HP-41 undocumented features Message #1 Posted by Jimmy on 20 Mar 1999, 8:36 p.m.
I know this subject has been done to death but I have never seen anything about these "features" of the HP-41. 1st feature procedure : in alpha register, write anything (1 to 12 char. maximum) in program mode, write a loop (make a slow one, like this exemple) : LBL 'AA GTO 'AA Get out of program mode, position the calculator on LBL 'AA, do XEQ 'PROMPT Now do the following, exactly : press SHIFT (and hold) press CLX (and hold) press ON (and release all) you will see the PRGM indicator light up. Now press CLX. If you have followed the procedure, you should see your alpha string moving from left to right. If you use a faster loop like "LBL 00, GTO 00" or better yet, "LBL A, GTO A", the display will go faster. ----------------------------------------------------------- 2nd feature procedure : in program mode, write the following : LBL 00 TONE 9 GTO 00 get out of program mode and do XEQ 00. Now do the following : press CLX (and hold) press ON At this point, this is touch and go. If you're lucky, your HP-41 should emit a very high-pitch sound, if not, run the program again and again, until you get it. At this point, your HP-41 will make this sound each time you touch a key. You can get rid of this sound by making the calculator beep (using BEEP or TONE). If you turn the calculator off and then on, the sound will still be there. ----------------------------------------------------------- Any of you knew about those? got more "undocumented features"? Hope this helpful for somebody or, at least, fun! Jimmy
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