27 Jun
2005
27 Jun
'05
6:06 p.m.
ps. are 2716's known for failure in this way?
Yes, especially if they've been flash photographed.
(Ididot photographer killed three of eight EPROMs
on a control system card after being told not to
use the flash in the equipment room.)
Some EPROMS that fail can be reprogrammed, some fail
permanently often in blocks.
If it was a school machine, or anywhere where it was
mostly on, then problems will begin to show after 10
years or so.
Lee.
.
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27 Jun
27 Jun
11:24 p.m.
On Tue, 2005-06-28 at 02:06 +0100, lee davison wrote:
We had something like this on a building security system, c. 1986, in
what was destined to be the Auckland Stock Exchange. We'd just finished
installing it on behalf of the manufacturers/suppliers, and they were so
pleased with it that they decided to take some photos of the various
cabinets.
On the first flash the whole system crashed, stopping anyone from
getting through doors or pressing lift (elevator) buttons. It wasn't
actually controlling the lifts themselves, that was probably still good
chunky flash-resistant relays.
The system recovered after a power cycle. They decided it would be a
good idea to cover the EPROMs with the nice metallised stickers, rather
than coloured paper ones.
--
Lawrence Wilkinson lawrence at ljw.me.uk
The IBM 360/30 page http://www.ljw.me.uk/ibm360
ps. are
2716's known for failure in this way?
Yes, especially if they've been flash photographed.
(Ididot photographer killed three of eight EPROMs
on a control system card after being told not to
use the flash in the equipment room.) 
11:42 p.m.
lee davison wrote:
On that note, are UV LEDs powerful enough to erase EPROMs? I'm thinking
about building an eraser, and want to try an alternative to the rather
expensive and fragile UV tube.
Gordon.
ps. are
2716's known for failure in this way?
Yes, especially if they've been flash photographed.
(Ididot photographer killed three of eight EPROMs
on a control system card after being told not to
use the flash in the equipment room.) 
28 Jun
28 Jun
12:18 a.m.
In message <42C0F150.9040303 at gjcp.net>
Gordon JC Pearce <gordon at gjcp.net> wrote:
On that note, are UV LEDs powerful enough to erase
EPROMs? I'm thinking
about building an eraser, and want to try an alternative to the rather
expensive and fragile UV tube.
I doubt it. IIRC the wavelength is wrong - you need 253.7nm ("germicidal
ultraviolet") to erase EPROMs. You might be able to get a UV LED to do it,
but it'll take a long while to erase.
Magenta sell an EPROM eraser kit - that might be worth a try. At last check
it was about ?30.
Later.
--
Phil. | Acorn Risc PC600 Mk3, SA202, 64MB, 6GB,
philpem at philpem.me.uk | ViewFinder, 10BaseT Ethernet, 2-slice,
http://www.philpem.me.uk/ | 48xCD, ARCINv6c IDE, SCSI
... I would if I could but I can't but I might if I find I can later.
7:40 p.m.
On Tue, 28 Jun 2005 08:18:09 +0100
Philip Pemberton <philpem at dsl.pipex.com> wrote:
In message <42C0F150.9040303 at gjcp.net>
Gordon JC Pearce <gordon at gjcp.net> wrote:
I have a germicidal cabinet for erasing EPROMs. In it's original life,
it was a goggle cabinet for a high school metal shop. Big racks in it
for a whole classroom full of goggles, and lined inside with mirrors.
And an interlock, of course.
I never really need to erase the quantity of EPROMs it is capable of.
On that note, are UV LEDs powerful enough to
erase EPROMs? I'm
thinking about building an eraser, and want to try an alternative to
the rather expensive and fragile UV tube.
I doubt it. IIRC the wavelength is wrong - you need 253.7nm
("germicidal ultraviolet") to erase EPROMs. You might be able to get a
UV LED to do it, but it'll take a long while to erase.
Magenta sell an EPROM eraser kit - that might be worth a try. At last
check it was about ?30.
10:42 a.m.
On that note, are UV LEDs powerful enough to erase
EPROMs? I'm thinking
I think they're far too long a wavelength.
about building an eraser, and want to try an
alternative to the rather
expensive and fragile UV tube.
That is the only moderately-expensive component though. The rest of the
circuitry is the same as to drive a normal fluorescent tube of the same
size/power.... You can, of coruse, get the right UV tube as a spare for
a commerical EPROM eraser.
-tony
10:36 a.m.
ps. are 2716's known for failure in this way?
Yes, especially if they've been flash photographed.
(Ididot photographer killed three of eight EPROMs
on a control system card after being told not to
use the flash in the equipment room.)
6898
days inactive
6899
days old
6 comments
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participants (6)
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ard＠p850ug1.demon.co.uk -
chenmel＠earthlink.net -
gordon＠gjcp.net -
leeedavison＠yahoo.co.uk -
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philpem＠dsl.pipex.com