Bill Degnan billdegnan at gmail.com
Mon Feb 5 15:02:19 CST 2018

> On 02/05/2018 02:06 PM, Chuck Guzis via cctalk wrote:
> > On 02/05/2018 10:20 AM, Mark G Thomas via cctalk wrote:
> >
> >> 2) Many of the chips were failing to program because my Batronix
> >>     programmer apparently requires more current than my USB port
> provides.
> >>     This surprised me because I have been programming chips for years
> >>     using this programmer on this computer port successfully, and this
> >>     is the first I have had the problem. Using a Anker powered USB hub
> solved
> >>     things. My Batronix programmer even arrived with a cheap powered hub
> >>     when I ordered it, but I never used it because it was shipped with
> an
> >>     incompatible wall wart, but looking at it in the box gave me the
> idea
> >>     that this might be the issue.
> > You should be aware that many "thin" Far East USB cables will not pass
> > the full USB 1.5A current without substantial voltage drop.   I recently
> > ran into this with a new LG portable DVD drive.  It refused to operate,
> > even though I'd just taken it out of the box.   I replaced the "thin"
> > USB cable with several other "thin" ones that I had with the same
> > result.  Finally, in desperation, I located a "thick" USB cable, plugged
> > the drive in, and discovered that it worked just fine.
> >
> > Moral:  There's a lot of garbage out there.
> >
> > Rant:  The whole scheme of supplying anything but low-current using USB
> > is a terrible idea.  I have a similar gripe with barrel connectors,
> > which don't seem to enforce any standard at all regarding polarity or AC
> > vs. DC.
> >
> > For my own projects I've taken to using mini XLR connectors. Perhaps not
> > optimal, but they're rugged enough.
> >
> > --Chuck
> > My EPROM Programmers all have a connection foir external power
> specifically because sometimes USB can't provide the needed current.
> bill

I was going to say...I would not have thought any USB-powered prom
programmer to be the best solution.  I have two programmers both have their
own wall power connectors and they're reliable.  I am not saying that it
would not be possible that an USB-powered prom programmer would work, but
I'd personally want to stick with something with some legroom.  I always
measure my USB supplies and cables' output to separate out the ones that
don't provide enough umph from those that do.
Happy computing

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