12 Nov
2002
12 Nov
'02
7:47 a.m.
I'm curious if anyone can ID this chip on eBay:
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=2070850586&rd=1
Does anyone know what the purpose/function of the holes in it are?!
Ben
12 Nov
12 Nov
9:14 a.m.
Not very special. AFAIK these holes are part of the production (assembly line) process.
Ed
Benedict Bridgewater wrote:
I'm curious if anyone can ID this chip on eBay:
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=2070850586&rd=1
Does anyone know what the purpose/function of the holes in it are?!
Ben
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9:21 a.m.
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=2070850586&rd=1
Does anyone know what the purpose/function of the holes in it are?
They're away from the "chip" proper so probably
not important. My guess is for a two fingered
assembly gripper to get it.
John A.
9:25 a.m.
DIP packages where still relatively new in the early 70's. Most of the IC's
that I worked with in the 60's into the late 60's and early 70's were
typically flat-packs, or TO-5 style either in metal or molded plastic cases.
This is a big chip with 40 pins. It is my guess that the holes where there
to assure alignment during DIP insertion. I remember when DIPs came out. I
never thought they would last. Boy was I wrong. Regards - Mike
Mike B. Feher, N4FS
89 Arnold Blvd.
Howell NJ, 07731
(732) 901-9193
----- Original Message -----
From: "Benedict Bridgewater" <benb(a)Basit.COM>
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=2070850586&rd=1
Does anyone know what the purpose/function of the holes in it are?!
Ben
1:14 p.m.
Does anyone know what the purpose/function of the
holes in it are?!
Ben
Those one round and slot holes is for manufacturing process, simply
drops onto bed with two precision-machined pins to keep things in
alignment. This is especially necessary because chip bonding and
wire bonding, lid placing and soldering process is mostly mechanical.
Later on when processing becomes powerful enough for optical
alignment on the fly, that holes disappeared.
Cheers,
Wizard
20 Nov
20 Nov
7:19 a.m.
Wizard wrote:
Those one round and slot holes is for manufacturing
process, simply
drops onto bed with two precision-machined pins to keep things in
alignment. This is especially necessary because chip bonding and
wire bonding, lid placing and soldering process is mostly mechanical.
Later on when processing becomes powerful enough for optical
alignment on the fly, that holes disappeared.
Thanks, Wizard, and also to the others that replied.
When I saw it all that could come to mind was that maybe they were
related to holding the chip in the board it was destined for ... I
remember an ECG machine I wrote the software for where the 68000 (the
*large* DIP) in the prototypes had to be "tied down" with a cable tie
around the socket to stop itself from thermally walking out of it! I
read that the Apple III had a similar problem with a lot of it's chips.
Ben
P.S. Just for the record I'm not a chip collector, although I can't
blame a scrapper for selling off whatever he can of a system that's
destined to be recycled. Obviously it's too bad if a collectible machine
gets scrapped, but the number of collectors isn't large enough to ensure
otherwise.
7921
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5 comments
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participants (6)
-
allain＠panix.com -
benb＠Basit.COM -
bennyb＠ntplx.net -
jpero＠sympatico.ca -
n4fs＠monmouth.com -
quapla＠xs4all.nl