|Weird, Unintentional "XEQ" out to PPC ROM (HP-41CX)|
Message #1 Posted by James F. Chumbley on 23 Oct 2005, 3:14 a.m.
OK, It was my fault, and I know what I did to cause it. I pressed XEQ ALPHA CK ALPHA, and the -41CX must have executed a "jump" out to the PPC ROM and begun execution of the "CK" function (clear key assignments). What I really wanted to do was to execute the internal CLKT function, but I pressed the wrong keys by mistake. The problem is that I don't know how to reliably stop execution of the PPC's CK function (the -41CX just kept on running and running and running somehow) and eventually terminated with the "Memory Lost" error message! Well this certainly stopped execution of CK all right, but it seems to me that the program pointer was still pointing to the PPC ROM.
Here's the question: Assuming that I go back in, reload from magnetic card the now-erased program (which was erased as a result of the "Memory Lost" condition), and reassign the also now-erased user key assignment, which was only one function assigned to the "A" or 11 key, when I now press the "A" key in User mode, will the -41CX begin searching for the executable global label from within Main Memory or from within the PPC ROM?
Also, is this documented anywhere in the -41CX's manual set or within the PPC's very extensive manual? I have not quite yet completely memorized all 492 pages of the PPC manual, but I want to assure everyone that I do take it to bed with me every night.
(Sure I do.)