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Section 4: Programming 1 50
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For ease of recognition, the digit keys 0, . . . , 9 are displayed as 00, . . . , 09. You can
now read the remaining contents of memory.
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Press
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See Displayed
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Comment
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Represents LBL.
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SST
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Represents A.
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SST
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Represents g.
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SST
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Represents 1/x .
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SST
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Represents RTN.
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Etc.
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Etc.
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Thus, starting at the top, you can now see that the first live codes (23, 11, 35, 04, 24)
represent the default function defined for the top row A key. This function, LBL A g1/x RTN,
does nothing more than compute the reciprocal of x.
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The SST key is discussed in Figure 4-1. Note that SST is used also in RUN mode to
execute a program, one step at a time.
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Also, note that to conserve memory, the most frequently used prefix-suffix pairs are each merged into
single codes. Thus, gLSTX is encoded and displayed as:
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Control Operations
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In creating a program, you take into account how it is to be started and how it is to stop.
You may recall that in the function created in the Introduction, you put a label (LBL A)
ahead of the actual calculating steps so that the beginning of the program could be found. You also
put a return (RTN) at the end so that the program could stop itself:
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LBL A ENTER ENTER × × RTN
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Notice that 35, representing the g prefix, determines that the next code 04 be interpreted as
1/x, the blue alternate function on the 4 key.
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