Source : Free On-Line Dictionary of Computing

a1
     
         Address 1 code.
     
        An a1 code {interpreter}, by Matthew Newhook
         was used to test compiler output.  It
        requires {gcc} 2.4.2 or higher and is portable to computers
        with {memory segment} protection.
     
        {(ftp://ftp.cs.mun.ca/pub/a1)}.
     
        (1994-07-19)