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
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Message-ID: <4kda9g$iis@nyheter.chalmers.se>
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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

__________________
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