I just bought a couple of Advantech AIMB-214E mini-ITX 1.86 GHz motherboards
from a local surplus store for $25 ea (NIB). They have 6 genuine RS-232 ports
(two can be configured for RS-422/485). Alas, the store don't do mail order
and are currently out of stock (but the boards are around $50 on Ebay). And
suitable cases/power supples look like at least $50. They can be run off of
12V@2A from an on-board barrel connector.
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