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HP Forum Archive 03

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tricks-n-tips page?
Message #1 Posted by tom on 10 Aug 2000, 1:26 p.m.

Sorry if this is already common knowledge, I must have re-invented these (someone else must have done them before me but I can't find a list). I'm a newbie on HP but love how adaptable these older calculators are 8^).

On a XYZT calc you can emulate 'drop' by pressing:

'CLX' then '+' (or '-')

I know roll down (Rv) does a similar thing but X goes into T, this way T is preserved and gets copied into Z.

To save battery power press '.' but to restore (nearly) where you were press '+' or '-'(the calc takes '.' as zero so adds zero to Y then drops the stack, so after doing this the X, Y and Z registers are restored).

These all work on an HP67, but I can't find anthing that tells you in the manual 8^(.

Re: tricks-n-tips page?
Message #2 Posted by Steve on 10 Aug 2000, 7:49 p.m.,
in response to message #1 by tom

There was an article in PPC about 1000 years ago (it seems) that gave the smallest (or fastest?) set of instructions to perform all permutations of the stack.

e.g. if the stack contains X Y Z T, change it to Z T X X (x contains value of Z, Y contains T, Z and T contains value of X)

If you're at all interested I could try to dig it up.

PPC Material
Message #3 Posted by Dave Hicks on 10 Aug 2000, 10:44 p.m.,
in response to message #2 by Steve

Richard Nelson has given his permission to republish PPC materials here so that would be great.

I hope that at some point, I'll get the time to post a few PPC programs in the software library.

Stack manipulation
Message #4 Posted by Steve on 12 Aug 2000, 12:48 a.m.,
in response to message #3 by Dave Hicks

For the 41C, PPC V7 N2 P22-23 lists all 256 permutations of the stack and how to do them.

For earlier calculators (HP65 etc) see C2 N6 P8 for a somewhat shorter list.

I could post images, but it would take a little time an I'm busy (too much to retype :-)

Some PPC Programs are online
Message #5 Posted by Gene on 17 Aug 2000, 4:12 p.m.,
in response to message #4 by Steve

I have several programs that appeared in PPC online at my website:

Primarily games, but ...


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