HP 40290-60007 - Loopback connector - For 50-pin RS-232C connector - For testing all ports on the RS-232C ATP 37/M PC board Retail
HP 40290-60003 - RS-232C connector panel (Option 125) - With eight 25-pin ports (Four modem connect ports, and four direct connect ports) Retail
HP 40290-60006 - RS-232C connector panel (Standard) - With seven direct connect 3-pin ports and one modem connect 25-pin port Retail
HP 27140-69001 - CIO 6-CHANNEL RS-232C MUX I/O board - CIO 6-Channel RS-232C MUX I/O Board (P/O 27140A) Retail
