>"Small data-sets were definitely a limiting factor as well as limited computer power."
Not just small data-sets and limited computer power, but also very few libraries to help you out - although you could download something like xerion from ftp.cs.toronto.edu and join their email list, it was generally a case of retyping examples or implementing algorithms from printed textbooks. And it was all in C, presumably for performance reasons, while most of the symbolic AI folks came from Lisp or Prolog backgrounds.
Not just small data-sets and limited computer power, but also very few libraries to help you out - although you could download something like xerion from ftp.cs.toronto.edu and join their email list, it was generally a case of retyping examples or implementing algorithms from printed textbooks. And it was all in C, presumably for performance reasons, while most of the symbolic AI folks came from Lisp or Prolog backgrounds.