Int 2F/AX=E000h

AX = E000h

Return:
AX = 4A52h ("JR") if present

Program: SETDRVER is a public domain TSR by Jacob Rieper which sets the apparent DOS version analogously to MS-DOS SETVER

Notes: This installation check differs from the usual one of returning AL=FFh. The SETDRVER API is fully emulated by Matthias Paul's FREEVER

See Also: AX=E000h/DX=4D50h - AX=E001h - INT 21/AH=52h