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From: | "Tony O'Bryan" <aho450s AT nic DOT smsu DOT edu> |
Newsgroups: | comp.os.msdos.djgpp |
Subject: | Re: What is the Transfer Buffer? |
Date: | Fri, 15 May 1998 21:30:44 +0000 |
Organization: | Southwest Missouri State Universtiy |
Lines: | 17 |
Message-ID: | <355CB404.756E5F67@nic.smsu.edu> |
References: | <01bd7bac$d3952440$LocalHost AT default> |
NNTP-Posting-Host: | sara.a49.smsu.edu |
Mime-Version: | 1.0 |
To: | djgpp AT delorie DOT com |
DJ-Gateway: | from newsgroup comp.os.msdos.djgpp |
Dark Angel wrote: > Can someone please explain me what is the transfer buffer? > Is it used to transfer memory from real mode to protected mode? > > thank's, Jorge Lima from Dark Angel Soft, Portugal The only way to pass pointers to the Real mode BIOS/DOS interrupts is to pass it an address in low memory (since that is the only place guaranteed to have the physical and logical addresses mean the exact same thing). The transfer buffer is an intermediary between DJGPP and the real mode interrupt calls. It's a convenience for passing addresses to DOS calls. I believe this is covered in Eli's excellent FAQ.
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