yep, you did it right. but it seems something went wrong, perhaps not correct serial comms settings like parity or stop bits count ?
I'd imagine these things might be configured by CRW DIP switches, so even if InitialD games uses exact same device, in theory they may use not the same UART settings as DOC games.
I tried to roll with the
8 data bits
1 stop bit
Still got the same kind of log as before...