calculate machine coordinate (urgent)

hi freinds ;

i want to build a pc controlled milling machine and write a windows program for it
so i do not know how calculate x y z axis speed and control them with parallel or serial port.

for example for x=100 and y=200 coordinate how we calculate step per sec for x and y drive .

i need your help.

with best regards
saeed niknami

You might try these links:
wiki.linuxcnc.org/cgi-bin/wiki.pl?TrajectoryControl
wiki.linuxcnc.org/cgi-bin/wiki.pl?Simple_Tp_Notes
linuxcnc.org/docs/html/motion/kinematics.html
linuxcnc.org/docs/html/motion/pid_theory.html

The LinuxCNC source should be here:
git.linuxcnc.org/gitweb?p=linuxcnc.git;a=summary

The LinuxCNC home page and wiki are a good place to start too:
linuxcnc.org/
wiki.linuxcnc.org/cgi-bin/wiki.pl

It may be difficult to find what you are looking for, but in the long run, I think it will be worth the effort.