Re: Timing problems

[John Coppens <john@jcoppens.com>]

On Fri, 22 Jun 2007 17:40:42 +1000
Clarence Dang <clarencedang@yahoo.com> wrote:

> On Wednesday 20 June 2007 15:08, John Coppens wrote:

> > I suspect this program uses the DOS 18.xxx Hz timer for its loops. Is
> > the emulation of the timer under DOSEMU the same frequency? Does it
> > depend on setting up the 250/1000 tick/s of the kernel?
> 
> DOSEMU can handle about 100 Hz for the PIT.
> 
> I have a patch I can dig up that can go up to 250 (or even 1000
> depending on the kernel version).  It's just a quick hack and not the
> proper solution though.

Hi Clarence,

Thanks for the reply, and my apologies for the delay in confirming...

In reality, the problem is the other way around - I have the impression
that DOSEMU is using anything but 18.29 Hz. At least the program is not
responding the same way under DOSEMU as in real DOS, which causes the
login sequence to fail.

It's rather strange really - using the normal serial port, I get one kind
of behaviour, and using an USB to serial converter, DOSEMU responds
completely differently (none of them correct). I'm somewhat at a loss
where to look for solutions here...

John