diff --git a/src/main/kotlin/com/thequux/mcpdp/core/CPU.kt b/src/main/kotlin/com/thequux/mcpdp/core/CPU.kt
index 66f7366..ce4a76e 100644
--- a/src/main/kotlin/com/thequux/mcpdp/core/CPU.kt
+++ b/src/main/kotlin/com/thequux/mcpdp/core/CPU.kt
@@ -1052,7 +1052,9 @@ class CPU(val mbus: MemBus, var tracer: ITracer = NullTracer()) {
         }
 
         override fun setw(addr: UInt, value: UShort) = when (addr) {
-            0x3_FF78u -> {} // console switch/display reg
+            0x3_FF78u -> {
+                System.err.print("\u001b]0;${value.toOctal()}\u0007")
+            } // console switch/display reg
             0x3_FFE6u -> control_reg = value
             0x3_FFF0u , 0x3_FFF2u , 0x3_FFF4u, 0x3_FFF8u -> {} // read-only registers
             0x3_FFF6u -> cpu_err = value