Quote Originally Posted by abasir
Either the P166 or the Compaq.

The laptop may have low voltage on the parallel port which may cause some problem with CNC controller and the step rate is limited to about 10kHz. With 4 microstep/step, 200step/rev & 10tpi leadscrew, you max rapid is only 75ipm. The other PCs can triple that theoritical maximum to about 225ipm.
Could you explain a bit more on how to interpret the numbers?