strange getch+keybhit beheaviour

[simnav]

In the following code something strange happens ! If I keep pressed any
of ALT+Arrow, keys, they are extracted two times from buffer then getch
seems to stop; if I release and press again ALT+arrow nothing changes:
the only way to exit from this condition is press another key a single
time.
What seems to happen is that kbhit say some keys are present in buffer
but for getch don't see any data and waits for a key. Why this happen ?
If I remove the delay all is working correctly. I've inserted a delay
to reproduce thi problem that I've found on another bigger project
where loop delay is 155ms.
Last thing: I've verified this problem only on newer motherboards !

Please help me !!
Thank you.
Simone
#include <stdio.h>
#include <dpmi.h>

int Handle()
{
int vv;

int lo, hi;

__dpmi_regs reg;

reg.x.ax = 0x10 << 8; /* shift 10h into AH */
__dpmi_int( 0x16, &reg);

vv= reg.x.ax ;
lo = vv & 0X00FF;
hi= ( vv & 0XFF00) >8;
vv=( ((lo == 0)|(lo == 224)) ? hi+256 : lo);

return vv;

} // Handle
int main(void)
{
int i;

do
{
i=0;
while(kbhit())
{
fprintf(stdout, "i=%d\n",i+ +);
fprintf(stdout, "%c\n",getch()) ;
}

fprintf(stdout, "%d\n",Handle() );
delay(155);

} while(1);
}

[CBFalconer]

simnav wrote:

>
In the following code something strange happens ! If I keep pressed any
of ALT+Arrow, keys, they are extracted two times from buffer then getch

There is no point to posting the same query three times in two
minutes. Allow at least a day for replies to appear. But don't
count on them.

--
Some informative links:
news:news.annou nce.newusers
http://www.geocities.com/nnqweb/
http://www.catb.org/~esr/faqs/smart-questions.html
http://www.caliburn.nl/topposting.html
http://www.netmeister.org/news/learn2quote.html

--
Posted via a free Usenet account from http://www.teranews.com