[Techtoolslist] What's happening with old 2716/2732

[Dave McGuire]

   Same here.  Xenon flash tubes don't produce much energy at the ~250nm 
wavelength required for EPROM erasure; their emission spectrum typically 
falls off at about 350-400nm.

   They'll crash if photographed while running, sure, but that's due to 
all of those transistors' junctions acting like photodiodes for a few 
milliseconds.  But no erasure will occur.

              -Dave

On 10/25/22 15:01, Andrew Welburn wrote:
> I have photographed games running on my bench with the flash on and exposed windows plenty of times. Older games can freak out and crash/reset but there’s never any long term damage. Nintendo weren’t stupid, uncovered windows are not a great issue unless you have the exact wavelength of light for the needed exposure period at the right strength. The reality is in common use you are unlikely to encounter that set of variables lining up to cause damage.
> 
> Andrew Welburn (mobile)
> 
>> On Oct 25, 2022, at 9:53 AM, John Robertson via Techtoolslist <techtoolslist at flippers.com> wrote:
>>
>> On 2022/10/24 8:41 p.m., Rodger Boots wrote:
>>> I'm more surprised more Nintendo games haven't had this problem.  All it
>>> takes is a lack of window covers and an old-fashioned flash camera.
>>
>> That's interesting - if a strobe tube (like used in a camera flash can actually erase the older EPROMs...I'll have to test that out today. I have these pistols and rifles that use focused strobe tubes to illuminate CDS cells on their targets for a large scale shooting gallery I own on a local midway (Pacific National Exhibition - Vancouver, BC). So it is an easy thing to fire up - so to speak!
>>
>> John :-#)#
>>
>>>
>>>> On Sat, Oct 22, 2022, 8:56 PM Jose Luiz Martins <joseluizmartins at gmail.com>
>>>> wrote:
>>>>
>>>> Hi folks
>>>>
>>>>
>>>> Got some old 1980's Taito boards to fix and surprise! All 2716 are blank!
>>>> This happened with about 5 boards and more than 40 ICs most of them are
>>>> 2716 but some 2732 too.
>>>>
>>>> Do you guys is experiencing something like this?
>>>>
>>>>
>>>> Thanks!
>>>>
>>>> JL
>>
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-- 
Dave McGuire
McGuire Scientific Services, LLC
New Kensington, PA