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I've had a lot of visitors but few comments! Let me hear from you! Email me at:
Genewright143@hotmail.com
Instructions:
1) Initialize.
Ordinary Annuity (payments at end of period), F-1, SF-1. (Clear Flag
1)
Annuity Due (payments at beginning of period), F, SF-1. (Set Flag 1)
2) Clear Registers. F, REG
3) Inputs (in any order)
N (number of periods). Press A. Display shows 0.00
PMT** (payment). Press C. Display shows 0.00
PV (present value). Press D. Display shows 0.00
FV** (future value). Press E. Display shows 0.00
** When calculating a sinking fund or periodic savings, either payment or future value (but not both) must be entered as a negative value.
4) Outputs or solve for...
I (interest rate PER PERIOD). Press B. Display shows the periodic
interest rate.
Note: This program does NOT automatically store the calculated value into the corresponding storage register!
Program Listing. Keying in HP-65 programs can be a real pain for several reasons, but especially because it doesn’t show any line numbers for each instruction. Giving HP the appropriate break (since the HP-65 WAS the first handheld programmable), it’s still hard to do. It’s especially troublesome if you make a mistake since there is no BST function to see what you just typed in. If your HP-65 keyboard is sticky, you might get several instructions inserted into the program or it might not get inserted at all. Be sure to review the listing keycode by keycode after you have it typed in. ALSO, for those of you trying to make sense of this listing, remember: the HP- 65 skipped TWO steps after each conditional test, rather than the 1 step on all other HP’s!
Explanations. X NE Y? is x not equal to y. TF-1 is test flag 1 (the same as FS? 01 on later HP’s). F is the yellow function key so labeled. g RDN is the blue shift key followed by the roll down key. g RUP is the blue shift key followed by the roll up key. For any other questions, email me.
Examples: For examples, check out the other two Time Value of Money programs I have online and input the proper values from the listed examples section.
Line Keycode Instruction 00 34 01 RCL 1 01 34 03 RCL 3 02 71 * 03 34 04 RCL 4 04 51 - 05 34 05 RCL 5 06 61 + 07 34 04 RCL 4 08 34 05 RCL 5 09 61 + 10 34 01 RCL 1 11 71 * 12 81 / 13 02 2 14 71 * 15 33 02 STO 2 16 23 LBL 17 01 1 18 34 02 RCL 2 19 01 1 20 61 + 21 33 06 STO 6 22 34 01 RCL 1 23 35 g 24 05 Y^X 25 33 07 STO 7 26 34 04 RCL 4 27 71 * 28 34 05 RCL 5 29 51 - 30 34 03 RCL 3 31 81 / 32 34 02 RCL 2 33 71 * 34 34 06 RCL 6 35 34 02 RCL 2 36 31 F 37 61 TF-1 38 34 07 RCL 7 39 71 * 40 51 - 41 34 07 RCL 7 42 51 - 43 61 + 44 35 00 g LSTX 45 34 02 RCL 2 46 81 / 47 32 F-1 48 61 TF-1 49 34 06 RCL 6 50 81 / 51 61 + 52 34 01 RCL 1 53 34 02 RCL 2 54 71 * 55 34 05 RCL 5 56 71 * 57 34 03 RCL 3 58 81 / 59 34 06 RCL 6 60 81 / 61 51 - 62 81 / 63 34 STO 64 61 + 65 02 2 66 35 g 67 06 ABS 68 43 EEX 69 42 CHS 70 06 6 71 35 22 g X<=y? 72 22 GTO 73 01 1 74 34 02 RCL 2 75 43 EEX 76 02 2 77 71 * 78 24 RTN 79 23 LBL 80 11 A 81 33 01 STO 1 82 24 RTN 83 23 LBL 84 13 C 85 33 03 STO 3 86 24 RTN 87 23 LBL 88 14 D 89 33 04 STO 4 90 24 RTN 91 23 LBL 92 15 E 93 33 05 STO 5 94 24 RTN