Re: FCBs

Article View: comp.lang.asm.x86

Article #102

#102

From: device
Date: Tue, 16 Mar 1999 00:00

25 lines
1904 bytes

This information was taken from ASMEDIT help files.

AH    = 13h
DS:DX = pointer to an unopened FCB

Returns:

AL    = 00h if file deleted
      = FFh if file not found

Here is the format of a non extended FCB for MS-DOS 1.0:

offset       size      purpose
----------------------------------------------------------------------
00           byte      drive number(0 = default, 1 = A, 2 = B, ...
01           8 bytes   filename, left justified padded with spaces
09           3 bytes   filename extension, padded with spaces
0C           word      current block number relative to start of file
0E           word      logical record size in bytes
10           dword     file size in bytes
14           word      date created or last updated(standard format)
16           word      time of last write(standard format)
20           byte      current relative record number

Dave

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From: device <dpsiciliaNO_SPAM@mindspring.com>
Subject: Re: FCBs
Date: 1999/03/16
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