OpenEuphoria

Re: dos wait loop

• Posted by "Kat" <gertie at visionsix.com> Apr 01, 2005
• 466 views

On 31 Mar 2005, at 18:27, Derek Parnell wrote:

>
>
> posted by: Derek Parnell <ddparnell at bigpond.com>
>
> Tone =8Akoda wrote:
> >=20
> > jacques desch=EAnes wrote:
> > >=20
> > >=20
> > > maybe this code I wrote in 1996 could help you with delay smaller tha=
n 1
> > > second. just call delay() like you would call sleep()
> >=20
> >=20
> > it doesn't seem to work right: task manager shows 100% CPU usage.
> >=20
> > what i basically need is doEvents() version for dos. some asm command? =
i was
> > searching web, maybe asm hlt ?
> >=20
>
> MS-DOS is not designed to know that other programs may also be running at=
 the
> same time. What are you trying to achieve by 'waiting'?
>
> Anyhow, if you really must, I recommend trapping INT 1C, and when you
> want to 'wait', just count the appropriate number of ticks (65535 per hou=
r) and
> when not waiting, just ignore the interrupts.

Right, this was the basis for making multitasking dos OSs. Just trap the=

clock and save cpu registers, and load the registers saved from the next=

shell to execute in. This method works fine on the Commodore 64.

Kat