HP Forum Archive 14

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different hp-45 versions? Message #1 Posted by linter on 26 Jan 2004, 2:22 p.m. I seem to have two different versions of the HP-45. On one of them the sides run around the perimeter of top with no variation but on another, at about halfway down the screen, there's a bevel in the plastic on both sides. Is one earlier or rarer than the other?

Re: different hp-45 versions? Message #2 Posted by Monte Dalrymple on 26 Jan 2004, 2:42 p.m., in response to message #1 by linter If it's like my HP-45 the bevels are wear marks from carrying the calculator in the optional hard leather belt case. I paid more for my 45 than I did for a quarter's registration fees at UC Berkeley, so during my years at Berkeley the calculator was either in the hard case on my belt or in my hands. I dug a lot of ditches to pay for that machine, and I still have it (and of course it still works).

Re: different hp-45 versions? Message #3 Posted by Arnaud Amiel on 26 Jan 2004, 5:05 p.m., in response to message #1 by linter As indicated the bevels may be worn marks. However I have 2 different types of 45s. One comes with a metal bar below the screen instead of chrome plating. On this one ON/OFF is printed in yellow. The other does not have the metal bar and is chrome plated all around and has ON/OFF molded in the brow plastic. I however don't know if there are some molded on/off with metal bar or some printed on/off without the metal bar Arnaud

Re: different hp-45 versions? Message #4 Posted by Andrés C. Rodríguez (Argentina) on 26 Jan 2004, 7:36 p.m., in response to message #1 by linter On the firmware side, there were at least two variants of HP 45, which differed in the operand sequence for recall arithmetic. For instance, if Register 1 contains a 5 and the X register contains a 3... In some calculators, RCL - 1 gives 2 (i.e.: X - R1 -> 5 - 3) In others, RCL - 1 gives -2 (i.e.: R1 - X -> 3 - 5) The same change of order affects division, of course, there si no difference for addition and multiplication.

Re: different hp-45 versions? Message #5 Posted by Veli-Pekka Nousiainen on 31 Jan 2004, 8:22 p.m., in response to message #4 by Andrés C. Rodríguez (Argentina) "The same change of order affects division, of course, there si no difference for addition and multiplication." What about LASTX ? [VPN]

Re: different hp-45 versions? Message #6 Posted by Andrés C, Rodríguez (Argentina) on 1 Feb 2004, 7:16 a.m., in response to message #5 by Veli-Pekka Nousiainen We were talking about recall arithmetic, which avoids stack lifts. As one of the arguments is still in one register (say R1), the only reasonable use of Last X is to hold the previous X value (the one before the recall artitmetic operation), independently of order. Sadly, I don't have a 45 on hand to check this out.

RCL arithmetic and Last X Message #7 Posted by Andrés C. Rodríguez (Argentina) on 1 Feb 2004, 7:35 a.m., in response to message #5 by Veli-Pekka Nousiainen VPN: At least in the HP42S (the only recall arithmetic enabled model I have on hand) the behavior of LastX is just to keep the previous X value, so there is no order issues for Last X in recall arithmetic. Regards

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