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oldlinux-files/docs/interrupts/int-html/rb-2684.htm
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<TITLE>Int 21/AH=28h
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Int 21/AH=28h - DOS 1+ - RANDOM BLOCK WRITE TO FCB FILE -
AH = 28h
CX = number of records to write
DS:DX - opened FCB (see #01345)
Disk Transfer Area contains records to be written
Return: AL = status
00h successful
01h disk full or file read-only
02h segment wrap in DTA
CX = number of records written
Notes: write begins at current file position as specified in FCB; the file
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<h2>Int 21/AH=28h
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<h3><font color=#C00040>DOS 1+ - RANDOM BLOCK WRITE TO FCB FILE</font></h3>
<PRE>
AH = 28h
CX = number of records to write
DS:DX -> opened FCB <a href="rb-2574.htm#Table1345" tppabs="http://www.ctyme.com/intr/rb-2574.htm#Table1345">(see #01345)</a>
Disk Transfer Area contains records to be written<br>
<p><b>Return:</b><br>AL = status
00h successful
01h disk full or file read-only
02h segment wrap in DTA
CX = number of records written
</PRE>
<p><b>Notes:</b>
Write begins at current file position as specified in FCB; the file
position is updated after writing.
If CX = 0000h on entry, no data is written; instead the file size is
adjusted to be the same as the file position specified by the random
record and record size fields of the FCB.
If the data to be written is less than a disk sector, it is copied into
a DOS disk buffer, to be written out to disk at a later time.
Not supported by MS Windows 3.0 DOSX.EXE DOS extender
<p><b>See Also:</b>
<a href="rb-2599.htm" tppabs="http://www.ctyme.com/intr/rb-2599.htm">AH=22h</a> - <a href="rb-2683.htm" tppabs="http://www.ctyme.com/intr/rb-2683.htm">AH=27h</a> - <a href="rb-2791.htm" tppabs="http://www.ctyme.com/intr/rb-2791.htm">AH=40h</a> - <a href="rb-3012.htm" tppabs="http://www.ctyme.com/intr/rb-3012.htm">AH=59h/BX=0000h</a>
<p>
<b>Category: <a href="cat-010.htm" tppabs="http://www.ctyme.com/intr/cat-010.htm">
DOS Kernel</a>
- <a href="int-21.htm" tppabs="http://www.ctyme.com/intr/int-21.htm">
Int 21h</a>
- <a href="alpha-d.htm" tppabs="http://www.ctyme.com/intr/alpha-d.htm">
D</a>
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