diff --git a/Makefile b/Makefile
index 9d867cb3..b5afeeb2 100644
--- a/Makefile
+++ b/Makefile
@@ -6,7 +6,7 @@ include conf/network
 SRC = system syseng sysen1 sysen2 sysen3 sysnet kshack dragon channa	\
       midas _teco_ emacs emacs1 rms klh syshst sra mrc ksc eak gren	\
       bawden _mail_ l lisp libdoc comlap lspsrc nilcom rwk	\
-      inquir acount gz sys decsys ecc alan sail kcc kcc_sy c
+      inquir acount gz sys decsys ecc alan sail kcc kcc_sy c lars
 DOC = info _info_ sysdoc sysnet syshst kshack _teco_ emacs emacs1 c kcc
 BIN = sys2 device emacs _teco_ lisp liblsp alan inquir sail comlap c
 
diff --git a/src/lars/deuna.113 b/src/lars/deuna.113
new file mode 100644
index 00000000..46b140ec
--- /dev/null
+++ b/src/lars/deuna.113
@@ -0,0 +1,56 @@
+TITLE DEUNA - poke at a DEUNA
+
+.insrt kshack; ksdefs >
+
+a=1
+b=2
+c=3
+p=17
+
+.insrt system; dedefs >
+
+go:
+	move p,[-100,,pdl]
+
+	seto a,			;Enable user I/O
+	.iotlsr a,
+
+	movei a,%drset		;Reset DEUNA
+	iowri a,%decr0
+	pushj p,wait
+
+	movei a,%dinte		;Enable interrupt
+	iowri a,%decr0
+
+	setz a,			;Clear PCSR2 and 3
+	iowri a,%decr2
+	iowri a,%decr3
+
+	movei a,%dinte+%dgpcb	;Command Get PCB block
+	iowri a,%decr0		;Expect an interrupt
+
+	.call [setz		;Get a locked page.
+		sixbit /CORBLK/
+		movei %cbndr ;+%cblok
+		movei %jself ? movei page
+		movei 400000 ? setzi 100] ;%jsnew
+	 .lose
+done:	jfcl
+	.call [setz
+		sixbit /CORTYP/
+		movei %jself ? movei page
+		movem a ? movem b ? setzm c]
+	 .lose
+
+	.logout 1,
+
+wait:	iordi a,%decr0		;Wait for interrupt bit
+	trnn a,%dintr
+	 jrst wait
+	popj p,
+
+pdl:	block 100
+
+page==<.+1777>_-12
+
+end go
diff --git a/src/lars/deuna.51 b/src/lars/deuna.51
new file mode 100644
index 00000000..749c4626
--- /dev/null
+++ b/src/lars/deuna.51
@@ -0,0 +1,53 @@
+TITLE DEUNA - poke at a DEUNA
+
+.insrt kshack; ksdefs >
+
+a=1
+p=17
+
+%devec==120		;Interrupt vector
+
+%debas==774510		;Register base address, on UBA3
+
+%decr0=%debas		;PCSR0
+ %dgpcb==0001		;Get PCB block
+ %dstrt==0004		;Start
+ %drset==0040		;Reset
+ %dinte==0100		;Enable interrupts
+ %dintr==0200		;Interrupt
+ %ddni ==4000		;Done
+
+%decr1==%debas+2	;PCSR1
+%decr2==%debas+4	;PCSR2
+%decr3==%debas+6	;PCSR3
+
+go:
+	move p,[-100,,pdl]
+
+	seto a,			;Enable user I/O
+	.iotlsr a,
+
+	movei a,%drset		;Reset DEUNA
+	iowri a,%decr0
+	pushj p,wait
+
+	movei a,%dinte		;Enable interrupt
+	iowri a,%decr0
+
+	setz a,			;Clear PCSR2 and 3
+	iowri a,%decr2
+	iowri a,%decr3
+
+	move a,%dinte+%dgpdb	;Command Get PCP block
+	iowri a,%decr0		;Expect an interrupt
+
+	.logout 1,
+
+wait:	iordi a,%decr0		;Wait for interrupt bit
+	trnn a,%dintr
+	 jrst wait
+	popj p,
+
+pdl:	block 100
+
+end go
diff --git a/src/lars/deuna.57 b/src/lars/deuna.57
new file mode 100644
index 00000000..7c6795de
--- /dev/null
+++ b/src/lars/deuna.57
@@ -0,0 +1,39 @@
+TITLE DEUNA - poke at a DEUNA
+
+.insrt kshack; ksdefs >
+
+a=1
+p=17
+
+.insrt system; dedefs >
+
+go:
+	move p,[-100,,pdl]
+
+	seto a,			;Enable user I/O
+	.iotlsr a,
+
+	movei a,%drset		;Reset DEUNA
+	iowri a,%decr0
+	pushj p,wait
+
+	movei a,%dinte		;Enable interrupt
+	iowri a,%decr0
+
+	setz a,			;Clear PCSR2 and 3
+	iowri a,%decr2
+	iowri a,%decr3
+
+	movei a,%dinte+%dgpcb	;Command Get PCB block
+	iowri a,%decr0		;Expect an interrupt
+
+	.logout 1,
+
+wait:	iordi a,%decr0		;Wait for interrupt bit
+	trnn a,%dintr
+	 jrst wait
+	popj p,
+
+pdl:	block 100
+
+end go