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wbvreeuwijk · (This post was last modified: 12-02-2020 11:47 AM by wbvreeuwijk.)

Hi All,

I recently installed the wonderful HP-41CL board in one of my HP-41CV's and it has now become my device of choice. I really like the power it brings in the beloved HP-41 form-factor.

While trying out the upgrade of a number of ROMs through the HP-IL ROM update procedure I made an error in trying to upgrade (YFNX and YLIB) while they were loaded. The update process got stuck. This was the output of the update process:

Code:

XROM "FUPDATE"

LOAD: Z

LOAD: INDEX

008>810

YFNX

YLIB

008000

The calculator got stuck at the last line and I had to pull the power to get control back.

After this, I was able to do almost everything that I was able to do before apart from switching to the YFNX ROM. Whenever I tried this the machine just hangs.

This leads me to believe that either YLIB or YFNX are corrupted. I was able to use the same update process to update YFNX and YLIB (while having YFNZ, YUPS, and YUIL loaded), but this doesn't seem to fix it.

I also had a look at using the serial connection to perform an update, but this seems to require YFNX.

Any help to fix this would be highly appreciated. Also, pointers on what is need to re-flash the HP-41CL flash through the JTAG connector on the board would help.

Thanks in advance