Re: [CAD_CAM_EDM_DRO] Re: PC based CNC system architecture

Wally K wrote:

> Thanks Matt, You are starting to clear things up for me.
>
> Could you tell me what the motherboard consists of. Is it a passive
> backplane or does it have smarts on it.

The motherboard has only one schmitt trigger chip (74HC14) to
clean up some signals from the parallel port, and invert a signal
going back. It also has 2 RC delays to slow down the strobe
signals that are SUPPOSED to be delayed by the parallel port
chip in the PC until the data lines have settled, but DON'T.
So, no smarts at all.

> On the proposed 4 axis stepper card you are working on. Can you put
> more than 1 card in the motherbord.

Yes, up to 8. If that's not enough, the motherboards are chainable.

> Also on the proposed stepper card why does this ignore the digital
> I/O issue all together.

We're making it modular. Would you want to pay for 4 more axes
when you just need one more digital I/O bit?

> > > Wally K.
> > > And are you physically building a mechanical card cage.
>
> > Matt Replys:
> > Yes, it's actually cheaper than buying a pre made one.

We looked into this last summer, and it was an eye opener!
Totally ridiculous!

Jon