In Search of 15C+ ROM image

[Didier Lachieze]

(07-15-2022 03:20 PM)dmh Wrote:  I can't match the LE release image with the pre-patch values.

Consider this as a little challenge very rewarding when you solve it and get the patched HP-15C LE to display the upgraded [g] [MEM] configuration.

J-F wisely provided only the patch values and addresses (by far the most difficult part of the upgrade) and let the implementation in the LE firmware to us.

(07-15-2022 03:20 PM)dmh Wrote:  What hex editor are you using and is the NUT address offset in the firmware?

I’m using HxD but any hex editor should do it. In the editor you should be able to find the beginning of the original 15C ROM code.

(07-15-2022 03:20 PM)dmh Wrote:  I assume you need to do 10 bit values? I can't find an existing utility to do this.

Hint n°1: two bytes make a Nut.

(07-15-2022 03:20 PM)dmh Wrote:  I might be missing something :-)

Hint n°2: Gulliver’s Travels