diff --git a/build/misc.tcl b/build/misc.tcl
index 89659374..97cdb370 100644
--- a/build/misc.tcl
+++ b/build/misc.tcl
@@ -1410,6 +1410,12 @@ expect ":KILL"
 # Maybe roll back to IOELEV 431, or fix it in new version 433.  Maybe
 # link with 11DDT 16K.
 
+# MINITS
+respond "*" ":cwd mits.s\r"
+respond "*" ":palx test_config\r"
+respond ":::" "777\r"
+expect ":KILL"
+
 # TV-11.  STUFF prefers it to be in the "." directory.
 respond "*" ":palx dsk0:.;_system;tv\r"
 expect ":KILL"
diff --git a/src/mits_s/config.850 b/src/mits_s/config.850
index 04454cdb..40844779 100755
--- a/src/mits_s/config.850
+++ b/src/mits_s/config.850
@@ -113,6 +113,7 @@ setf ^"What system are you assembling for?
 	145 <==> COG-SCI-HUB
 	146 <==> NE43-9A-HUB
 	147 <==> AI Bridge 2
+	777 <==> Testing.
 	xyzzy <==>	System xyzzy (template)
 ::: ",system
 
@@ -198,6 +199,7 @@ pdp11==0
 .iif z system-145, pdp11==23
 .iif z system-146, pdp11==23
 .iif z system-147, pdp11==23
+.iif z system-777, pdp11==10
 .iif z system-xyzzy, pdp11==xyzzy
 
 ;;; define CPU dependent things
@@ -3550,6 +3552,51 @@ defdev chs,chsncp,<
 
 .endc system 147
 
+	.sbttl	System 777: Testing
+.if z system-777
+  	.title	Testing
+
+.host. <Testing>
+
+brdtim==-1			;don't answer broadcast requests for the time
+
+memtop==160000			;top of usable memory
+bootad=173000			;bootstrap
+dbugad=bootad			;debug routine (just boot)
+
+defdev np,pktncp,<>
+
+defdev c1,ch11,<
+  ;;;   ch11 vec,csr
+	ch11 270,164140
+  >
+defdev dl,dl11,<
+  ;;;	dl vec,csr   ,typ,baud.,where
+	dl 060,177560,v00,9600.,<Console>
+  >
+
+defdev dz,dz11,<
+  ;;;	dz vec,csr   ,<lines>
+  ;;;	  dzl typ,baud.,P,stp,nbts,where
+	dz 300,160100,<
+	  dzl v00,9600.,n,002,8,<Test-DZ01-CH0>
+	  dzl v00,9600.,n,002,8,<Test-DZ01-CH1>
+	  dzl v00,9600.,n,002,8,<Test-DZ01-CH2>
+	  dzl v00,9600.,n,002,8,<Test-DZ01-CH3>
+	  dzl v00,9600.,n,002,8,<Test-DZ01-CH4>
+	  dzl v00,9600.,n,002,8,<Test-DZ01-CH5>
+	  dzl v00,9600.,n,002,8,<Test-DZ01-CH6>
+	  dzl v00,9600.,n,002,8,<Test-DZ01-CH7>
+	  >
+  >
+
+defdev chs,chsncp,<
+  ;;;	chsncp maxsubnet,maxconnections
+	chsncp 172,      20
+  >
+
+.endc system 777
+
 	.sbttl	System xyzzy: System xyzzy
 .if z system-xyzzy
 	.title	xyzzy