I am trying to change the language in a Lost World Jurassic Park (Sega/Stern Whitestar) and understand that the ROMs need to be changed. I have downloaded the ROM package from IPDB and when unzipped have the files:
I believe that I only have to update the CPU and Display ROMS (?) and have removed the CPU (U210) and Display (U12) ROMs, which are 27C040 chips.
I burned and verified the JP2CPU.202 and JP2DSPA.201 files onto 27C4001 chips as ROM files, not BIN. My understanding is that 27C040 and 27C4001 chips are interchangeable and the same ones worked in my Demolition Man. I installed the two chips back in the boards in the correct orientation but now all the pin does is blink the GI on/off. No sounds, display, or anything.
Edit: I set the DIP switches for USA before installing the updated CPU & DSP ROMS.
Do I also need to update the ROMs for u7, u17, and u21?