INT 15 U - Toshiba laptops - VCHAD.EXE - INSTALLATION CHECK AX = CCCCh Return: AX = ABCDh if installed Note: supported by Toshiba VGAVideo Graphics Array(Video Graphics Array) The video adapter introduced with the IBMInternational Busiuness Machines PS/2IBM PS/2, any model series of computers. change display utility VCHAD.EXE ver 2.90+ older versions have the string "VCHAD" 2 bytes after the address of the INT 15 handler which is hooked by all versions for the SysReq key SeeAlso: AH=85h