--- /dev/null
+MAIN START
+ OUT STRT,L1
+LOOP IN IOBUF,IOLEN
+ LD GR1,IOLEN
+ JZE FIN
+ OUT TYPD,L2
+ OUT IOBUF,IOLEN
+ OUT WHTNXT,L3
+ JUMP LOOP
+FIN RET
+;;; メッセージと長さ
+STRT DC 'LET''S START. TYPE IN'
+L1 DC 20
+TYPD DC 'YOU TYPED'
+L2 DC 9
+WHTNXT DC 'WHAT''S NEXT?'
+L3 DC 12
+;;; 入出力領域
+IOBUF DS 64
+IOLEN DS 1
+ END