HP Forum Archive 13

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HP-25 Prog Cose Puzzle Message #1 Posted by Gordon Dyer on 12 Oct 2003, 10:46 a.m. I have noticed that the HP-25 accepts the key combination of 15 25 in program mode (g SUM+). There is no blue key legend for this, so is it an undocumented instruction which does something? or is it a NOP? Any help would be appreciated. Thanks.

Re: HP-25 Prog Cose Puzzle Message #2 Posted by Andrés C. Rodríguez (Argentina) on 12 Oct 2003, 10:57 a.m., in response to message #1 by Gordon Dyer As fas as I recall, it is a NOP by other OpCode...

Re: HP-25 Prog Code Puzzle Message #3 Posted by Gordon Dyer on 13 Oct 2003, 8:25 a.m., in response to message #1 by Gordon Dyer Oooops! sorry about the title! Thanks for the reply, I can't see any effect of using 15 25 . Does anyone have knowledge of the ROM code?

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