diff --git a/README.md b/README.md
index 6b7b8209..db326ffb 100644
--- a/README.md
+++ b/README.md
@@ -134,6 +134,7 @@ There's a [DDT cheat sheet](doc/DDT.md) for Unix users.
    - SPELL, ESPELL spell checker.
    - SRCCOM, Compares/merges source files, compares binary files.
    - STINK, linker.
+   - STY, pseudo-terminal for multiple sessions.
    - SUPDUP, Supdup client.
    - SYSMSG, displays system messages.
    - TALK/WHO/WHOJ/WHOM/USERS, list users.
diff --git a/build/build.tcl b/build/build.tcl
index 87f8825c..a050dd3f 100644
--- a/build/build.tcl
+++ b/build/build.tcl
@@ -810,6 +810,10 @@ respond "*" "nlinks+14/ A,,646471\r"
 type ":pdump sys1;ts prufd\r"
 respond "*" ":kill\r"
 
+# STY
+respond "*" ":midas sys1;ts sty_sysen2;sty\r"
+expect ":KILL"
+
 # ndskdmp tape
 respond "*" ":link kshack;good ram,.;ram ram\r"
 respond "*" ":link kshack;ddt bin,.;@ ddt\r"
diff --git a/src/sysen2/sty.25 b/src/sysen2/sty.25
new file mode 100644
index 00000000..c979ce9e
--- /dev/null
+++ b/src/sysen2/sty.25
@@ -0,0 +1,92 @@
+TITLE PSEUDO-TTY HACK
+
+A=1
+B=2
+C=3
+D=4
+P=17
+
+TYI==1
+TYO==2
+PYI==3
+PYO==4
+
+GO:	MOVEI P,PDL-1
+	.SUSET [.SMSK2,,[1_TYI+1_PYI+1_TYO]]
+	.OPEN TYI,[SIXBIT /  $TTY/]
+	 .LOSE %LSFIL
+	.OPEN TYO,[SIXBIT /  %TTY/]
+ 	 .LOSE %LSFIL
+	.OPEN PYI,[SIXBIT /   STY/]
+	 .LOSE %LSFIL
+	.OPEN PYO,[SIXBIT /  %STY/]
+	 .LOSE %LSFIL
+	.IOT PYO,[^Z]
+	JFCL
+	.HANG			;WAIT, AND WAIT, AND WAIT...
+
+
+ZZ==.
+LOC 42
+	JSR TSINT
+LOC ZZ
+TSINT:	0
+	0
+	MOVE B,TSINT
+	TRNE B,1_TYO
+	 PUSHJ P,MORINT
+	TRNE B,1_TYI
+	 PUSHJ P,INTYI
+	TRNE B,1_PYI
+	 PUSHJ P,INPYI
+	.DISMISS TSINT+1
+
+INPYI:	PUSH P,TSINT+1
+	.SUSET [.SDF2,,[1_PYI]]
+	.SUSET [.SPICLR,,[-1]]
+LP:	.IOT PYI,C
+	JUMPL C,OUT		;THAT WASN'T REALLY A CHARACTER
+	.IOT TYO,C
+	JRST LP
+
+CPOPJ:	POPJ P,
+
+INTYI:	PUSH P,C
+	MOVEI C,TYI
+	.ITYIC C,
+	 JRST POPCJ		;NOT REALLY A CHARACTER THERE
+	.IOT TYI,C
+	.IOT PYO,C
+	JRST POPCJ
+
+OUT:	.SUSET [.SPICLR,,[0]]
+	.SUSET [.SDF2,,[0]]
+	POP P,TSINT+1
+	POPJ P,
+
+MORINT:	PUSH P,C
+	MOVEI C,[ASCIZ /--MORE--/]
+	PUSHJ P,TYPSTR
+	.IOT TYI,C
+	PUSH P,C
+	MOVEI C,[ASCIZ /
+/]
+	PUSHJ P,TYPSTR
+	POP P,C
+	CAIE C,40
+	 CAIN C,177
+	  CAIA
+	.IOT PYO,C
+POPCJ:	POP P,C
+	POPJ P,
+
+TYPSTR:	HRLI C,440700
+TYPST1:	ILDB D,C
+	JUMPE D,CPOPJ
+	.IOT TYO,D
+	JRST TYPST1
+
+PDL:	BLOCK 50
+
+END GO
+
\ No newline at end of file