Re: PCI 4 axis step and direction board

Hello,

At Boondog.com (or some similar) there is described a DIY pport card
which uses the venerable 8255. This could easily provide step/dir
interface in an isa/eisa format.

Hope this helps,

Ballendo

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "ibewgypsie"
<ibewgypsie@h...> wrote:

> Howdy..
>
> I bought a PCI card for OPTO-22 products, it has 24 fixed I/O.

Problem with

> some software is the addresses it sets at. I have a couple of the

older ones,

> that fit a isa slot.. I have used them a lot with the pamux type

I/o

>
> I use a 7414 hex inverter (simple to make) hooked to step/dir

pins on my

> machine. It invertes and has a schmitt trigger output and helps to

isolate the

> parallel port from the drives.. As you probably know you have to

invert the

> signal to a sinking signal and the port by my meter is a positive

one.. THEN

> using the old legend 4 I/O opto cards bought on ebay I input the

home

> switches and output the drive signal for the inverter, coolant and
> accessories.. this way you don't hardly have anything in your logic

system..

> Opto-22 boards go for less than $10 on ebay. There are different

types thou,

> negative and positive logic.. you have to read the pdfs online..
>
> David..
>
>
>
>
> --- In CAD_CAM_EDM_DRO@yahoogroups.com, "ballendo" <ballendo@y...>
> wrote:
> > Hello,
> >
> > The only folks I know selling driver cards like this these days

are

> > Microkinetics and Arrick robotics... (both are isa or eisa, not

PCI)

> >
> > Though I'm sure there are others. Less than before, though. Most

have

> > gone to external drives.
> >
> > Now if you mean a motion contol card, rather than a drive card...

I

> > don;t know of ANY that can compete price wise with the s/w based

pc

> > controllers. Feature-wise, some can still top the s/w solutions.

But

> > not in "cheap" price range, IMO.
> >
> > Hope this helps,
> >
> > Ballendo
> >
> > --- In CAD_CAM_EDM_DRO@yahoogroups.com, tommy clay
> <tclay_35117@y...>
> > wrote:
> > > anybody know a good inexpensive PSI (can also use ISA)
> > > step and direction board for CNC?
> > >
> > > __________________________________
> > > Do you Yahoo!?
> > > Yahoo! Finance Tax Center - File online. File on time.
> > > http://taxes.yahoo.com/filing.html