diff --git a/build/pdp10-ka/gt40 b/build/pdp10-ka/gt40
index 2df68aa5..9823605c 100644
--- a/build/pdp10-ka/gt40
+++ b/build/pdp10-ka/gt40
@@ -1,4 +1,15 @@
 set cpu 11/05
+set rha disabled
+set lpt disabled
+set dz disabled
+set rk disabled
+set rl disabled
+set hk disabled
+set rx disabled
+set rp disabled
+set rq disabled
+set tm disabled
+set tq disabled
 set cpu 16k
 set tti 8b
 set dli enabled