| Description | Model Code |
|---|---|
| Mouse Port (PS/2) | B-5XXMP |
| Mouse Port (PS/2) for HP 700 Series | (replaced by B-5XXMP) |
| Universal Serial Bus (USB) | B-5XUSB |
| Sun | B-SUNMD |
| Serial (RS-232) | B-5XX9P |
| DEC & VAX Station (excluding mouse port models) | B-5XDEC |
| Silicon Graphics (Indigo/Onyx/Crimson, excluding mouse port models) | B-SGXMD |
| Hewlett Packard Quadrature | B-5HPQP |