> I would look at having the bus as a CAN bus. OK it would limit you
> to 18 series chips, or using the MCP CAN controller series with a 16
> series chip

Planned on using the 16F88. The smallest with CAN looks to be a 28-pin
(18F248/258) and doesn't have the comparators I need

Good idea, and I'll look into the controller, but it might be CAN's
turn another day

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