Glad to hear the issues are resolved. Enjoy the game!
Viewing post in Dreadline for Intellivision (digital version) comments
The latest 1.2 should be enough to work.
The main issue is that the emulator inside the Sprint was not reading the JSON properly, in particular the line that says "jzintv_extra".
That is vital for enabling expanded GRAM for Dreadline, otherwise graphics will be messed up.
Mechatron does not incur the same issue, but certainly having the latest firmware can't hurt.