PDP-8/a cleaning

Pete Turnbull pete at dunnington.plus.com
Tue Apr 25 12:58:21 CDT 2017

On 25/04/2017 17:46, js--- via cctalk wrote:
> On 4/25/2017 11:34 AM, Pete Turnbull via cctalk wrote:

>> 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.

Of course, that's their purpose - foil is impervious to UV, black 
plastic tape and floppy disk write-protect tabs (that's write-enable 
tabs for some of us) are good, though paper is better than nothing.

Pete Turnbull

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