need serial port for optiplex 390 sff

The Serial PS2 Port Adapter from Dell™ adds PS2 functionality to your system. This product has been tested and validated on Dell systems. It is supported by Dell Technical Support when used with a Dell system.Dell Y9001 - OptiPlex Serial P/S2 Add-In Card Assembly

Dell Serial P/S2 Add-In Card and Cable Assembly for Select OptiPlex Systems, Low Profile, SFF, Desktop, MT, Add-In Card, Dell Y9001, N3563. 

Part Number(s): Y9001/ 0Y9001 Serial/ PS2 ADD-IN Card, LOW Profile For Dell ComputersCategory: Internal Parts and assembliesSub Category: Boards (Control)Notes: D9906 PWA, I/ O, SER/ PS2, DT, LPF, ULD, N3563 CBL, CRD-SER, PS2, DC431 Tape, ADH, DBL, .045IN THK, VHB, HH, MC355 Brkt, MTG, MET, HH, 2.0, 01157 Stdf, HEX W/ Wshr, 4-40X.250, STLPart Number Y9001/ 0Y9001 compatible with the following Dell Models:


OptiPlex 320, OptiPlex 320 Desktop, OptiPlex 320 Mini-Tower, OptiPlex 330, OptiPlex 330 Desktop, OptiPlex 330 Mini-Tower, OptiPlex 360, Optiplex 390, OptiPlex 740, OptiPlex 740 Desktop, OptiPlex 740 Mini-Tower, OptiPlex 740e, OptiPlex 745, OptiPlex 745 Desktop, OptiPlex 745e, OptiPlex 755, OptiPlex GX520, OptiPlex GX620