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<TITLE>Int 21/AH=37h
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Int 21/AH=37h - DOS 2.x and 3.3+ only - AVAILDEV - SPECIFY \DEV\ PREFIX USE -
AH = 37h
AL = subfunction
02h get availdev flag
Return: DL = 00h \DEV\ must precede character device names
= nonzero \DEV\ is optional
03h set availdev flag
DL = new state
00h \DEV\ is mandatory
nonzero \DEV\ is optional
Return: AL = status
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<h2>Int 21/AH=37h
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<h3><font color=#C00040>DOS 2.x and 3.3+ only - AVAILDEV - SPECIFY \DEV\ PREFIX USE</font></h3>
<PRE>
AH = 37h
AL = subfunction
02h get availdev flag
<p><b>Return:</b><br>DL = 00h \DEV\ must precede character device names
= nonzero \DEV\ is optional
03h set availdev flag
DL = new state
00h \DEV\ is mandatory
nonzero \DEV\ is optional<br>
<p><b>Return:</b><br>AL = status
00h successful
FFh unsupported subfunction
</PRE>
<p><b>Notes:</b>
All versions of DOS from 2.00 allow \DEV\ to be prepended to device
names without generating an error even if the directory \DEV does
not actually exist (other paths generate an error if they do not
exist); DOS 2.x has an AVAILDEV= option in CONFIG.SYS to make \DEV
mandatory.
Although MS-DOS 3.3+, DR DOS 3.41+, and Novell DOS 7 accept these
calls, they have no effect, and AL=02h always returns DL=FFh (except
for Novell DOS 7, which leaves AX unchanged for both subfunctions)
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<b>Category: <a href="cat-010.htm" tppabs="http://www.ctyme.com/intr/cat-010.htm">
DOS Kernel</a>
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Int 21h</a>
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