*edit* Does someone have Checker Challenger CR?
The manual says that the "to" digits will blink if the CPU opponent wants to make a double or triple jump, indicating that the user needs to press the "TO" button to see the next jump.
It does not blink on the emulator. Is the manual wrong maybe?

Sean (the person that dumped the rom) can't test it.
Reason: chip is decapped

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Franz: ucom4 worked well already on 0.220 so no problem there.

Try doing a full compile
Or, if you have something like cbemu.lua in the scripts folder, add UCOM4 CPU to it.