[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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