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- Newsgroups: comp.sys.ibm.pc.hardware
- Path: sparky!uunet!zaphod.mps.ohio-state.edu!swrinde!cs.utexas.edu!asuvax!chnews!hfglobe!ptd!ssivakum
- From: ssivakum@ptdcs2.intel.com (Sam Sivakumar)
- Subject: Re: What's the deal? My chip says "SX-25"; Norton says "SX-33"
- Message-ID: <1993Jan5.184502.24931@ptdcs2.intel.com>
- Organization: Intel Corporation -- Aloha, Oregon
- References: <1992Dec30.233238.14371@ptdcs2.intel.com> <C0CoGq.1ww@usenet.ucs.indiana.edu> <1993Jan5.151627.9623@bmers95.bnr.ca>
- Date: Tue, 5 Jan 1993 18:45:02 GMT
- Lines: 33
-
- In article <1993Jan5.151627.9623@bmers95.bnr.ca> khor@bnr.ca writes:
- >|>
- >|> Perhaps they wouldn't give away the latest 486-66/DX2 but surely there
- >|> are old 286 wafers lying around somewhere..
- >|>
- >I dunno what they do with the wafers, but they are unsightly. Good dice
- >are taken out to be assembled as IC's and the remaining bad dice scattered
- >across the wafer are all inked anyway.
- >
- Why, they adorn the walls of the offices of Intel employees, of
- course! :-)
- Actually, after the wafers leave the fabrication line, the backsides
- are ground and they are goldplated. So, any rejected wafers are usually sent
- through some kind of reclaim line where all the gold is reclaimed. Also, the
- various layers on the wafers can be stripped off and the wafers can be reused
- for various engineering and maintenance type work (not for products, of course). Of course, a not insignificant percentage of these wafers end up at
- the desks of the engineers and technicians. There are a lot of old timers
- around that have wafers of every size that has been used for production, all
- the way from 2 inch diameter to the current 8 inch standard. I have also
- seen 10 inch wafers which I believe are in pilot lines in some places if not
- in actual production, and a 12 inch wafer that was the most mindboggling
- thing that I have ever seen. (Picture attempting to grow a 75 angstrom thick
- gate oxide with less than 5 angstroms variation across a 12 inch diameter
- piece of silicon!).
- It is quite amazing how far this industry has come in barely 25 years.
- The modern 3 million transistor microprocessor is quite possibly the pinnacle
- of human technological achievement.
-
-
- --
- Sam Sivakumar | Intel's very own lithography dude,
- ssivakum@ptdcs5.intel.com | Speakin' for himself, that's for sure!
- PTD, Aloha, OR |
-