I've been just reading Fuji's writeup from a few years back on adjusting the startup text on an Apple IIe by changing some of the ROM's code. I wondered if a similar operation could be performed on a IIc, and if anyone might have some experience with that or any other modifications to a //c ROM.
Obviously the code on the IIc is quite different from that of other Apple IIs. What I've found looking at the ROM 0 code that I've dumped is that there isn't any string that matches what the default title text says. Indeed, not even "app" or "//" can be found. So, I assume it's been obscured in some way on the IIc that it wasn't on the earlier models.
Background is that my son is super into filmmaking and our collection gets some use in his film projects. Similar to how we saw a TRS-80 in Andor, we like to use real vintage computers as in-universe props. Such a mod would allow us to create a neat effect for filming.
Anyhow, since this appears to go beyond simply modifying the ASCII text on the ROM in this case, I'm afraid I'm out of my depth. Any help would be super appreciated!