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<TITLE>Int 15/AH=87h
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Int 15/AH=87h - SYSTEM - COPY EXTENDED MEMORY -
AH = 87h
CX = number of words to copy (max 8000h)
ES:SI - global descriptor table (see #00499)
Return: CF set on error
CF clear if successful
AH = status (see #00498)
Notes: copy is done in protected mode with interrupts disabled by the default
BIOS handler; many 386 memory managers perform the copy with
interrupts enabled
on the PS/2 30-286 & Tortuga this function does not use the port 92h
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<h2>Int 15/AH=87h
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<h3><font color=#C00040>SYSTEM - COPY EXTENDED MEMORY</font></h3>
<PRE>
AH = 87h
CX = number of words to copy (max 8000h)
ES:SI -> global descriptor table <a href="rb-1527.htm#Table499" tppabs="http://www.ctyme.com/intr/rb-1527.htm#Table499">(see #00499)</a><br>
<p><b>Return:</b><br>CF set on error
CF clear if successful
AH = status <a href="rb-1527.htm#Table498" tppabs="http://www.ctyme.com/intr/rb-1527.htm#Table498">(see #00498)</a>
</PRE>
<p><b>Notes:</b>
Copy is done in protected mode with interrupts disabled by the default
BIOS handler; many 386 memory managers perform the copy with
interrupts enabled.
On the PS/2 30-286 & "Tortuga" this function does not use the port 92h
for A20 control, but instead uses the keyboard controller (8042).
Reportedly this may cause the system to crash when access to the
8042 is disabled in password server mode (see also PORT 0064h,#P0398).
This function is incompatible with the OS/2 compatibility box
<p><b>See Also:</b>
<a href="rb-1529.htm" tppabs="http://www.ctyme.com/intr/rb-1529.htm">AH=88h</a> - <a href="rb-1531.htm" tppabs="http://www.ctyme.com/intr/rb-1531.htm">AH=89h</a> - <a href="rb-2452.htm" tppabs="http://www.ctyme.com/intr/rb-2452.htm">INT 1F/AH=90h</a>
<PRE>
<p>
<a name=table498></a>
(Table 00498)
Values for extended-memory copy status:
00h source copied into destination
01h parity error
02h interrupt error
03h address line 20 gating failed
80h invalid command (PC,PCjr)
86h unsupported function (XT,PS30)
<p>
Format of global descriptor table:
<a name=table499></a>
Offset Size Description (Table 00499)
00h 16 BYTEs zeros (used by BIOS)
10h WORD source segment length in bytes (2*CX-1 or greater)
12h 3 BYTEs 24-bit linear source address, low byte first
15h BYTE source segment access rights (93h)
16h WORD (286) zero
(386+) extended access rights and high byte of source address
18h WORD destination segment length in bytes (2*CX-1 or greater)
1Ah 3 BYTEs 24-bit linear destination address, low byte first
1Dh BYTE destination segment access rights (93h)
1Eh WORD (286) zero
(386+) extended access rights and high byte of destin. address
20h 16 BYTEs zeros (used by BIOS to build CS and SS descriptors)
</PRE>
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