Definitions

Brief Code

Short Code (computer language)

Short Code was one of the first higher-level languages ever developed for an electronic computer. Unlike machine code Short Code statements represented mathematic expressions rather than a machine instruction.

Short Code was proposed by John Mauchly in 1949 and originally known as Brief Code. William Schmitt implemented a version of Brief Code in 1949 for the BINAC computer, though it was never debugged and tested. The following year Schmitt implemented a new version of Brief Code for the Univac I where it was now known as Short Code (also Short Order Code). A revised version of Short Code was developed in 1952 for the Univac II by A. B. Tonik and J. R Logan.

While Short Code represented expressions, the representation itself was not direct and required a process of manual conversion. Elements of an expression were represented by two-character codes and then divided into 6-code groups in order to conform to the 12 byte words used by BINAC and Univac computers. For example the expression:

a = (b+c)/b*c

was converted to Short Code by a sequence of substitutions and a final regrouping:

X3 =  ( X1 +  Y1 )  /  X1 * Y1   substitute variables
X3 03 09 X1 07 Y1 02 04 X1   Y1   substitute operators and parentheses.
                                       Note multiplication is represented
                                       by juxtaposition.
07Y10204X1Y1                      group into 12-byte words.
0000X30309X1

Along with basic arithmetic, Short Code allowed for branching and calls to a library of functions. The language was interpreted and ran about 50 times slower than machine code.

See also

History of programming languages

Notes

References

  • Wexelblat, Richard L. (Ed.) (1981). History of Programming Languages, p. 9. New York: Academic Press. ISBN 0-12-745040-8
  • Murdoch, Short Code (HOPL)

External links

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