On 2018-02-05 8:00 PM, Chuck Guzis via cctalk wrote:
On 02/05/2018 01:02 PM, Bill Degnan via cctalk wrote:
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
I don't use one now, but I used to have a USB-powered programmer and it
worked okay for GALs and 27Cxxxx UV EPROMs as well as EEPROMs.
However, if I were using older parts, I'm not so sure.
The interesting thing is that upon opening the thing up, you could see
pads for a wall-wart barrel jack (unpopulated). So who knows, perhaps
Bill's USB programmer is similarly equipped.
I still use an older Xeltek Superpro for most things. It does the job.
--Chuck
I have a USB programmer I never use, the electronics in it where too
weak to drive NMOS EPROMs even with external power but was ok with CMOS
parts. I have an old Xeltex Unipro and a Superpro as well as a more
mdern parallel port Xeltex superpro/280 and a Advin badged USB Xeltex
that uses external power they are all much more reliable but I have
found a couple programming algorithms for small AMD PLDs that are
broken. The old Unipro came in handy when I needed to program some
bipolar PROMs.
Paul.
