diff --git a/build/ka10/include.tcl b/build/ka10/include.tcl
index 0b9aac01..21e8c50f 100644
--- a/build/ka10/include.tcl
+++ b/build/ka10/include.tcl
@@ -108,7 +108,7 @@ proc dskdmp_switches {hriflg} {
     respond "RM80P=" "N\r"
     respond "RH10P=" "N\r"
     respond "DC10P=" "N\r"
-    respond "NUDSL=" "250.\r"
+    respond "NUDSL=" "500.\r"
     respond "KS10P=" "N\r"
     respond "KL10P=" "N\r"
 }
diff --git a/build/pdp10-ka/config.202 b/build/pdp10-ka/config.202
index e74cd0ed..75f74c73 100644
--- a/build/pdp10-ka/config.202
+++ b/build/pdp10-ka/config.202
@@ -211,7 +211,7 @@ DEFOPT SCHBLN==10.	;NUMBER OF RUNNABLE JOBS TO REMEMBER
 DEFOPT NQCHN==30.	;NUMBER 2314 CHNLS
 DEFOPT NQS==4		;# DISK UNITS
 DEFOPT NTUTBL==1	;TUTS ARE ONE BLOCK LONG
-DEFSYM NUDSL==250.	;# USER DIRECTORIES ON DISK
+DEFSYM NUDSL==500.	;# USER DIRECTORIES ON DISK
 DEFOPT RP10P==1		;HAS DEC RP10 DISK CONTROL (RP02)
 DEFOPT QRDCMP==1	;SOFTWARE READ-COMPARE
 DEFOPT DMDSK==1		;USES DM DISK FORMAT
diff --git a/src/system/salv.317 b/src/system/salv.317
index 8668e120..aaef880a 100644
--- a/src/system/salv.317
+++ b/src/system/salv.317
@@ -116,7 +116,7 @@ PRINTX /Which machine? /
 	SA==105*2000	; KA system is big, need to push SALV higher.
 	FIRSPK==0
 	LASTPK==3
-	NUDSL==250.
+	NUDSL==500.
 	DC10P==0
 	RP10P==1
 	RH10P==0