Vbio.dll (16bit & 32bit) is intended to read and write PC I/O ports in Windows 3.x/95/98 application. In old Quick Basic, there are two functions INP and OUT which enable users to access I/O ports. But they are missing in Visual Basic. There are lots of people in newsgroup requesting similar feature, so I decide to release Vbio.dll as the replacement of INP and OUT. It also supports get LPT address and BIOS information. This DLL is very useful especially when you develop a hardware device and want to interface it in your Windows application. 16-bit and 32-bit Visual Basic samples are included. You can also use it in other languages, such as FoxPro/Visual FoxPro, Delphi, and so on. The source code is written in Visual C++ v1.52(16-bit) and v5.0(32-bit)