[Coco] EPROM eraser wanted
gene.heskett at verizon.net
Sun Apr 16 01:02:31 EDT 2006
On Saturday 15 April 2006 14:36, Stephen H. Fischer wrote:
>If you have a good lighting store around, you can try and order just
> the lamp tube.
>Then you can put the lamp in place of the regular florescent with the
> same size in any suitable fixture.
>The EPROM eraser is just an ordinary florescent tube with no interior
> white coating.
Correction, its made from quartz, as the glass filters quite a bit of
the UV light needed to erase an erasable eprom. I once taped a 27C64
to a "black light" tube, removing it once a day to check to see if it
was erased. It took about 2 weeks to get the last bit set to a 1, and
apparently that wasn't enough as subsequent programming sessions left
bits that shoulda been a 1 at zero when done. So I ordered an eraser,
which did that job in 18-20 minutes. No more ghost zero's in my burns,
with a homemade burner I'd built. ISTR I paid about $70 for it at the
>It is clear glass with small balls of mercury inside.
>You do have to use it in a way that you cannot look at when it is on
> as it will harm your eyes.
The eraser I have at the tv station is quite small, pack of cigs size,
and its sliding lid is interlocked so well I've never seen the lamp
>The one I have is marked "G8T5...".
>That is : "G8T5" followed by three dots (...) and a warning to avoid
> the rays.
>It may be listed under "Germicidal" in the lamp catalogs.
That one should be a quartz tubed lamp, most of the germicidals were.
I have NDI how long it will take it to wipe a 2764 though. It takes
more than the minimum to get all $FF's out of it, but it can be
overdone according to my reading on that quite a few years ago now.
The effect is that eventually it won't program regardless of how many
write pulses you bang it with.
>Stephen H. Fischer
>Roger Taylor wrote:
>> I'm looking for a used EPROM eraser, doesn't matter how old or ugly
>> it is, as long as it works. Also a 21v power supply if somebody can
>> dig one of those out of your parts stash. Bare wires at the end is
>> ok because I will be soldering it to a 2-hole header for plugging
>> into the Disto EPROM programmer.
>> If you donate it towards the CoCo3.com efforts to create new
>> products, I will return a Portal-9 or Rainbow IDE registration, or
>> if you want cash let me know your asking price.
>> I also want to ask other developers what the most common or popular
>> Windows-based EPROM programmer might be so I can start looking into
>> adding support to my IDEs. I definatetly want to let the users burn
>> their software to ROM right from the IDE if they are creating those
>> kinds of images.
Figure on spending about $800-$1000 or more for a windows/dos based
solution in the one size fits all category. The one I have at the tv
station can be adjusted in the driver to burn virtually any of the
eproms that were popular up to about 6-10 years ago. But as I'd never
bought the extra socket adaptor kits for the newer stuff, I haven't
updated it in quite some time, 7 maybe 8 years now. Its brand name was
"Super"-something I've long since forgotten. I bought it at the time
to fix a problem in a video effects device that the maker wouldn't.
And I did fix it... And a couple of other things while I was at it.
OTOH, the one I made, nearly 30 years ago now, I think I might have had
a $30 bill in it. The most expensive piece was the ZIF socket, which
was about a tenner.
>> Roger Taylor
People having trouble with vz bouncing email to me should add the word
'online' between the 'verizon', and the dot which bypasses vz's
stupid bounce rules. I do use spamassassin too. :-)
Yahoo.com and AOL/TW attorneys please note, additions to the above
message by Gene Heskett are:
Copyright 2006 by Maurice Eugene Heskett, all rights reserved.
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