[Coco] eprom burner
random.rodder at gmail.com
Mon Mar 29 13:12:52 EDT 2010
I'm good to go on the para-port front - 4 of my five PC's have them...
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:
> >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
> >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.
> 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
> 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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