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Is this getting close ?

In this circuit, with Ctrl=0 the PIC can listen to PC1, as the
pull-up will enable traffic through the top two gates. If Ctrl=1
then that will disable traffic from PC1 and enable it for PC2

You could use individual enable controls for each PC (if you
expand to more than 2 PCs) if you can assure that all will not
be turned on together and so give data collisions/mixing

My assumption was that you were saving costs by multiplexing
the more expensive MAX chip, hence my query about voltage
levels

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