PDP-8/a cleaning

Paul Koning paulkoning at comcast.net
Tue Apr 25 11:53:20 CDT 2017

> On Apr 25, 2017, at 12:46 PM, js--- via cctalk <cctalk at classiccmp.org> wrote:
> 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.

That's what those stickers are for.  Foil is probably pretty effective.  Paper, not so much, because it's rather translucent.


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