Post Reply 
41CL Module Dependencies
04-26-2016, 06:02 PM
Post: #1
41CL Module Dependencies
I have an early v2 HP-41CL that shipped with a ca. 2011 flash. I'm preparing to update the flash following the procedure outlined at at After transferring the YFNF 1D module onto the calculator and mapping the RAM image into port 1U, I get garbage on cat 2, right after "YFNS 2B" The calculator display flickers and the calculator locks up for a time. Pressing on/off, delete, (separately) program and alpha for a few seconds, unlocks the calculator without MEMORY LOST (Cursing does not seem to affect the final result.). There seem to be only three possibilities to explain this. Either the uploaded data is corrupt in some way, a bonehead user error has occurred, or the YFNF 1D module is in some way incompatible with some aspect of the old flash contents. I've verified that the uploaded data has the right values in 000 and FFB through FFE. I could go farther than that, but the experiment seems to work to a 1st approximation. The second possibility is always on the table, God knows, but if it is user error I keep making the same mistake over and over. (Yes, a definition of insanity etc. etc.) The third possibility seems plausible.

Here are the particulars if my setup:

Mac with El Capitan
Y.C. USB to serial with native drivers
"Serial" terminal 4800 baud, 8N1, binary upload
41-CL BAUD48

The transfer finishes on the computer and YIMP subsequently returns. The XROM number and .NAME values agree with the source. I think that piece is solid. I think I'm probably missing a dependency. Can anyone help?


Find all posts by this user
Quote this message in a reply
Post Reply 

Messages In This Thread
41CL Module Dependencies - Howard Owen - 04-26-2016 06:02 PM

User(s) browsing this thread: 1 Guest(s)