Motorola WA840G v1

User guide

presumably OEM Gemtek, probably model WAPB-102G

This device has the same hardware as the Motorola WE800G v1.

On the DD-WRT forums
 * Motorola we800g JTAG pinout - DD-WRT forums

WE800G on the OpenWrt wiki
 * some units may have 2MB Flash and 8MB RAM

The default SSID is probably motorola XXX where XXX is the last three hex digits of the wireless interface MAC (capital letters).