Date: Wed, 08 Dec 1993 14:27:52 +0100
From: HJ AT vpymza DOT sowi DOT Uni-Mainz DOT DE
Subject: Accessing untranslated physical addresses above 1 MB
To: djgpp AT sun DOT soe DOT clarkson DOT edu

From:	VPYMZA::HJ            3-DEC-1993 11:35:31.48
To:	VZDMZA::IN%"djgpp AT sun DOT soe DOT clarkson DOT edu"
CC:	HJ
Subj:	Accessing real memory above 1 MB

Hallo list,

we have a localbus card with a local memory buffer of 8 MB. This is
mapped somewhere into the extended address range of the 386. Now 
we want to access this buffer from a GO32 program. 
This should work out like e.g. the graphics memory, which is mapped 
to some adress. No paging is neccessary, cause we have a linear address
range.

If I remember well, this problem has been discussed some time ago for
SVGA cards which can map their memory above 1 MB.

Has someone done this before, or can someone give us pointers (DJ ???)
what to change in the extender ?

All help appreciated, I~ll summarize to the list .
Please reply by e-mail.


Hans-Juergen Bergmann