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<TITLE>Int 21/AX=253Dh
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Int 21/AX=253Dh - Phar Lap 386/DOS-Extender v4.0+ - READ/WRITE IDT DESCRIPTOR -
AX = 253Dh
BL = interrupt number
ECX = direction (0 = read, 1 = write)
DS:EDX - 8-byte buffer for descriptor
Return: CF clear if successful
DS:EDX filled if reading
CF set on error
EAX = error code (0082h if running under DPMI)
Desc: access hardware-level IDT rather than the internal 386/DOS-Extender
shadow IDT
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<h2>Int 21/AX=253Dh
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<h3><font color=#C00040>Phar Lap 386/DOS-Extender v4.0+ - READ/WRITE IDT DESCRIPTOR</font></h3>
<PRE>
AX = 253Dh
BL = interrupt number
ECX = direction (0 = read, 1 = write)
DS:EDX -> 8-byte buffer for descriptor<br>
<p><b>Return:</b><br>CF clear if successful
DS:EDX filled if reading
CF set on error
EAX = error code (0082h if running under DPMI)
</PRE>
<p><b>Desc:</b>
Access hardware-level IDT rather than the internal 386/DOS-Extender
shadow IDT
<p><b>Notes:</b>
This call will always fail under DPMI because it is not possible to
access the IDT.
The descriptor is not checked when writing.
This call can normally be used only by programs running in ring 0
because the processor does not allow an interrupt to be vectored to
a less privileged ring
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