Q34472: MASM 5.10 MACRO.DOC: Drive Control

Article: Q34472
Product(s): See article
Version(s): 5.10   | 5.10
Operating System(s): MS-DOS | OS/2
Keyword(s): ENDUSER | | mspl13_masm
Last Modified: 12-JAN-1989

The following information was taken from the MASM 5.10 MACRO.DOC file.

DRIVE CONTROL

@GetDrv (0Eh) and @SetDrv (19h)

Gets or sets the current drive

Syntax:         @GetDrv
                @SetDrv drive

Argument:       drive       = 8-bit drive number (0=A, 1=B,
etc.)
Return:         @GetDrv     = Drive number in AL (0=A, 1=B,
etc.)
                @SetDrv     = Number of drives in AL
Registers used: AX for both; DL for @SetDrv

@ChkDrv (36h)

Gets various data about a disk

Syntax:         @ChkDrv [drive]

Argument:       drive       = 8-bit drive number (0=current,A=1,
                              B=2, etc.); if none given, current
                              assumed
Return:         AX          = Sectors per cluster (-1 if drive
                              invalid)
                BX          = Available clusters
                CX          = Bytes per sector
                DX          = Clusters per drive
Registers used: AX, BX, CX, and DX

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