diff --git a/movie.py b/movie.py
index 758c302..a9aee81 100644
--- a/movie.py
+++ b/movie.py
@@ -57,12 +57,7 @@ class Movie:
             # Keep track of where we are in TCP client socket buffer
             socket_pos = self.stream_pos % 2048
             if socket_pos >= 2044:
-                # Pad out to last byte in frame
-                nops = (2047 - socket_pos) // 2
-                # print("At position %04x, padding with %d nops" % (
-                #    socket_pos, nops))
-                for _ in range(nops):
-                    yield from self._emit_bytes(opcodes.Nop())
+                # 2 dummy bytes + 2 address bytes for next opcode
                 yield from self._emit_bytes(opcodes.Ack())
             yield from self._emit_bytes(op)
 
diff --git a/opcodes.py b/opcodes.py
index 090d36b..ea5767b 100644
--- a/opcodes.py
+++ b/opcodes.py
@@ -115,6 +115,11 @@ class Ack(Opcode):
     COMMAND = OpcodeCommand.ACK
     _CYCLES = 100  # TODO: count
 
+    def emit_data(self) -> Iterator[int]:
+        # Dummy bytes to pad out TCP frame
+        yield 0xff
+        yield 0xff
+
     def __data_eq__(self, other):
         return True