Virtual TI, or "VTI," is a feature-rich graphing calculator emulator for Microsoft Windows, written in C++ by Rusty Wagner. It features a graphical debugger, a grayscale display, data transfer between computer and emulated calculator, black-link, parallel link and more.There are currently two versions available: Virtual TI v.2.5 (beta) Virtual TI v.3.0 (alpha)Version 2.5 supports the TI-82, 83, 83+, 85, 86, 89, 92, and 92+.