diff --git a/build/h3text.2016 b/build/h3text.2016
index aec89940..461db1b9 100644
--- a/build/h3text.2016
+++ b/build/h3text.2016
@@ -119,6 +119,7 @@ NET : 198.0.0.0 : C-198 :
 NET : 199.0.0.0 : C-199 :
 NET : 200.0.0.0 : C-200 :
 NET : 202.0.0.0 : C-202 :
+NET : 205.0.0.0 : C-205 :
 NET : 224.0.0.0 : C-224 :
 
 ;;; Historical interest
@@ -130,6 +131,8 @@ HOST : 10.3.0.54 : MC.MIT.EDU, MIT-MC, MC : PDP-10 : ITS : :
 ;;; DistriBution ITS and generic KA
 HOST : %CHAOS%%IP% : %HOSTNAME%, DB, KA, KL : PDP-10 : ITS : :
 
+HOST : 205.166.94.7 : HACTRN.ORG, HX : PDP-10 : ITS : :
+
 ;;; Global ITS and Lispm network
 HOST : CHAOS 5460, 54.174.143.211 : ES-ITS.SWENSON.ORG, ES : PDP-10 : ITS : :
 HOST : CHAOS 5461 : EX-ITS.SWENSON.ORG, EX : PDP-10 : ITS : :
diff --git a/build/pdp10-ka/config.202 b/build/pdp10-ka/config.202
index c38e726a..5e9a35f0 100644
--- a/build/pdp10-ka/config.202
+++ b/build/pdp10-ka/config.202
@@ -363,6 +363,78 @@ BODY
 TERMIN
 TERMIN
 ] ;KA
+IFE MCOND HX,[		;HACTRN.ORG KA10
+DEFOPT KA10P==1		;HAS KA PROCESSOR
+DEFOPT MAXJ==60.	;MAX NUMBER OF JOBS ALLOWED
+DEFOPT SWBLK==1		;1 => SWAP BLOCKING, 0 => PRIV USER
+DEFOPT SWPWSP==0	;NO WORKING-SET SWAP SCHEDULER
+DEFOPT PAGPRE==1	; Page-in preemption
+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
+DEFOPT RP10P==1		;HAS DEC RP10 DISK CONTROL (RP02)
+DEFOPT QRDCMP==1	;SOFTWARE READ-COMPARE
+DEFOPT DMDSK==1		;USES DM DISK FORMAT
+DEFOPT QRSRVP==1	;HAS RESERVED DISK PACKS (SECONDARY PACK)
+DEFOPT QAUTHP==1	;KEEPS TRACK OF FILE AUTHORS
+
+DEFOPT C1MXP==1         ;CHANNEL 1 MPX FEATURE
+DEFOPT NEWDTP==1	;HAS NEW DECTAPE CONTROLLER
+DEFOPT NUNITS==2	; Number of utape units (R.I.P.)
+DEFOPT NMTCS==1		;NUMBER OF MAG TAPE UNITS
+DEFOPT TM10B==1		;DF10-BASED CONTROLLER
+DEFOPT NLPTP==0		;HAS NEW LPT (ODEC)
+DEFOPT TPLP==0		;PSEUDO LPT
+DEFOPT PTRP==1		;HAS PAPER TAPE
+DEFOPT PTPP==0		; And punch works.
+DEFOPT PDCLKP==1	;"DeCoriolis" CLOCK
+DEFOPT 340P==0		;HAS 340 DISPLAY
+DEFOPT STKP==0		;Has Stanford keyboard
+DEFOPT IMXP==0		;HAS IMX (INPUT MULTIPLEXOR)
+
+DEFOPT NETP==1		; Has net connection
+DEFOPT IMPP==1		; Has IMP interface
+DEFOPT KAIMP==1
+DEFOPT IMPUS==306	; ARPA net host number
+DEFOPT IMPUS3==<IPADDR 10,3,0,6>	; Internet host number
+DEFOPT NCPP==0		; Flush NCP code
+DEFOPT NNETCH==20.	; # NCP net channels
+DEFOPT INETP==1		; Include Internet code
+DEFOPT TCPP==1		; Include TCP code
+DEFOPT XBL==20.		; # TCP network channels
+DEFOPT CHAOSP==0	;CHAOS NET
+DEFOPT MYCHAD==3114	;CHAOS NET ADDRESS
+DEFOPT NINDX==30.	;NUMBER OF INDICES
+DEFOPT CH10P==0		;CHAOS NET VIA PDP-10 I/O BUS, NOT FRONT-END
+
+DEFOPT NOTYS==1		;# KA-10 CONSOLE 0 TTYS
+DEFOPT MTYP==1		;HAS MORTON MULTIPLEX BOX
+DEFOPT NMTYS==16.	;# TTYS ON MORTON BOX
+DEFOPT NSTTYS==16.	;# STY'S (PSEUDO-TTY'S)
+
+DEFOPT TEN11P==1	;Rubin 10-11 interface
+IFDEF TEN11P,IFN TEN11P,DEFSYM T11CPA==3776000	;ADRS OF TEN-11 CONTROL PAGE
+DEFOPT TT11NM==0	; # of 10-11 PDP11 that handles TV TTYs.
+DEFOPT N11TYS==16.	; # PDP11 TV TTYS
+DEFOPT MXVBN==40	; Max video bfr # for assignment purposes.
+
+DEFOPT TSYSM==768.	;TOTAL PDP10 1K MEM BLOCKS
+DEFOPT NMMP==4		;# EXEC PAGES FOR MMP TABLE (# VIR PGS/512.)
+
+DEFSYM PMRCM==1777	;10 BIT REAL CORE ADR
+DEFSYM PMAGEM==16000	;3 BIT AGE
+DEFSYM PMCSHM==0	;NO CACHE BIT
+DEFSYM PMUNSD==160000	;UNUSED BITS
+
+DEFINE ITSIRP BODY
+IRPS ITS,,[DB]
+BODY
+TERMIN
+TERMIN
+] ;HX
 
