IBM - 09F1889 - Interface Board 8-Port RS-232C 09F1889 - IBM - 8-Ports RS-232C Electrical Interface Board for PS/2 Model 55 SX HMS $109.07 $88.68
IBM - 09F1890 - Multiport Adapter 8-Port RS-232C RS-422-A 09F1890 - IBM - 8-Ports RS-232C / RS-422-A Multiport Adapter $80.44 $65.40
IBM - 93H6540 - Controller PCI 8-Port EIA-232E RS-422A 93H6540 - IBM - PCI 8-Port EIA-232E/RS-422A Controller (RS FC 2943) $125.46 $102.00
HP - J2076A - Processor Board 24-Port RS-232C Asynchronous J2076A - HP - 24-Ports RS-232C Asynchronous Processor Board $86.98 $73.71
IBM - 15F8858 - Interface Board 8-Port RS-422 15F8858 - IBM - Atric MultiPort/2 8 Port RS-422 Interface Board $180.73 $146.94