From software point of view, the EAS conversion of Elite Privat / Private Line is identical to the original chesscomputer, hence I never added it to MAME. Today I added an extra view option for it.

Yes it is possible to show a decimal value in the artwork. The undo counter in chess computer drivers is like that. Or see for example the lchicken driver. Your 2nd question: Yes it's also possible I think, but more cumbersome than the other method.

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Does someone have a CXG Sphinx Junior? I'd like to hear the beeper pitch and I couldn't find a video on Youtube.