HP65 accuracy error

12162019, 11:02 PM
(This post was last modified: 12172019 11:55 PM by Don Shepherd.)
Post: #9




RE: HP65 accuracy error
(12162019 09:48 PM)SlideRule Wrote: Any hints as to the identity of the the 65 program (my curiosity)?Yes, it's a little encryption/decryption program I adapted for the 65 from a version I wrote for the 12c. For the 65, you press A to display no decimals, then press E to encrypt five 2digit numbers representing letters of your message. The encryption results in a big base 10 number from the 5 2digit numbers in base 40, and entering E decrypts the big base 10 number back into the original 2digit base 40 numbers. Except it doesn't give you the same 2digit numbers you started with because of the Y^X error. The 12c version of this program works fine. updated on Dec. 17, 2019  I modified the program below to remove the two Y^X operations and just used regular multiplication to adjust the multipliers in each loop instead of the Y^X operations, and now the program works fine. If anyone is interested, I'll post the new code. It's good to know that there is a relatively easy workaround for this problem. Here is the 65 version that does not work correctly (lowercase for ease of entry): lbl a dsp . 0 rtn lbl d (decode) sto 1 0 sto 2 sto 3 lbl 2 rcl 1 40 / sto 4 lst x x<>y frac x 10 rcl 3 y^x generates the wrong number x sto + 2 rcl 4 int sto 1 0 x=y goto 3 2 sto + 3 goto 2 lbl 3 rcl 2 rtn lbl e (encode) sto 1 0 sto 2 sto 3 lbl 1 rcl 1 100 / int sto 1 lst x frac 100 x 40 rcl 2 y^x x sto + 3 1 sto + 2 4 rcl 2 x<=y goto 1 rcl 3 rtn 

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Messages In This Thread 
HP65 accuracy error  Don Shepherd  12162019, 04:51 PM
RE: HP65 accuracy error  toml_12953  12162019, 05:26 PM
RE: HP65 accuracy error  Don Shepherd  12162019, 05:44 PM
RE: HP65 accuracy error  TomC  12162019, 06:38 PM
RE: HP65 accuracy error  SlideRule  12162019, 09:48 PM
RE: HP65 accuracy error  Don Shepherd  12162019 11:02 PM
RE: HP65 accuracy error  teenix  12162019, 06:53 PM
RE: HP65 accuracy error  Gene  12162019, 07:10 PM
RE: HP65 accuracy error  Jake Schwartz  12162019, 08:55 PM

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