Randy Lahey

Heres how I changed the schematic to suit this ic. I just changed Tom's original schematic in paint. Notice I used a 5.1 volt zener instead of the 6.2 volt. This is because logic ic's are meant to run on 5 volts. 6.2 volts might work, I havn't tried it, but it is pushing it. The datasheet for this chip says to power it between 4.75 volts and 5.25 volts. I used an old computer power suppy to power this, and since it already puts out a regulated 5 volts, i hooked it straight in without a zener or any regulator. I added a link to the datasheet for this ic in my original comment, it would help to have a look at it.

When hooking up to the parallel port, hook up direction to pin 3 and step to pin 2. Enable doesn't have to be hooked up when testing. If you use kcam, go to setup > port setup > lpt setup. This is the window to setup the pinouts. make sure the are the same as how you wired it. The 74ls169 uses an inverted clock, so in the x direction row, under the inverted column, switch it to true. That step is important or else it won't do anything.

like i say, i've only breadboarded this circuit and got it to turn a motor using kcam, I havn't finished my mill yet. But if you get farther than me, i'd be interested to hear how it goes.