 IFE MCOND DM,[
 DEFOPT KA10P==1		;DM HAS KA10 PROCESSOR
diff --git a/src/l/*lisp.154 b/src/l/*lisp.154
index 3ed79b52..3436dce2 100644
--- a/src/l/*lisp.154
+++ b/src/l/*lisp.154
@@ -15489,7 +15489,7 @@ IFN ITS,[
 	 .VALUE
 	SETZ A,			;CONVERT TO ATOMIC SYMBOL
 	HLRZS TT
-    IRP X,,[AI,ML,MC,MD,MX,DB,KA,KL]
+    IRP X,,[AI,ML,MC,MD,MX,DB,KA,KL,HX]
 	CAIN TT,(SIXBIT \X\)
 	 MOVEI A,Q!X
     TERMIN 
diff --git a/src/l/struct.658 b/src/l/struct.658
index aa83fea8..50f11ba4 100644
--- a/src/l/struct.658
+++ b/src/l/struct.658
@@ -715,7 +715,7 @@ PG$		MRA PAGING
 		MRA PPN
 20$ 		MRA PS
 IFN ITS,[
-		MRA [ITS,AI,ML,MC,MD,MX,DB,KA,KL]
+		MRA [ITS,AI,ML,MC,MD,MX,DB,KA,KL,HX]
 		MRA EXPERIMENTAL
 		MRA .LISP.
 ]	;END OF IFN ITS
diff --git a/src/sysen1/pword.2663 b/src/sysen1/pword.2663
index 2f0c488f..9bcc8cd7 100644
--- a/src/sysen1/pword.2663
+++ b/src/sysen1/pword.2663
@@ -9816,6 +9816,7 @@ bltspc:	syscal sstatu,[val x ? val x ? val x ? val x ? val x
 	  jrst [move x,[mdspec,,tsspec]	 ;yes, so use MD's specs
 	        blt x,spcend-1	   ;  all of them, to the end
 		ret ]
+	came x,[sixbit /HX/]	   ;is it HX?
 	camn x,[sixbit /ES/]	   ;is it ES?
 	  jrst [move x,[mdspec,,tsspec]	 ;yes, so use MD's specs
 	        blt x,spcend-1	   ;  all of them, to the end
diff --git a/src/syseng/dump.446 b/src/syseng/dump.446
index 7e066e8e..b6c12ba8 100644
--- a/src/syseng/dump.446
+++ b/src/syseng/dump.446
@@ -47,6 +47,7 @@ NEWCOD==1			; Assume a KS unless otherwise informed
 IFE MCOND MC, NEWCOD==0		;Use old code on MC KL only (running old ITS)
 IFE MCOND KA, NEWCOD==0		;Use old code on KA and KL too
 IFE MCOND KL, NEWCOD==0
+IFE MCOND HX, NEWCOD==0
 
