Search found 6 matches

by eulerfan
Fri Sep 21, 2018 9:47 am
Forum: DM42
Topic: Bigger ALPHA register
Replies: 33
Views: 5402

Re: Bigger ALPHA register

Yeah, that program memory was so small that after a while I knew several of the more useful programs by heart (the root finder and moon rocket lander come to mind). I never tried to memorize any programs; it was usually easier to write them as needed. One thing I disliked about the -25 was that my ...
by eulerfan
Thu Sep 20, 2018 2:38 pm
Forum: DM42
Topic: Bigger ALPHA register
Replies: 33
Views: 5402

Re: Bigger ALPHA register

Programmable HP calculators have done that at least since the HP-25! I actually owned an HP-25 and never noticed the feature. :lol: That's really weird! :shock: I dug a bit and that feature was, in fact, first introduced in the HP-25: One innovative feature of the HP-25 is the behavior of the SST (...
by eulerfan
Thu Sep 20, 2018 3:00 am
Forum: DM42
Topic: Bigger ALPHA register
Replies: 33
Views: 5402

Re: Bigger ALPHA register

It already does that. Press and hold SST and it will show you the line that's about to be executed. I just tried this on my brand new DM42 (Free42 2.0.21), and it works! Thanks. Programmable HP calculators have done that at least since the HP-25! I actually owned an HP-25 and never noticed the feat...
by eulerfan
Wed Sep 19, 2018 1:22 pm
Forum: DM42
Topic: Bigger ALPHA register
Replies: 33
Views: 5402

Re: Bigger ALPHA register

I was debugging some code in Free42 today, and at one point it did occur to me that having "step over" and "step out" would be nice. SST is really "step into" and that's not always what you want. Those wouldn't be hard to implement. But where to put on the keyboard? :D How about two consecutive XEQ...
by eulerfan
Wed Aug 29, 2018 10:29 am
Forum: Usage tips, tricks and problem reports
Topic: Solver bug for secondary roots?
Replies: 2
Views: 445

Re: Solver bug for secondary roots?

Thanks for the quick answer. You're right, ENTER does disable stack lift, even in a running program. My old, worn out HP-15C does this too. I never noticed it in all the years I've been using HP calculators. Strange. If I do as you say (remove the ENTER and replace the X<>Y with RCL "X"), the Solver...
by eulerfan
Wed Aug 29, 2018 12:44 am
Forum: Usage tips, tricks and problem reports
Topic: Solver bug for secondary roots?
Replies: 2
Views: 445

Solver bug for secondary roots?

While waiting for my DM42 to arrive (it's a long way from Switzerland to Canada!) I've been refreshing my memory of the HP-42S by playing with the Free42 program on my Linux box. I've tried using the Solver on the following program for (x - 7)(x - 11) = 0 : 00 { 25-byte Prgm } 01 LBL "QUAD" 02 MVAR ...