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PostPosted: Tue May 09, 2017 7:34 pm 

Joined: Wed Nov 09, 2016 7:27 pm
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Has some sort of window on it's top that is reflective but not clear. Is this a EPROM? Do all EPROMs have some sort of clear window?


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PostPosted: Tue May 09, 2017 7:56 pm 
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The two general methods for erasing erasable ICs is electric like this, or light, usually ultra violet. The window just says at some stage the intention of photoelectric process was made that may or may not be actively integrated. Be it rom or sensor.

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PostPosted: Tue May 09, 2017 8:00 pm 
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The R2S3 is a photoelectric sensor.

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PostPosted: Tue May 09, 2017 10:01 pm 

Joined: Wed Nov 09, 2016 7:27 pm
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Thanks, Mr. Lodos.

Seems funny to find it on a meager DVD drive board from an Xbox.

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PostPosted: Tue May 09, 2017 10:09 pm 
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Design doesn't matter as much as code. They had a use, and it was less expensive to use them than something else. Nothing more.

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