These machines were capable of running about 8 concurrent batch jobs and up to 100 concurrent demand (timesharing) users at once. During the period from 1970 to 1973 the single 1108 ran all of the academic and administrative jobs concurrently. In 1973 the administrative jobs were run on the 1106 and only academic jobs ran on the 1108.
Two important things that I developed for these systems were:
1) A so called "Batch Slot" system that allowed for scheduling and running multiple batch jobs at the same time. The released version of EXEC8 could only run one batch job at a time.
2) A JCL macro facility that allowed a file of JCL commands with parameters to be involked with a single JCL command. (Like a ".com" file on today's VMS).
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