 DEFINE SYSCAL OP,ARGS
 	.CALL [SETZ ? SIXBIT/OP/ ? ARGS ((SETZ))]
diff --git a/src/syseng/magfrm.19 b/src/syseng/magfrm.19
index e9cb24b1..fe64de98 100644
--- a/src/syseng/magfrm.19
+++ b/src/syseng/magfrm.19
@@ -60,6 +60,7 @@ DMMCHN::SIXBIT/DM/
 MCMCHN::SIXBIT/MC/
 KAMCHN::SIXBIT/KA/
 KLMCHN::SIXBIT/KL/
+HXMCHN::SIXBIT/HX/
 LMCHNTB:: OFFSET 0
 
 GO:	MOVE P,[-LPDL-1,,PDL-1]
@@ -640,7 +641,7 @@ MGDBIN:	6,,(SIXBIT /DSK/)
 	SIXBIT /MAGDMP/
 	SIXBIT /BIN/
 
-MDBFN2:	IRPS X,,[AI ML DM MC KA KL]
+MDBFN2:	IRPS X,,[AI ML DM MC KA KL HX]
 	 SIXBIT/BIN.!X/
 	TERMIN
 
diff --git a/src/system/salv.317 b/src/system/salv.317
index ca731269..8668e120 100644
--- a/src/system/salv.317
+++ b/src/system/salv.317
@@ -128,6 +128,21 @@ PRINTX /Which machine? /
 	TCMXH==55.
 	LIGHTS==4	;PI
 	];KA
+ IFCE MCHN,HX,[
+	FIRSPK==0
+	LASTPK==3
+	NUDSL==250.
+	DC10P==0
+	RP10P==1
+	RH10P==0
+	T300P==0
+	KL10P==0
+	OLPTP==0
+	NLPTP==0	;rest in pieces
+	TTLPTP==0
+	TCMXH==55.
+	LIGHTS==4	;PI
+	];KA
  IFCE MCHN,DM,[
 	FIRSPK==17.
 	LASTPK==21.
diff --git a/src/system/ttytyp.321 b/src/system/ttytyp.321
index a7e02936..4e032179 100644
--- a/src/system/ttytyp.321
+++ b/src/system/ttytyp.321
@@ -231,6 +231,26 @@ MCONDX EX,{				;;; EX
 	TTDAAA 40,SPEED=9600		;T40
 .ENDC ;}
 
+MCONDX HX,{				;;; HX
+	TTDLA36 0,TT=%TTLCL+%TT340,HOR=80.,SPEED=110	;T00 System Console
+	TTDAAA 1,SPEED=50000		;T01 Morton port 1
+	TTDAAA 2,SPEED=50000		;T02 Morton port 2
+	TTDAAA 3,SPEED=50000		;T03 Morton port 3
+	TTDAAA 4,SPEED=50000		;T04 Morton port 4
+	TTDAAA 5,SPEED=50000		;T05 Morton port 5
+	TTDAAA 6,SPEED=50000		;T06 Morton port 6
+	TTDAAA 7,SPEED=50000		;T07 Morton port 7
+	TTDAAA 10,SPEED=50000		;T10 Morton port 8
+	TTDAAA 11,SPEED=50000		;T11 Morton port 9
+	TTDAAA 12,SPEED=50000		;T12 Morton port 10
+	TTDAAA 13,SPEED=50000		;T13 Morton port 11
+	TTDAAA 14,SPEED=50000		;T14 Morton port 12
+	TTDAAA 15,SPEED=50000		;T15 Morton port 13
+	TTDAAA 16,SPEED=50000		;T16 Morton port 14
+	TTDAAA 17,SPEED=50000		;T17 Morton port 15
+	TTDAAA 20,SPEED=50000		;T20 Morton port 16
+.ENDC ;}
+
 ;NOTE: SEE COMMENT AT FRONT OF FILE FOR CONSTRAINTS ON THE COMMENTS
 ;THAT APPEAR ON THE FOLLOWING LINES. ALSO NOTE THAT LOWER CASE
 ;CHARACTERS MAY BE PRESENT IN THEM.