The Oasis-4i PCI-compliant plug-in board from Prior Scientific Inc. controls stepper-motor-driven X-Y stages, Z-axis focus mechanisms and four-axis devices such as filter wheels and theta rotating drives. It provides repeatable open-loop operation and is available with either a 32-bit DLL or an ActiveX developer kit. The controller integrates into Visual Basic, Visual C++ or Delphi applications. The developer kit allows programmers to create rectangular, circular, cross, random or user-defined scanning patterns. The device offers independent and simultaneous control, read/write flash memory and joystick or mouse control options with dual serial ports.