Besides my single-board IN17-based 7 digit, I did a HH:MM:SS:T display board with 8422s and one IN17 for tenths; This board is compatible with the same board I am working on.
I also have a B7971x4 board and an IN18x4 board; 2 can be chained for 8 B7971s.
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Cheers,
..c
