 6) + 1
+            elif command_to_execute == hlt:
+                print("Halt executed")
+                running = False
+            elif command_to_execute == push:
+                self.reg[self.sp] -= 1
+                register_to_get_value_in = self.ram[self.pc + 1]
+                value_in_register = self.reg[register_to_get_value_in]
+                self.ram[self.reg[self.sp]] = value_in_register
+                print(f"Pushing: {value_in_register}")
+                self.pc += (command_to_execute >> 6) + 1
+            elif command_to_execute == pop:
+                register_to_pop_value_in = self.ram[self.pc + 1]
+                self.reg[register_to_pop_value_in] = self.ram[self.reg[self.sp]]
+                self.reg[self.sp] += 1
+                print(f"Popping: {self.reg[register_to_pop_value_in]}")
+                self.pc += (command_to_execute >> 6) + 1
+            elif command_to_execute == call:
+                self.reg[self.sp] -= 1
+                address_of_next_instruction = self.pc + 2
+                self.ram[self.reg[self.sp]] = address_of_next_instruction
+                register_to_get_address_from = self.ram[self.pc + 1]
+                self.pc = self.reg[register_to_get_address_from]
+            elif command_to_execute == ret:
+                self.pc = self.ram[self.reg[self.sp]]
+                self.reg[self.sp] += 1
+            else:
+                print(f"Unkown command: {command_to_execute}")
+                self.pc += (command_to_execute >> 6) + 1
+
+        self.trace()
diff --git a/ls8/ls8.py b/ls8/ls8.py
index 74128d36b..61ebaaf2c 100755
--- a/ls8/ls8.py
+++ b/ls8/ls8.py
@@ -6,6 +6,5 @@
 from cpu import *
 
 cpu = CPU()
-
-cpu.load()
-cpu.run()
\ No newline at end of file
+cpu.load("call.ls8") #fileNameFromCommandLine
+cpu.run()