From: "Mark Oliver" <markoliv AT mercury DOT kosone DOT com>
Subject: can you answer this
Newsgroups: comp.os.msdos.djgpp
Message-ID: <01bc7b5b$6836e640$b328bace@client.kosone.com>
Date: 17 Jun 97 20:13:13 GMT
Lines: 74
NNTP-Posting-Host: apollo.kosone.com
Organization: Kingston Online Services
To: djgpp AT delorie DOT com
DJ-Gateway: from newsgroup comp.os.msdos.djgpp
Precedence: bulk

	I am afraid this will be a long post that will maybe test your knowledge
and maybe make you laugh at me. Hi, i am Brian Oliver, sixteen years old
and a game/demo programmer type. Two days ago I downloaded djgpp and rhide
before that i was using Borland's Turbo C++ 3.0 since about Christmas 97 (i
have only been programming for 10 months). Anway it produced sixteen bit
slow code and didn't provide me with access to extended memory so I
downloaded djgpp. Oh, by the way i use a 486 DX/66 with 32 megs of RAM and
Windows 95. Ok, I have a few questions for you super djgpp users.
	Ok it's a great compiler but i don't know what's going on. First of all I
don't really understand protected mode programming. The first question is,
how do i change the video mode. I have always used inline assembler like
this
	
void set_vid_mode(unsigned char mode)
{
	asm{
		mov al, 0
		mov ah,mode
		int 10h
	}
}		

i don't think that's exactly it, but you get the idea - i can't remember
offhand. Ok my problem isn't AT&T syntax(picked that up in a day) but I am
not sure whether it will work because I am in protected mode. (that's how
little i know about protected mode programming). 
If i understand (and i don't think i do) , cwsdpmi will slam the machine
into real mode, perform the operation and exit. Could someone please
straighten me out on this? If you can point me to resources that would be
great but it would be alot better if you mailed me or
posted to this group.
	Ok, next question	-	how do i write to video memory - i would normally do
it like this

	//set up a pointer
	unsigned char far *vga = (unsigned char far *)0xA0000000;

	then i would write to it

	*(vga + x + (y * 320)) = color;

ok, from my pathetically tiny amount of knowledge i have gained in the past
couple of days i would do this

	unsigned char *vga = (unsigned char *)0xA000;

	then i would write to it the same way

i am pretty sure that that won't work so could you please tell me what i
can do. Since most of the game stuff won't be altered by
jumping to 32 bit protected mode, and this stuff will, could you please
help me? 

	Ok, one more question. I am sure everyone asks someone this question
sometime. I have an interrupt handler that drives the
keyboard. I am sure that this won't work the same way. Could someone please
tell me how to install an interrupt handler.	Ok, to 
drive the mouse, i just poll interrupt table 0x33 - will this work in the
same way? I am also pretty sure that my sound card can't be programmed in
the same way - i use midpak and digpak	- but if anyone has any help on this
i would appreciate it.

	Ok, I thank you very much for bearing with me through this somewhat large
post. I would appreciate it very much if you could help answer any of these
questions or point me to someone or some resources that can. Can you please
e-mail me or post to this group. And if you have any questions that you
think i can answer mail me or post to this group. In general I try to
answer all the questions on a newsgroup that I can correctly answer. Anway,
I thank you in advance for any information.

						Brian Oliver

e-mail me at
markoliv AT mercury DOT kosone DOT com