Category: other operating systems
INT 2F - PTS-DOS 6.51, S/DOS 1.0+ - GET FIRST UMB AX = 1261h Return: AX = address of first UMB or 1 if invalid function. Note: This function is known to be supported by Paragon Technology Systems PTS-DOS 6.51 and S/DOS 1.0, and probably was also supported in earlier releases.