HP HP-15C - Page 96

96 Section 8: Program Branching and Controls
Keystrokes
Display
| ¥
000-
Program mode.
´ bB
001-42,21,12
Start at "B" if payments to be
made at the beginning.
| " 0
002-43, 5, 0
Flag 0 clear (false); indicates
advance payments.
t 1
003- 22 1
Go to main routine.
´ b E
004-42,21,15
Start at "E" if payments to be
made at the end.
| F 0
005-43, 4, 0
Flag 0 set (true); indicates
payment in arrears.
´ b 1
006-42,21, 1
Routine 1 (main routine).
O1
007- 44 1
Stores i (from X-register).
1
008- 1
+
009- 40
(1+i).
®
010- 34
Puts n in X; (l + i) in Y.
“
011- 16
 n.
y
012- 14
(1 + i)
-n
.
“
013- 16
 (1 + i)
-n
.
1
014- 1
+
015- 40
1  (1 + i)
-n
.
l ÷ 1
016-45,10, 1
Recall division with R
1
(i) to
get [l (l + i)
-n
]/i.
*
017- 20
Multiplies quantity by P.
| ? 0
018-43, 6, 0
Flag 0 set?
| n
019- 43 32
End of calculation if flag 0 set
(for payments in arrears).
l 1
020- 45 1
Recalls i.
1
021- 1
+
022- 40
(1 + i).
*
023- 20
Multiplies quantity by final
term.
| n
024- 43 32
End of calculation if flag 0
clear.