Re: re:Getting Parallel port to run relay

--- In CAD_CAM_EDM_DRO@yahoogroups.com, <lanebarr@b...> wrote:

> > Any thoughts on damage to computer?
> >
> > Any pointers on assessing computer damage?
> >
> > Hard to believe there isn't a plug and play device just for this,
> > but have had no luck finding anything.
> >
> > First cuts looked surprisingly good and had High hopes.

Depression

> > is now setting in quickly.
> >
> > Any advice greatly appreciated.
> >
> Well it sounds like you toasted your printer port. Go to the BIOS

and disable it. Plug in a replacement printer port. If you have ISA
it will be surplus if you have PCI it will be about $25-$35.

>
> To start with always use a plug-in printer port for prototyping.

If you fry it you can take it out and replace it.

> Once the boards are built, mounted, tested, heatsinked, faned,

tested ....(well you get the idea) then you can hook up to the
internal port.

>
> You might want to avoid the game port at first.....programming it

is a little harder. And you have plenty of signals on the printer
port. Add another if needed.

>
> Breadboard your circuit and work back from the relay
>
> Simulate the printer porrt with a ttl gate (they are tougher than

CMOS) from the 7400 family.

>
> only hook to the computer after everything works for a few days.
>
> good luck!!

> Thanks for the reply Lane,

Was not using serial port for signals only pin one for 5v power
ground referenced to power supply.
Any idea why transistor didn't fire with 5v to Base but did fire
when colector and base were shorted?

Just checked computer and the Parallel port tape goes directly to
mother board - couldn't see manufacturer but its an AMD K6 2/500
Processor. Will I still be able to add new parallel port to plugins
such as the other cards are in video, sound card, usb(not needed)
ect.?? or should I start looking for new motherboard??

>
>

Thanks again for your response,
Brent Mendel
Hopeful CNC Creator