Ed - the source code

[colorful rounded image of the Head of a GNU] 

while :;do read x;echo \?;done

Here is the source code in x86 assembly and dos (submitted by Nate)
-----------------------------------------------------------------
[ORG 0x100]
top:  mov ah,0x0a
      mov dx, buffer
      int 0x21
      mov ah, 0x09
      mov dl,message
      int 0x21      
      jmp short top
message:
         db 10,'?',13,10,'$'
buffer:
------------------------------------------------------------

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Updated: 8 Apr 2000 tower