No..if you remove the cable, then the signal floats and noise can drive the motor. All you proved is the breakout board seems to work. ( seems to..)
Basicallly, you seem to have no output from the printer port. Id double check that 378 thing..it shoudl read 0x378, but only if under the resource tab of your device managers
printer port entry also shows 0x378, otherwise it may be wrong. Your pulse freq is jumping too much but it should work anyway if the printer port is OK.
Measure the port pin with the cable off to see if the voltage changes from roughly 5 volts to zero on the DIR pin. For example if the DIR pin is
pin 3, then measure from pin3 to pin 25 ( ground) and see if it toggles when you jog one way then the other. You cant measure a step pin, its frequency is
too fast. If the DIR pin is working, then the step pin is likely fine too. If the DIR pin works, then you may just need a wider step pulse , but see if the DIR Pin is OK
forst, its the best way to start.
Art