Note: This API call is for DOS personality only. Use Family API for portability.
Int 21H, AH=52H
2 and higher
“SYSVARS” - GET LIST OF LISTS
AH = 52h
ES:BX -> DOS list of lists (see #01627)
partially supported by OS/2 v1.1 compatibility box (however, most pointers are FFFFh:FFFFh, LASTDRIVE is FFh, and the NUL header "next" pointer is FFFFh:FFFFh). partially supported by the Windows NT DOS box; contains only a rudimentary Current Directory Structure (see #01645) on return, ES points at the DOS data segment (see also INT 2F/AX=1203h) Quarterdeck's suggested check for the use of its DOSDATA.SYS or DOS-UP.SYS is to test whether the list-of-lists segment is greater than the segment of the first memory block; a better check for DOS-UP.SYS is INT 21/AX=2B01h/CX=444Dh because not all DOS workalikes support all fields in the List of Lists, applications should ensure that pointers are neither 0000h:0000h nor FFFFh:FFFFh before using them Windows for Workgroups 3.11 network and Windows95 set the path to the local drive and directory even for network drives; in that case the UNC form \\SERVER\SHARE can be obtained with INT 21/AX=5F02h or INT 21/AX=5F46h. LapLink RemoteAccess does the same even for INT 21/AX=5F02h Windows95 GUI no longer returns the true path for a SUBSTed drive, but MS-DOS 7.00 does; use INT 21/AH=60h to obtain the true name
Text based on Ralf Brown Interrupt List Release 61