A special matching facilities grant obtained from the National Science Foundation, in connection with the construction of the 107-inch reflector at McDonald Observatory, included the cost of an IBM 1800 process control computer. This computer was delivered in December, 1967, and has been in routine operation at the Observatory for slightly more than one year. The original system plan was presented as a paper at the meeting of the A.S.P. in June, 1968 and is shown in symbolic form in Figure 1. The essential features of the design were that it be advisory in nature and operate on a time-shared basis to provide assistance to the 107-inch, 82-inch and 36-inch telescopes. Facilities for automatic data acquisition were deferred until this initial plan was completed.