diff --git a/src/system/its.1650 b/src/system/its.1650
index 954b8858..068b1488 100644
--- a/src/system/its.1650
+++ b/src/system/its.1650
@@ -318,6 +318,17 @@ T!N!$TCT==TCT
 T!N!$ROL==ROL
 TERMIN
 
+;DEFINE TTY AS VT100
+DEFINE TTDVT100 N,+SPEED=9600,ISPEED=,TT=0,TY=0,TO=0,TP=%TPORS+%TPMTA,HOR=80.,VER=24.,TCT=%TNAAA,ROL=1,SMARTS=0
+T!N!$SMT==SMARTS,,
+T!N!$HOR==HOR
+T!N!$VER==VER
+T!N!$OPT==TO+%TOMVU+%TOMVB+%TOLWR+%TOERS+%TOLID+%TOCID,,TP+%TPPTB*2
+T!N!$TYP==TT+<SPEEDC ISPEED,SPEED>,,TY+<CNTRLR N>
+T!N!$TCT==TCT
+T!N!$ROL==ROL
+TERMIN
+
 ;DEFINE TTY AS C100
 DEFINE TTDC100 N,+SPEED=9600,ISPEED=,TT=0,TY=0,TO=0,TP=%TPORS,HOR=79.,VER=24.,TCT=%TNHDS,ROL=1,SMARTS=0
 T!N!$SMT==SMARTS,,