Did the HP-65 record data?

[Dieter]

(03-22-2017 03:13 AM)Geoff Quickfall Wrote:  That sounds like a good idea.

This method was even used for some HP67/97 programs although these calculators support data cards. For instance take a look at the Stat Pac's Normal Distribution program. Card 1 stores the constants, card 2 does the calculations.

BTW, some time ago I posted a 67/97 program with a more accurate approximation where the constants are intended to be stored on a data card.

(03-22-2017 03:13 AM)Geoff Quickfall Wrote:  How many registers per digit are used.

"Registers"?!?
The HP65 can store up to 100 program steps. One step per digit, decimal comma/point, "CHS" or "EEX", so a number can require anything between 1 and 15 steps.

(03-22-2017 03:13 AM)Geoff Quickfall Wrote:  6
.
0
2
E
2
3
STO
0
(Next constant)
STO
1
(Next constant)
STO
2
.
.
.
Load data program card; hit R/S

You got the idea. ;-)

Since "STO n" is merged in a single step, each constant requires between 2 and 16 steps to store, so you can handle between 6 and 49 values (a final RTN is required). With one card, that is. ;-) But there are only 9 data registers, so in most cases the complete register set should fit on a single card.

(Edited this section since I originally made the same wrong assumption as Geoff: STO is merged and does not require two steps).

(03-22-2017 03:13 AM)Geoff Quickfall Wrote:  Then insert second program card and load the program referring to the previously loaded data. Does a new card erase the data registers? Again, got to get mine running.

I have never even touched a HP65 but I would be very, very surprised if reading a program would clear the data registers. Why should it?

Dieter