Problem with Nintendulator

[Big_Woop]

Hello

I have downloaded Nintendulator (version 0900) and got some games working with it. But when I try to run castlevania 2 and 3, I just get this message: "Bad opcode, CPU locked". Anyone know what the problem might be?

[retroguiden]

Regarding the Opcode there's this 'standard' answer:
"An "opcode" error most often means the emu is running wild (due to whatever error), and tries to interprete some random memory as code.

The reason for this can be everything."

The first thing you should do is try the latest/last version of the emulator. In version 0.950 there has been some Opcode implemented. Don't know if that solves your problem, but it is often best to use the latest version of a program.

There could also be something rom with the roms you have.