HP-15C expanded memory firmware: problems with matrix larger than 8x8

[Giorgio]

I found those non-zero values in the HP-15C Limited Edition ROM, and I just checked that the same values are also in the HP-15C Collector Edition ROM.

It is not obvious to me how I could test your patch using the original 15C ROM. But since you confirmed that it is OK to overwrite non-zero data at these addresses, I have flawlessly patched my 15C CE and the PC emulator of the 15C LE that I am using regularly.

If acceptable, it would certainly be useful if HP/Moravia could embody this patch in a future upgrade of the 15C CE firmware.