PDP-8/a cleaning

[js at cimmeri.com]

On 4/25/2017 11:34 AM, Pete Turnbull via 
cctalk wrote:
> On 25/04/2017 15:55, Tapley, Mark via 
> cctalk wrote:
>> On Apr 25, 2017, at 8:51 AM, allison 
>> via cctalk <cctalk at classiccmp.org> 
>> wrote:
>>
>>> Even after all that I'd still dry it 
>>> with a little heat (oven at 180F or 
>>> a clean empty
>>> container in the sun.
>>
>> Irrelevant for backplanes, but for 
>> circuit boards, would any UV-erasable 
>> PROMs want to be checked to ensure 
>> their caps/covers are still in place 
>> before exposure to sunlight?
>
> Definitely.  It takes a while, but 
> even behind window glass (which is 
> barely transparent to short wavelength 
> UV) EPROMs can eventually lose their 
> content.  It happened to a friend who 
> had a machine with no top cover, on a 
> desk under a window, after about 5 
> years.  But in direct sunlight, 
> certainly just hours, and possibly 
> just several tens of minutes if you're 
> unlucky.
>


Is the same true even if they have 
either a paper stick or a foil sticker 
over the eprom window?   I would *guess* 
that stickers slow or stop the process 
altogether.

- J.