Re: [CAD_CAM_EDM_DRO] Re: DeskNC Windows version

The 16F877 ICE question is answered in another message.

On the PCI 'wire wrapping'. The problem with hand crafting PCI boards is the
decode logic. The only practical way I've found is using an FPGA with that
all taken care of. The downside is, it's very expensive for the FPGA tools
and I haven't found a freeware PCI VHDL or Verilog file that works. Buying
them from the FPGA guys is too expensive unless you plan on building a few
hundred thousand boards. Sorry, a 16L8 PLD just won't cut it for PCI.

I built an ISA signal generator board several years ago with 3 full ports to
keep from having to use 3 parallel port cards or a multiport board. I would
have done this for PCI had the cost of admission not been so high.

The latest system board I bought has NO ISA slots. The industry is phasing
out the parallel and serial ports. CNC controllers are going to have to
embrace PCI or USB in the fairly near future.

later,
Larry E.

----- Original Message -----
From: "Alan Marconett KM6VV" <KM6VV@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Friday, April 20, 2001 4:53 PM
Subject: Re: [CAD_CAM_EDM_DRO] Re: DeskNC Windows version


> Hi Chris,
>
> I did three 8253' on a xt board several years ago (robot project). OK,
> 15 years ago. You can generate lots of rates, but the granularity of
> available step rates gets bad at the high end, as has been mentioned.
> PCI? I have no Idea. Doesn't sound like it's easy to wire wrap a board
> for.
>
> The DeskNC sounds like a step in the right direction (Ha! pun
> intended). Or it might be fun to build up a PIC hung on a serial port!
> I'm waiting to see/hear about DeskNC solution! If I understand
> correctly, an interface specification will be available in the future!
>
> Alan KM6VV
> (anyone know of a good 16F877 ICE?)
>
>
> stratton@... wrote:
> >
> > > From: beer@...
> > > <s>
> > > >Strange, what we're talking about today in terms of timing pulse
> > > >limitations comes about as a result of an IBM design decision in
> > > >1979/80.
> >
> > Hmm, are there any real interrupt lines accessable on the bus in this
> > day of PCI bridges and all?
> >
> > If one were dealing with an original IBM PC, it would be a simple
> > matter to change the clock source to the 8253... now that it's all
> > buried in a chipset that would be more difficult, but one might be
> > able to set up an 8253/4 on a little board to generate interrupts on a
> > different channel.
> >
> > Chris
>
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