HP Forum Archive 16

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HP-41 program checksum Message #1 Posted by JeanMarc on 18 Apr 2006, 6:52 a.m. Hi, does anyone know how to recall the Checksum of an HP-41 program in Extended memory? ( perhaps synthetic instructions? ) Best regards, JMB

Re: HP-41 program checksum Message #2 Posted by Doug Wilder on 18 Apr 2006, 11:34 p.m., in response to message #1 by JeanMarc Hi JeanMarc, The checksum is stored as the first byte after the END. Locating it is somewhat difficult, yet EMDIR gives important data. Remember that there are two registers (overhead) used for filename and pointers. Recall of the data is another problem. One would suppose that lowering the curtain then using RCL 00 would suffice, unfortunately the RCL function normalizes (distroys) the data. The only HP module that I know of that can do a non-normalized recall is the HP-IL Development module (RG-BUFX function with lowered curtain). Best regards, Doug

Re: HP-41 program checksum Message #3 Posted by JeanMarc on 21 Apr 2006, 4:44 p.m., in response to message #2 by Doug Wilder Hi Doug, thank you for these informations. Best regards. Jean-Marc.

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