Minor code cleanups

transcoder/machine.py

@@ -2,24 +2,12 @@
 
 from typing import Iterator
 
-import numpy as np
-
-import screen
-
 
 class Machine:
     """Represents Apple II and player virtual machine state."""
 
-    def __init__(
-            self,
-            memmap: screen.MemoryMap,
-            update_priority: np.array
-    ):
+    def __init__(self):
         self.page = 0x20  # type: int
-        self.content = 0x7f  # type: int
-
-        self.memmap = memmap  # type: screen.MemoryMap
-        self.update_priority = update_priority  # type: np.array
 
     def emit(self, opcode: "Opcode") -> Iterator[int]:
         """