I am looking for a single-board-computer with the following requirements.
- performance is not too important
- must support modern Linux (Debian)
- 2 (better 3) RS-232 interfaces
- availability of a compact case with RS-232 9-pin holes
I would find many embedded PCs from industrial hardware manufactors with casing but the lifetime of that is only a few years. Afterwards they only have new boards and new cases.
I would love to use a RasperryPI. It is longtime available and cheap. But the problem is the RS-232 in conjunction with the case.