HP 41 - branching to local label and return stack - FINAL RESULTS AND PROGRAMS
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05-20-2019, 04:30 PM
(This post was last modified: 05-20-2019 04:41 PM by Artur - Brasil.)
Post: #4
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RE: HP 41 - branching to local label and return stack
(05-20-2019 03:00 PM)Craig Bladow Wrote: I believe 'prompt' is looking for the user to enter a number. Actually, this prompt expects: A number (data) and corresponding key - will get the register number to store this data; next will store data in it; so, will turn on a control flag and will return to menu; Just the corresponding Key pressed - will get the register number that holds the data and will display (PSE) it; so, will turn on a control flag and will return to menu; R/S - if the user informed data or get the data diplayed before, the control flag will be ON and this last variable input/viewed saved. So, pressing R/S will solve for this last variable. R/S without previous data input or data viewing - an error (BEEP) and returns to menu. It mimics the HP-12C for solvind financial data, but with some increments... Quote:Also in USER mode the top two rows of keys will directly execute routines if they have the LBL A-J in the current program.This is what I was expecting to happen and 41 actually does it, but with a big mistake: it kills the return stack, so, I can't go back to the main program! I was reading about Synthetic Programming and return stack is kept in registers a and b. If I could save these registers before the PROMPT and restore them back in the labels A, B, C ... this would be one (uggly) solution for this problem. But such routine in Synthetic Program is for big guys... ARTUR MARIO JUNIOR BRAZIL |
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