Comment Axiom Data Acquisition Boards (Score 5, Informative) 11
Back in the day, I used to work w/ Axiom D/A & A/D boards. They have PC104, PCI, & ISA cards. We had our best results with Axiom products. They would go through hell and back, were quite forgiving of bad wiring (after 48 hours straight, wire colors can start to merge together), were alot cheaper then other solutions of the time, and we had quite good luck getting support from them.
A quick glance through their site www.axiomtek.com, I came across a 16 channel board that supports "Red Hat Linux kernel version 2.2.X - AX509SP.
Might want to give these guys a look...