Atel Electronics AT8-4

Overview
"CA804.00A" is silkscreened on the board.

Per the manual, the device is running Linux (kernel ver. 2.4.18).

Links of Interest
Product page
 * Manual (PL)
 * Manual (EN)

Serial Pinouts
JP1    [(GND) (TxD) (...) (RxD) (...) (...)]