DAP FORTRAN - Programming language

DAP FORTRAN is a programming language created in 1975.

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49Years Old

DAP FORTRAN was an extension of the non IO parts of FORTRAN with constructs that supported parallel computing for the ICL Distributed Array Processor (DAP). The DAP had a Single Instruction Multiple Data (SIMD) architecture with 64x64 single bit processors. DAP FORTRAN had the following major features: It had matrix and vector operations. Read more on Wikipedia...

DAP FORTRAN Wikipedia page
DAP FORTRAN first developed in International Computers Limited
DAP FORTRAN on HOPL

Example from Wikipedia:

C     Multiply vector by matrix
      REAL M(,), V(), R()
      R = SUM(M*MATR(A))

C     Converge to a Laplace potential in an area
      REAL P(,), OLD_P(,)
      LOGICAL INSIDE(,)
      DO 1 K = 1, ITERATIONS
      OLD_P = P
      P(INSIDE) = 0.25*(P(,+)+P(,-)+P(+,)+P(-,))
      IF (MAX(ABS(P-OLD_P)) .LT. EPS) RETURN
    1 CONTINUE