HP HP-67

250 Using the I-Register for Indirect Control
Now switch to RUN mode and run the program. Press (or any
key) to stop the program after you have seen how quickly the
Fibonacci series increases. To run the program:
Slide the W/PRGM-RUN switch werem ll[[[Irun to RUN.
Press Display
B 1.00
1.00
3.00
5.00
8.00
21.00
34.00
89.00
144.00
377.00
R/S 610.00
AT
Each element in the Fibonacci series is the sum of the previous two
elements in the series.
Rapid reverse branching can be specified with numbers from —1
through —999 in the I-register. If the magnitude of the number in I
is greater than 224, the search continues backward through program
memory the number of steps specified. If you attempt to execute
dor (@ when the magnitude of the integer portion of the
negative number in I is greater than 999, the calculator displays
(Error ],
Problems
1. a. Create and load a program using (5Z) and [@ that
permits you to key in a series of values during successive
pauses. The values should be stored in storage registers Ry
through Ry, Rg, through Rge, and R, through Rg in the order
you key them in. Use the flowchart on page 251 to help you.