Reset / Delete all registers

Reset / Delete all registers

Postby Stephan1961 » Sat Jan 23, 2021 9:40 am

Hi, this is Stephan from Germany.
I recently bought a used HP41CV in pretty good condition, but am an absolute beginner with HP41.
Always wanted to try out HP since I could never afford during studies, where I used TI 59.
Obviously I'm struggling bit with the handbook.

If I switch into the PRGM mode, I see 00 - REG 45.
I guess I already stored some program code.
So, I want to clear everything, but if I use CLRG it remains as is.
Or what is the correct instruction?

Is there a way to kind of reset the whole thing? Delete all registers or similar?

Help is much appreciated.

Thanks Stephan
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Re: Reset / Delete all registers

Postby Garth » Sat Jan 23, 2021 7:01 pm

Welcome! I started out with a TI-58c in Dec '81 also, and quickly outgrew its memory limitation, and was in the right place at the right time to trade my 58c + $100US for a barely used TI-59 and printer and four modules (including the EE module! :D ) and some TI-58/59 books. I quickly outgrew the 59 also, and had one program that prompted for cards when it needed a part that did not fit in memory at the same time, kind of like disc-swapping. I stepped up to the 41cx in 1986 so I could control equipment with it through HP-IL.

The 00 is telling you that you have not entered any instructions yet in the current program. The 45 is telling you how many registers are still available for programming. Multiply that by seven to get the number of bytes. The reason it's not 319 when it's empty is that the rest are set to be used as data registers. You can change the number of data registers, by using the SIZE command. I keep mine rather small (26 at the moment, but usually less than that) because I have so many programs in main memory and none of them need very many data registers.

The manuals are extremely well written, but I think you need to start at the front cover and read through things in order, rather than jumping around or just looking things up. When I got my 41cx in 1986, I just read through everything in order, and when I got to the end, I felt like I knew the machine quite well, even though I never got to "the hard part," because there was no "hard part."
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Re: Reset / Delete all registers

Postby Stephan1961 » Sat Jan 23, 2021 9:00 pm

Thanks for the encouraging words; yeah - guess I have to be a bit more patient and read more in detail.
Understood your explanation on the display.
But when I received the HP41 it was saying 00-REG-46 instead of 45.
So I was wondering what I did, but maybe I re-sized accidentally.
Will check tomorrow.
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