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<br />some machines this may be desirable. A simple overlay scheme that <br />will increase program efficiency and will slightly reduce core <br />storage requirements (from 32K to 30K) is shown in Diagram B. The <br />routines shown at the top of the diagrams reside in core the entire <br />time the program is in execution. The remaining subprograms are <br />divided into three parts, each of which is in core only while it <br />is needed. This also allows the blank common storage area to be <br />changed in different sections. For this reason, users may wish to <br />take advantage of overlaying the program. On small machines much <br />more extensive overlaying will be required at significant expense <br />to the user in both programmer and execution time. <br />Figure 7, on page 36, may provide additional insight to programmers <br />desiring to overlay the program. <br /> <br />34 <br />