Int 2F/AX=5600h

INTERLNK - INSTALLATION CHECK

AX = 5600h
DX = magic value FFFFh
BL = instance number (00h = any, 01h = first loaded, etc.)
(BH = 00h and CX = 0000h, see note)

Return:
AL = FFh if installed
BL = instance number
CX = version number (CL = major, CH = minor)
DX = resident CS of driver, DX:0000h -> header (see #02845)

Notes: INTERLNK was derived from Sewell Development Corporation's FASTLYNX.. Some Microsoft software explicitly clears the BH and CX registers before calling this function.

BUG: Reportedly, the MS-DOS INTERSRV program (though not INTERLNK) causes serious FAT corruption and data loss when run under Novell DOS 7. INTERSRV apparently checks for DR-DOS by testing the "OS" environment variable for the value "DRDOS", which is no longer correct for PalmDOS, Novell DOS, or OpenDOS. A workaround may be to explicitly set the OS variable to "DRDOS".

See Also: AX=5601h - AX=5602h - INT 60/AX=0000h

Format of Interlnk device driver header: Offset Size Description (Table 02845) 00h DWORD pointer to next driver, offset=FFFFh if last driver 04h WORD device attributes (see #01647,#01648) 06h WORD device strategy entry point 08h WORD device interrupt entry point 0Ah 8 BYTEs character device name "NUL2 " 12h 165 BYTEs ??? B7h 67 BYTEs fully qualified Interlnk filename FAh 6 BYTEs ??? 100h DWORD pointer back to Interlnk filename at offset B7h 104h 8 BYTEs ??? 10Ch BYTE total number of redirected drives 10Dh BYTE first local drive number (0=A:) 10Eh BYTE printer redirection (0=no, 1=yes) 10Fh BYTE ??? 110h 3 BYTEs LPT1...3 status (0FFh=invalid) 113h 26 BYTEs remote drive number (0=A:, 0FEh=unused) (refer to note below) 12Dh 26 BYTEs always 0FEh ??? 147h 26 BYTEs always 0FFh ???

Note: To obtain the remote drive number, subtract the value at offset 10Ch from the local drive number before indexing into the table at 113h

(example:
If local drives F, G, H are remote drives C, F, E then the first three bytes at offset 113h are 02h, 05h, 04h). For each instance of Interlnk, an extra device driver is loaded, but all have the same device name NUL2

See Also: #01646 at INT 21/AH=52h

Category: Remote Control/File Access - Int 2Fh - I

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