[HP35S] Disassembling ROM

[Tim Wessman]

(02-22-2015 07:21 PM)Tugdual Wrote:  Using IDA you rapidly accumulate a lot legit 6502 fragments and it doesn't even look like it was compiled from C which I found surprising.

Hmm... maybe you start to understand the problem/difficulty in fixing things... :-)

Completely non-documented (at least in anything but sparse chinese) source, non-English tools, extensive regions of assembly using non-standard assembly heavily dependent on non-documented features and registers requiring a close working relationship with the exact chip manufacturer (who doesn't have anyone who understands the chip anymore), no way to flash or change the firmware once flashed, etc

If you can imagine it, chances are it is part of the issue.