[Coco] 30 years...time flies

[Dave Philipsen]

Yes, I suppose that would do it over a period of time.  An interesting 
fact: did you know the window on erasable PROMs is made out of a special 
fused quartz glass?  This allows the necessary UV rays to pass more 
readily.  So practically anything, even regular glass, would impede the 
wholesale penetration of UV rays. Some EPROMs called OTPROMs are 
electrically identical but don't have the glass window. I remember Marty 
Goodman once stated that EPROMs could also be erased with the next 
higher frequency of electro-magnetic radiation, X-rays.

Dave


On 3/22/2017 12:39 PM, Bill Gunshannon wrote:
> ________________________________________
> From: Coco [coco-bounces at maltedmedia.com] on behalf of Gene Heskett [gheskett at shentel.net]
> Sent: Wednesday, March 22, 2017 11:34 AM
> To: coco at maltedmedia.com
> Subject: Re: [Coco] 30 years...time flies
>
> On Wednesday 22 March 2017 11:07:35 Dave Philipsen wrote:
>
>> Bit rot with EPROMs? I'll have to hear the story on that one! 😂
>>
>> Dave
> I've had it happen. Took years though.  Whomever programmed it didn't put
> a sticker on the window, and it was in a well lit, daylight FL room with
> a vented cover the light could shine right thru.
>
> I've erased them on purpose by putting them out in the sun for 10 days or
> so too.
>
> ___________________________________________
>
> Trust me, they will do it in the dark sealed inside their devices, too.
> It's what happened to my DECTalk box.  Took the EPROMS out and tried
> to verif ythem against HEX files using my programmer and none of them
> verified.  EPROMS were still good as I was able to erase and reprogram
> them.
>
> EPROMs are as permanent as putting something on the Web.  :-)
>
> bill
>
>