Xref:	news2.mv.net comp.os.msdos.djgpp:2567
From:	Arash <ei39594 AT ios DOT chalmers DOT se>
Newsgroups:	comp.os.msdos.djgpp
Subject:	slow interrupts - AGAIN!
Date:	9 Apr 1996 09:22:56 GMT
Organization:	Chalmers University of Technology
Lines:	51
Message-ID:	<4kda9g$iis@nyheter.chalmers.se>
NNTP-Posting-Host:	sv31976.ios.chalmers.se
Mime-Version:	1.0
To:	djgpp AT delorie DOT com
DJ-Gateway:	from newsgroup comp.os.msdos.djgpp

Hi' guys

After reading info files in hours, I finally manged to write my own 
keyboard-handler at INT 0x9. Since I used a pmode interrupt, my program 
does something wired (like pgaing or changing to realmode??) thats causes 
my screen refresh rate go down to a value of about 70 screens/sec 
compared to original 150 screens/sec (yes, this is what i call FAST 
graphics!) when I put my finger on a key :(

I tried to write a realmode handler , I fallowed the libc-info examples 
AND the read the FAQ AND looked at some example files, but my program 
just crashes, maybe becuase I'm useing a global buffer that will be 
accessed both from the pmode program and rmode handler, the code looks 
like this ( and worked just fine in pmode):

***********
unsigned char Keyboard[128];
unsigned long save_eax;
..

void my_int9(void){
 asm("movl %eax,_save_eax"); 
 int Key = inportb(0x60);
 if(Key & 128) Keyboard[Key & 127] = 0; // a break code
 else Keyboard[Key] = 1;  // a make code
 asm("movl _save_eax,%eax");
 }

..
// somewhere in main()
 if(Keyboard[1]) esc_down(); // read from the keyboard buffer
..
************

(I didn't include interrupt installer since it's exactly the same as the 
on in the info-files.)



Hope someone can help

TIA,
Arash

__________________
* Wanna make your old 386 as fast as a Pentium??? Try running Win95 (on 
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