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AT27C256R-55LC ATMEL 256K

 
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Harald



Joined: 13 May 2011
Posts: 423
Location: Steinberg, Norway

PostPosted: Sat Dec 16, 2017 2:38 pm    Post subject: AT27C256R-55LC ATMEL 256K Reply with quote

Hi there good people,
I can understand Mike (Olympusman) fascination for micro circuits.
Just tested one my self.
This has been photographed through the window of the chip...



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Harald

Lier Fotoklubb / NSFF
AFIAP / CPS
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mawyatt



Joined: 22 Aug 2013
Posts: 1295
Location: Clearwater

PostPosted: Sat Dec 16, 2017 3:26 pm    Post subject: Reply with quote

Harald,

Beautiful image!! Please let us know how you took this image!

Best,

Mike
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Harald



Joined: 13 May 2011
Posts: 423
Location: Steinberg, Norway

PostPosted: Sun Dec 17, 2017 2:57 am    Post subject: Reply with quote

Hi there Mike,
Thank you for your great comment.
The image is taken with Canon EOS 7D and Mitutoyo M Plan APO 5x on Canon EF 70-200. Lightsource is 3x 65w fluorescence bulbs with softing. The circuit is placed inside a light tent. Stack of 44 images stiched together in Zerene PMax.
Minor adjustents in LR.
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Harald

Lier Fotoklubb / NSFF
AFIAP / CPS
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Olympusman



Joined: 15 Jan 2012
Posts: 3572

PostPosted: Sun Dec 17, 2017 10:12 am    Post subject: AMTEL chip Reply with quote

Nice. As I recall, these ICs could be programmed through the window in the package with UV light signals.

Mike
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Michael Reese Much FRMS EMS Bethlehem, Pennsylvania, USA
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mawyatt



Joined: 22 Aug 2013
Posts: 1295
Location: Clearwater

PostPosted: Sun Dec 17, 2017 10:15 am    Post subject: Reply with quote

Mike,

I think these were erased with UV through the window. Programming was done through the usual electrical interface.

Best,

Mike
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ChrisR
Site Admin


Joined: 14 Mar 2009
Posts: 7619
Location: Near London, UK

PostPosted: Sun Dec 17, 2017 12:43 pm    Post subject: Reply with quote

I have some 2708s somewhere. ONE WHOLE KILOBYTE Rolling Eyes
And not Cmos.

We used to erase them by putting them in the envoironmental test chamber for 2 minutes.
Many years ago, I broke the "window" square off one with a hammer and chisel, to take a photo of the chip. I had to sharpen the chisel first, I remember.
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