From: Gautier <Gautier.deMontmollin@maths.unine.ch>
Subject: Re: VIDEO MEMORY ACCESS WITH POINTERS
Date: 1999/11/30
Date: 1999-11-30T00:00:00+00:00 [thread overview]
Message-ID: <3843A999.FC8C4ABE@maths.unine.ch> (raw)
In-Reply-To: 81p3sh$h2m$1@news.colba.net
> Simple problem: I want to able to read and write directly into the video
> memory using Ada code. Ex: writting the 16bits value 0x4141 at the address
> 0xb8000000.
> I'm a new user of ADA, in Pascal or C, it's very simple. But with the strong
> protection of Ada, I'm lost. I know the basics of pointers in ADA (called
> access), but I don't know how to directly address the value 0xb800000 to a
> pointer. I've tried to assign the address using Unchecked_Conversion and it
> works. But when I try to read or write the content in memory, a
> constraint_error exception is raisen.
Take a look at SVGA02X4.ZIP
http://members.xoom.com/gdemont/logiciel/svga02x4.zip
page
http://members.xoom.com/gdemont/gsoft.htm
HTH
Gautier
prev parent reply other threads:[~1999-11-30 0:00 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
1999-11-27 0:00 VIDEO MEMORY ACCESS WITH POINTERS ???
1999-11-27 0:00 ` David C. Hoos, Sr.
1999-11-27 0:00 ` DuckE
1999-11-29 0:00 ` Nick Roberts
1999-11-29 0:00 ` Niklas Holsti
1999-12-01 0:00 ` Robert Dewar
1999-11-28 0:00 ` Vladimir Olensky
1999-11-30 0:00 ` Gautier [this message]
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