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From: blk5743 AT yahoo DOT com DOT tw
Newsgroups: comp.os.msdos.djgpp
Subject: Re: code from BC31(16bits) to DJGPP(32 bits)
Date: 30 Nov 2005 17:34:54 -0800
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Precedence: bulk

XMS should be above 1MB, right.
but DX:BX max is FFFF:FFFF can not over 1MB
therefore, the max allocated XMS buffer's start address = 1M+64K
if i allocate 2 region of 1MB block, how can i get the 2 region's start
address.

another question is about physical address of buf i declar
**************************************************************************************
-----r_buffer?-------   physical __djgpp_conventional_base+&r_buffer,
no RM
address, PM address &r_buffer
|              |               |
|              |               |
--------EXE--------   physical __djgpp_conventional_base, no RM
address, PM
***************************************************************************************
i have a test code as below
BYTE r_buffer[100],buf[20];
==>r_buffer's physical address
==> DWORD Addr = (DWORD)__djgpp_conventional_base+(DWORD)r_buffer
where )__djgpp_conventional_base = 0xEF810000, r_buffer = 0x126E8

dosmemget(Addr,10,buf);==> it will fail(seem Addr is too large, the max
i tried is 0x105FF7)
program exit code:255(0x00FF)

how can i make sure that physical address is correct.
i need to check the physical address is correct like this
==>PRD_DDS.Offset =(ULONG)PRD_Table+__djgpp_conventional_base; 


thanks