Render a graphical pattern where each pixel is colored by the value of 'x xor y' from an arbitrary color table.

 100  DATA 0,2, 6,10,5, 6, 7,15
 110  DATA 0,1, 3,10,5, 3,11,15
 120  DATA 0,8, 9,10,5, 9,13,15
 130  DATA 0,4,12,10,5,12,14,15
 140  LET C = 7
 150  POKE 768,169: REM LDA #
 160  POKE 770,073: REM EOR #
 170  POKE 772,133: REM STA
 180  POKE 773,235: REM   $EB
 190  POKE 774,096: REM RTS
 200  GR 
 210  FOR H = 0 TO 1
 220      FOR W = 0 TO 1
 230          FOR S = 0 TO C
 240              READ C(S)
 250          NEXT S
 260          FOR Y = 0 TO C
 270              POKE 769,Y
 280              LET Y1 = H * S * 2 + Y * 2
 290              FOR X = 0 TO C
 300                  POKE 771,X
 310                  CALL 768
 320                  COLOR= C( PEEK (235))
 330                  VLIN Y1,Y1 + 1 AT W * S + X
 340                  NEXT X,Y,W,H