And here's a slightly more sophisticated version that mimics the animation you see on the Matrix:

      T←41 80⍴' '
      )ed T
      {⎕DL÷16⊣T∘←⎕AV[156+?80⍴54]⍪1↓(-0=?80⍴5)⊖T}⍣≡⊢0

In your Dyalog APL session, type the first two lines, put the opened edit window somewhere you can see it, then go back to the session repl and enter the third line. On Linux's terminal you use the APL+Tab key to switch between windows on the console.

For best effect, change your edit window theme to use green on black. :-)