diff --git a/emulator/devices.py b/emulator/devices.py
index a5a065b..7e96d25 100644
--- a/emulator/devices.py
+++ b/emulator/devices.py
@@ -9,7 +9,7 @@ class tty(Device):
     def __setitem__(self, index: int, value: int):
         if index & 0xf == 0xd:
             if value & 0x800:
-                print(((~(value & 0x7FF)) + 1) * -1)
+                print((((value & 0x7FF) ^ 0x7FF) + 1) * -1)
             else:
                 print(value)
         elif index & 0xf == 0xe:
diff --git a/emulator/main.py b/emulator/main.py
index 6dce04b..9c6cdc4 100644
--- a/emulator/main.py
+++ b/emulator/main.py
@@ -11,7 +11,7 @@ def main(argv: Sequence[str] | None = None):
     from time import sleep
 
     machines = {
-        'tty': lambda rom: Computer(Memory(rom, [tty(0x7FE, 0x7FF)]))
+        'tty': lambda rom: Computer(Memory(rom, [tty(0x7FD, 0x7FF)]))
     }
 
     parser = argparse.ArgumentParser(
diff --git a/language/examples/test1.s b/language/examples/test1.s
index 80385a6..522824e 100644
--- a/language/examples/test1.s
+++ b/language/examples/test1.s
@@ -13,7 +13,7 @@ main:
 loop:
     ; Output current value
     liu 0x1f
-    lil 0x3E
+    lil 0x3D
     str D0
 
     ; Move values down