HP 12040-69005 - 8-channel asynchronous (RS-232C) MUX I/O board - 8-Channel Asynchronous (RS-232C) MUX I/O Board (12040A/B) Retail
HP 12040-69014 - 8-channel asynchronous (RS-232C) MUX I/O board - 8-Channel Asynchronous (RS-232C) MUX I/O Board (12040C/D) Retail
HP 40299-69021 - HP-PB 8 channel RS-232C MUX interface - HP-PB 8 Channel RS-232C MUX Interface (P/O 40299B) Retail