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From:	"philippe meynard" <philippe DOT meynard AT vendeeconcept DOT com>
Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: Accessing absolute address above 1MB
Date:	Wed, 8 Nov 2006 10:02:52 +0100
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References:	<1162915098 DOT 476438 DOT 52420 AT k70g2000cwa DOT googlegroups DOT com> <4550adea DOT sandmann AT clio DOT rice DOT edu> <1162922909 DOT 133028 DOT 98340 AT f16g2000cwb DOT googlegroups DOT com>
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To map a physical device to linear memory
you must do :

_dpmi_meminfo info;

ADDR=your physical adresse of device here 0x3FF00000;
info.address=ADDR;
info.size=size access of device (exemple frame buffer video 8 Mb)
if(__dpmi_physical_adress_mapping(&info)==-1){
    printf("Physical mapping of address 0x%x failed!\n",(unsigned int)ADDR);

}

 ADDR1=ADDR+ __djgpp_conventionnal_base; //is the virtual adress to access 
device
exemple:
*ADDR1=15; //a white pixel on screen



"James" <countingtoten AT gmail DOT com> a écrit dans le message de news: 
1162922909 DOT 133028 DOT 98340 AT f16g2000cwb DOT googlegroups DOT com...
>I tried that and still receive the same error message.
>
> Charles Sandmann wrote:
>> > I am trying to access the memory address 0x3FFF0000 in DOS using dpmi.
>> ..
>> >  buffer[0] = _farpeekb(selector, mi.address);
>>
>> mi.address should be 0 here, since the offset is built into the selector
>> you just set up
> 

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