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Programming an HP-15C (2013)

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Re: Programming an HP-15C (2013)

#3

Post by edeion »

Given how hard it can be for me to focus when the web is just one click away, these dedicated tools are such a boon. Plus the hacker touch of these programming languages has something lovely.

(I don't get what's so funny with the 38x3, though...)

Re: Programming an HP-15C (2013)

#4

Post by cr0sh »

edeion wrote: post #3

Given how hard it can be for me to focus when the web is just one click away, these dedicated tools are such a boon. Plus the hacker touch of these programming languages has something lovely. (I don't get what's so funny with the 38x3, though...)

Yeah - I'm not mathematically inclined enough to understand what would be so funny about the 38x^3 denominator either?

Unless it's something that would cause an error due to memory/register size constraints, or cause the calculator to sit there forever on some of the other larger squares or test values due to 1986 speed of the ALU or whatever is in the calc?

My gut assumption is that it's some mathematics inside joke of some sort...

Re: Programming an HP-15C (2013)

#5

Post by krallja »

cr0sh wrote: post #4
edeion wrote: post #3

Given how hard it can be for me to focus when the web is just one click away, these dedicated tools are such a boon. Plus the hacker touch of these programming languages has something lovely. (I don't get what's so funny with the 38x3, though...)

Yeah - I'm not mathematically inclined enough to understand what would be so funny about the 38x^3 denominator either? Unless it's something that would cause an error due to memory/register size constraints, or cause the calculator to sit there forever on some of the other larger squares or test values due to 1986 speed of the ALU or whatever is in the calc? My gut assumption is that it's some mathematics inside joke…

All of the other constants are expected. 1, 2, 9, 10 ok those make sense. Where does 38 come from? Ha ha. So random.

Re: Programming an HP-15C (2013)

#6

Post by mjd »

krallja wrote: post #5
cr0sh wrote: post #4

Earlier quoted context omitted.

Yeah - I'm not mathematically inclined enough to understand what would be so funny about the 38x^3 denominator either? Unless it's something that would cause an error due to memory/register size constraints, or cause the calculator to sit there forever on some of the other larger squares or test values due to 1986 speed of the ALU or whatever is in the calc? My gut assumption is that it's some mathematics inside joke…

All of the other constants are expected. 1, 2, 9, 10 ok those make sense. Where does 38 come from? Ha ha. So random.

I could not have put it better myself.

Re: Programming an HP-15C (2013)

#8

Post by drivers99 »

Wow that sounds a lot more complicated than the one I had, HP 42S, because you had to use codes for the instructions instead of just pulling up the instructions in readable ASCII.

I found this random example of entering a program on a 42S: https://www.youtube.com/watch?v=JQMOOxup8bI Coincidentally, it even uses the FP (fractional part) and X=0? test that the OP mentioned.

I wanted to see what programming the 15C looked like, so I found this as well: https://www.youtube.com/watch?v=m4dF5nF8I88 Looks like you can enter the program without knowing the codes, but reviewing the code just shows codes.

Re: Programming an HP-15C (2013)

#9

Post by drivers99 »

gshubert17 wrote: post #7

I think the "someone who brought it back" is Swiss Micros, which makes a compatible calculator (which they call DM-15) as well as other models in the same family. They say their chip that emulates the original cpu is quite a bit faster than the original. https://www.swissmicros.com

Wow they also have one based on the 42S.
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