HP 5061-4941 - Serial I/O board - Does NOT include firmware - Serial I/O Board - Does NOT Include Firmware (Same Board Used for 12007A/07B/42B/43B/73A/75A and 92A) Retail
HP J2093-69011 - HP-PB 16 channel RS-422/423 direct connect MUX board - HP-PB 16 Chnl RS-422/423 Direct Connect MUX Bd (P/O J2093A) Retail