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Part of the motivation of this project was supplied by the desire to incorporate speech synthesis into Computer Aided Learning/Computer Based Training (CAL/CBT) software. It has long been recognized that putting too much information on the screen is counter productive. There is also the problem of describing graphical output as it appears on the screen. With speech synthesis, another channel of communication is provided which can be used for describing what's happening on the screen as it appears. It was intended, therefore, to link the JSRU software into a CAL program to investigate the use of speech synthesis in a CAL environment. The JSRU software was written in RTL/2 and this language allows FORTRAN and ASSEMBLY language modules to be linked into it. However, we required to link from FORTRAN into RTL/2 and this proved to be impossible to implement in any easy manner. Consequently it was decided to convert the RTL/2 into a language which could easily be linked to from other programming languages such as FORTRAN, PASCAL, etc. and clearly C was the obvious language to use for such a project. This would also have the advantage of making the JSRU software available on virtually any machine and thus be of use to the speech research community. Because the actual synthesizer communicates over a parallel interface and is critically dependent on the timing, then the interface between the computer and the synthesizer is hardware dependent. It was decided to use the IBM PC because of its wide acceptability by PC users.