diff --git a/build/pdp10-ka/config.202 b/build/pdp10-ka/config.202
index cd13704a..2c88f0e6 100644
--- a/build/pdp10-ka/config.202
+++ b/build/pdp10-ka/config.202
@@ -429,7 +429,8 @@ DEFOPT NQS==6		;# OF DISK UNITS (3 RP04'S AND 3 T-300'S)
 DEFOPT NTUTBL==2	;TUTS ARE TWO BLOCKS LONG
 DEFSYM NUDSL==500.	;# USER DIRECTORIES ON DISK
 DEFOPT NQCHN==50.	;NUMBER 2314 CHNLS
-DEFOPT RH10P==1		;HAS DEC RH10 DISK CONTROL (RP04)
+DEFOPT RH10P==1		;HAS DEC RH10 DISK CONTROL
+DEFOPT RP04P==1		; WITH RP04 DISKS
 DEFOPT T300P==3		;TRIDENT T-300S VIA PDP-11 START AT DRIVE 3
 DEFOPT QRDCMP==0	;SOFTWARE READ-COMPARE, HARDWARE IS PINING FOR THE
 			; FJORDS (But this isn't debugged yet.)
diff --git a/build/pdp10-kl/config.202 b/build/pdp10-kl/config.202
index 31173d7c..96de871f 100644
--- a/build/pdp10-kl/config.202
+++ b/build/pdp10-kl/config.202
@@ -427,7 +427,8 @@ DEFOPT NQS==6		;# OF DISK UNITS (3 RP04'S AND 3 T-300'S)
 DEFOPT NTUTBL==2	;TUTS ARE TWO BLOCKS LONG
 DEFSYM NUDSL==500.	;# USER DIRECTORIES ON DISK
 DEFOPT NQCHN==50.	;NUMBER 2314 CHNLS
-DEFOPT RH10P==1		;HAS DEC RH10 DISK CONTROL (RP04)
+DEFOPT RH10P==1		;HAS DEC RH10 DISK CONTROL
+DEFOPT RP04P==1		; WITH RP04 DISKS
 DEFOPT T300P==3		;TRIDENT T-300S VIA PDP-11 START AT DRIVE 3
 DEFOPT QRDCMP==0	;SOFTWARE READ-COMPARE, HARDWARE IS PINING FOR THE
 			; FJORDS (But this isn't debugged yet.)