Terry, 64 slt sets on a dual cabinet but that's if both cabinets are full blown.
2 of the 170 cards in each cabinet.
If they are both base cabinets then only 16 apiece
It sounds like you have a version 1 and a pre version 1.
They are supposed to be the same version but you might get it work if you use the -1 (P101A) as the master and the other as the slave.
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MrG