Panasonic HHC ROM 'capules'

[brouhaha]

(01-17-2023 01:16 PM)Jeff_Birt Wrote:  At this point I'm not sure how it finds out there is a ROM in the socket.

It determines that by reading it. If there's nothing there, or if you're not actually doing something that needs the ROM (which could include using it to control an I/O device, even while another capsule has overall control), then it never accesses it again, so you wouldn't ever see the power getting switched on.

I haven't yet identified the specific code involved. It's probably SNAP code, and I haven't decoded all of that. It might be part of power-up, or it might be done by LOC.PRG, which is called by the menu selector.

I need to write a SNAP decompiler. In the past, I've just decoded SNAP words by hand, and that's a pain, especially with control structures that use relative addresses.