diff --git a/src/vm.py b/src/vm.py
index d603b2d..a8d4097 100644
--- a/src/vm.py
+++ b/src/vm.py
@@ -96,23 +96,53 @@ class VM:
         """
         opcode = self.mem[self.pc.value]
         opdesc = self._fetch_opcode_desc(opcode)
+        args = self._parse_arguments(opdesc)
         if not VMFlags.AFTER_BRANCH:
             self.pc = c_uint32(self.cc.value + 1)
-        self._vm_flags 
+        self._vm_flags &= ~(VMFlags.AFTER_BRANCH)
 
     def continue_(self) -> None:
         """
         Continue from current breakpoint
         """
-        pass
+        while ((self.pc.value < len(self.mem) // 4)
+               and not self.pc.value in self.breakpoints):
+            self.step()
+        print("breakpoint")
+        input()
 
     def run(self) -> None:
         """
         Run from very beginning
         """
+        self.pc = c_uint32(0)
+        while (self.pc.value < len(self.mem) // 4):
+            self.continue_()
 
     def _fetch_opcode_desc(self, opcode: int):
         return OPCODES[opcode]
+    
+    def _parse_arguments(self, opdesc: OpcodeDescription) -> tuple[int, ...]:
+        addr = self.pc.value
+        main_part = struct.unpack(">BBBb", self.mem[addr:addr+4])
+
+        if not OpF.UNEXPANDED in opdesc.flags or OpF.QUICK in opdesc.flags:
+            upper_part = struct.unpack(">i", self.mem[addr+4:addr+8])
+            return (*main_part, *upper_part)
+        return main_part
+
+    def _run_callback(
+            self,
+            opdesc: OpcodeDescription,
+            args: tuple[int, ...]
+            ) -> None:
+        if opdesc.layout == OpL.MATH:
+            assert len(args) == 4
+            _, r3, r1, r2_or_i8 = args
+            self.instr_callbacks[opdesc](
+                    r3, r1, r2_or_i8
+                    )
+        if opdesc.layout == OpL.MEM
 
     def _math_callback_gen(
             self,
@@ -149,12 +179,12 @@ class VM:
     def _load_callback(self, r3: int, r1: int, disp: int) -> None:
         addr = (self.registers[r1].value + disp) * 4
         self.registers[r3] = c_int32(
-                struct.unpack("i", self.mem[addr:addr+4])[0]
+                struct.unpack(">i", self.mem[addr:addr+4])[0]
                 )
 
     def _store_callback(self, r3: int, r1: int, disp: int) -> None:
         addr = (self.registers[r1].value + disp) * 4
-        self.mem[addr:addr+4] = struct.pack("i", self.registers[r3].value)
+        self.mem[addr:addr+4] = struct.pack(">i", self.registers[r3].value)
 
     def _branch_callback(self, cond: int, disp: int) -> None:
         c = Condition(cond)