Where might a fellow dig up an already-dumped ROM image (not EPROM, ROM) from a 1227747?

I'd like to, for my own curiosity, disassemble the ROM + EPROM code to get a better sense of how the code works.

I know that the ROM can be dumped, and I can do that, but why reinvent the wheel if someone already has a binary image of the ROM handy.

thanks!
Michael