[Coco] eprom burner

[Brian Blake]

Hi guys,

I'm good to go on the para-port front - 4 of my five PC's have them...



Brian

On Mon, Mar 29, 2010 at 1:03 PM, Gene Heskett <gene.heskett at verizon.net>wrote:

>  On Monday 29 March 2010, Steven Hirsch wrote:
> >On Mon, 29 Mar 2010, Brian Blake wrote:
> >> I'm looking at buying an eprom burner. I have a few hobbies (including
> >> CoCo's) that require being able to program eproms, PIC's, etc... I've
> >> looked into a number of different types, but, was wondering what
> >> everyone else uses. I've been looking at this Willem devide:
> >>
> >>
> http://cgi.ebay.com/PCB5-0-Willem-EPROM-Programmer-PIC-BIOS-Shipfrom-USA
> >>_W0QQitemZ360201810162QQcmdZViewItemQQptZLH_DefaultDomain_0?hash=item53dd
> >>b370f2
> >
> >That looks like a nice rendering of the Willem design and it's about 1/2
> >of what I paid for mine two years ago.  If you're planning on burning
> >older low-capacity EPROMs, you will definitely want an external power
> >supply.
> >
> >Also, remember that this is "open source" hardware and not a commercial
> >product.  They are not always simple nor straighforward to use, but the
> >information is all out there.
> >
> >Be sure your computer has a real parallel port on it (the USB cable is for
> >power only, believe it or not).  I am not confident that the software will
> >work properly over a USB to parallel adapter.  Worst case, you may have to
> >pickup a PCI parallel card.  I bought one of these from Newegg last year
> >for about $15.
> >
> >Steve
>
> No, it won't work over a usb<->parallel adaptor.  USB's worst case timing
> constraints cannot operate at the timings these devices need to function
> correctly.  All you will do is fry stuff because a 10 microsecond timed
> burn
> cycle might be stretched to 10 milliseconds or worse by USB.
>
> Parport cards are cheap, I have a Rosewell dual port I paid less than $30
> for.  BTW, there are some parport cards (and motherboard installed too!)
> parports out there with a very puny drive capability, and that $15 Newegg
> might be one of them since the poor chipset seems to have about 90% of the
> aftermarket.  IIRC, the chipset you don't want is made by NetMos.  It can't
> even drive an opt-isolator without booster buffers.  Generally, if the
> motherboard claims SuperIO, it will probably be ok.
>
> We find this stuff out on the emc list because emc demands a good parport,
> particularly when using steppers on your mill/lathe.
>
> --
> Cheers, Gene
> "There are four boxes to be used in defense of liberty:
>  soap, ballot, jury, and ammo. Please use in that order."
> -Ed Howdershelt (Author)
>
> Fame may be fleeting but obscurity is forever.
>
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