Re: Performance Limit of Parallel port

[Jon Elson <elson-at-pico-systems.com>]

Till Franitza wrote:

>Hi!
>I used to have a Pentium 133 driving 6 Steppers and they run quite well at a
>steprate of a kiloherz. This really loads the system. It would be a nice
>thing to have a microcontroller receive digital position input from the
>parallelport and generate the steps.
>I guess this is just what PPMC does.
>  
>
My PPMC is an analog-out servo drive, must be closed loop.

My Universal Stepper Controller generates step/direction output, and can 
be used either open or
closed loop.  It offloads the task of generating precisely timed step 
pulses on multiple axes
to hardware in an FPGA, so the CPU can update the velocities every 
millisecond, for instance.

Jon