HP Forum Archive 16

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AECrom register usage Message #1 Posted by Geir Isene on 18 Apr 2006, 7:32 a.m. The AECrom manual says that the curve fitting program needs Size 56 to collect all the sums. It specify register usage up and including register 42, leaving the registers 43-55 unexplained. Since I do not have an AECrom (I'm getting a Clonix soon, but as we know Diego is busy), can anyone with an AECrom shed som light on what the registers 43-55 are used for?

Re: AECrom register usage Message #2 Posted by Vieira, Luiz C. (Brazil) on 20 Apr 2006, 12:25 a.m., in response to message #1 by Geir Isene Hi, Geir; I have the AECROM image loaded in the NoVRAM (programmed as low-power Clonix) and I ran the example at page #49 in the manual. After entering each data I VIEWed each of the registes' contents from R55 to R43 and they had nothing but 0.0000. After pressing [D] (find the best curve fit) I found the following contents: (FIX 9) R Contents 55 -6.748806730 54 10,408.00000 53 830.0000000 52 2.000000000 51 3,212.000000 50 33.85502276 49 30,406.00000 48 -4.580173552 47 6.574829560 46 -22.96950673 45 -50.00000000 44 6.420402010 43 370.0000000 I did not try to relate these values with the input data, but I guess that with a smaller sample (maybe three points only) we could `see` the relation faster. In any case, if the manual states that 56 reguisters are needed and CURVE has one single program line to make sure it's been set so (line #05: STO 55), then I'd guess they are some sort of 'scratch pad'. The HP15C uses some registers as scratch area (up to 24) when numerically computing SOLVE and Integrate, so... If you need any particular test, just let us know. Cheers. Luiz (Brazil)

Re: AECrom register usage Message #3 Posted by Geir Isene on 20 Apr 2006, 8:15 a.m., in response to message #2 by Vieira, Luiz C. (Brazil) This was very good info. Thank you very much.

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