Re: [CAD_CAM_EDM_DRO] Stepster pulse rate control

Hi Elliot,

I haven't looked at the source, but I suspect that a "timing loop" is
used, where the time the loop takes to complete determines the step
rate. Oftentimes a "for/next" loop is used with a loop number to delay
as necessary to make the timing loop come out to the needed speed.
MaxNC probably works this way. The timing is accurate once
"calibrated", but then, all PC's are not created equal (in speed)!

Other programs (like TurboCNC) and code I'm working on use the PC's 8054
timer to generate a precise time period. Art's Master5 uses a special
timer in the Pentium processors for precise timing.

HTH

Alan KM6VV


Elliot Burke wrote:

>
> Has anyone looked at the listing for Stepster?
>
> I looked it over, and don't understand how the pulse rate is controlled.
>
> It looks like it just loops around. Maybe in DOS this can give accurate
> enough timing, its been a while since I did any DOS programming.
>
> Elliot