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1981: Christmas trees – with computer program on the back


Two copies of a stylised Christmas tree, one reversed out, were produced by a computer program. The back page contained a copy of the Fortran program which produced the card. Interestingly, the program included the code to produce the copy of itself.

Front page

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First inside page

H A P P Y C H R I S T M A S - B R I A N B A R K E R

Second inside page

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Back page

PROGRAM CARDS81(PROGRAM,OUTPUT,TAPE1=PROGRAM) DIMENSION IT(55,30),IP(6,30) DATA IT /1650*"*"/ DO 1 I=5,39 J = I/5+MOD(I,5) DO 1 K=16-J,15+J 1 IT(I,K) = " " DO 2 I=40,42 DO 2 J=14,17 2 IT(I,J) = " " DO 3 I=43,51 DO 3 J=11,20 3 IT(I,J) = " " PRINT 4,IT 4 FORMAT("1",62X,"++"/123X,"+"/26(/66X,55A1) * /12X,"HAPPY CHRISTMAS",T67,55A1/66X,55A1 * /12X," - BRIAN BARKER",T67,55A1/66X,55A1 * //123X,"+") DO 5 I=1,55 DO 5 J=1,30 5 IT(I,J) = IT(I,J).XOR.("*".XOR." ") REWIND 1 READ(1,6)IP 6 FORMAT(4X,6A9) PRINT 7,((IT(56-I,J),I=1,55),(IP(I,J),I=1,6),J=1,30) 7 FORMAT(30(/7X,55A1,4X,6A9)//122X,"+"/63X,"++") STOP 11214 END


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Version 23: Revised 22 December 2008
Brian Barker