Section 10: The Index Register and Loop Control 111
False (nnnnn
xxx)
True (nnnnn
xxx)
instruction
´ s V
loop
t.
1
instruction
exit loop
For e: given nnnnn.xxxyy, decrement nnnnn to nnnnn − yy,
compare it to xxx, and skip the next program line if the new value
satisfies nnnnn ≤ xxx. This allows you to exit a loop at this point when
nnnnn becomes less than or equal to xxx.
For example, loop iterations will alter these control numbers as follows:
Iterations
Operation 0 1 2 3 4
I
0.00602 2.00602 4.00602 6.00602 8.00602
(skip next
line)
e
6.00002 4.00002 2.00002 0.00002
(skip next
line)
Examples
Examples: Register Operations
Storing and Recalling
Keystrokes Display
´ CLEAR Q
Clears all storage registers.
12.3456
12.3456
O V
12.3456
Stores in R
I
.
7 ¤
2.6458
O %
2.6458
Storage in R
.2
by indirect
addressing (R
I
= 12.3456).
l V
12.3456
Recalls contents of R
I
.
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