From:	Gary Preston <gary AT prestons DOT demon DOT co DOT uk>
Newsgroups:	comp.os.msdos.djgpp
Subject:	Keyboard.
Date:	Wed, 11 Jun 1997 17:35:23 +0100
Organization:	None
Distribution:	world
Message-ID:	<OUiugBALPtnzEw9k@prestons.demon.co.uk>
NNTP-Posting-Host:	prestons.demon.co.uk
MIME-Version:	1.0
Lines:	72
To:	djgpp AT delorie DOT com
DJ-Gateway:	from newsgroup comp.os.msdos.djgpp

  Hi, I've written a pong game ( yes I know old but sweet ) the reason
is I'm trying to get used to using djgpp, now I've used getch() to read
the keys which is ok ish but I'd rather use the keyboard routines I've
used in my 16 bit games (see below ). If there is a better way I'd like
to know eventually I will try and prot my keyboard handler but for now
any help on the below routine is greatly appreciated. I've also included
my attempt of porting it.

unsigned char Get_Scan_Code( void )
{

asm{
  mov ah, 01h
  int 16h
  jz empty
  mov ah, 00h
  int 16h
  mov al, ah
  xor ah, ah
  jmp one

empty:
  xor ax,ax
done:

}

}


This is how I've tried to port it but I don't really understand what I
have done below which is why I don't have a clue how to get it to work

H E L P !!!! P L E A S E !!!


int Get_Scan_Code()
{
int i = 1;
__asm__ ("
  mov $0x01, %%ah\n
  int $0x16\n
  jz  empty\n
  mov $0x00, %%ah\n
  int $0x16\n


  mov %%ah, %%al\n
  xor %%ah, %%ah\n
  jmp done\n
empty:
  xor %%ax, %%ax\n

done:

  mov %%ax, %0

          "
          : "=g" (i)
  );

return i;

}



-- 
Gary Preston. Gary AT prestons DOT demon DOT co DOT uk
Last game (SpaceFighter) available from my web page:
http://www.prestons.demon.co.uk/index.html
Its only a bug if someone else wrote it, otherwise its a special feature.

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