Note: This API call is for DOS and Win16 personality only. Use Family API for portability.
AH=01H
Version
2 and higher
Brief
Request High Memory Area
Family API
none
Input
AH = 01h DX = Space needed in the HMA by the caller in bytes (if the caller is a TSR or device driver), DX = FFFFh (if the caller is an application program)
Return
AX = 0001h if the HMA is assigned to the caller, 0000h otherwise BL = Error code