The is a classic multimode controller (TNC) from Timewave (originally AEA). "Official" firmware updates from Timewave have been rare for many years, but here is the current status and where to find software/firmware:
Mira watched one such morning, coffee cooling in her hand, as a node on the telemetry map lit up with a notification: “PK232MBX software updated — integrity verified.” It was an official-sounding line, but to her it read like a short story: the old and the new meeting at a fragile seam, patched together by curiosity and care. pk232mbx software updated
Carefully remove the old chips. Install the new Low chip in the lower numbered socket and the High chip in the higher numbered socket. The is a classic multimode controller (TNC) from