ZyXEL "U-336" MODEM firmware v1.18:

 model name  description  filename
release notes of all releases incl. v1.18 336s_118.txt
Drivers Windows 9x FTP-Directory
U-336E Manual external modem, with LEDs 336e_118.zip
U-336S Manual external modem, with LCD 336s_118.zip
U-336R Manual modem card for RS-1612 rack + NMS 336r_118.zip
U-336RE modem card for RS-1612 rack 336re118.zip