6 Aug
2015
6 Aug
'15
9:22 a.m.
As a total aside, on some HP boards there is a 16 pin
DIL package with the part number 1260-0339.
Any ideas what that chip is?
What chip?
Amazingly there is nothing inside that 16pin DIL package. No silicon chip, no thick-film
resistor
network, nothing. It is just a package with the pins.
The purpose of it? It's a connector (!) to fit one of those IC test clips on to
monitor various signals.
-tony
6 Aug
6 Aug
12:11 p.m.
On Thu, Aug 6, 2015 at 10:22 AM, tony duell <ard at p850ug1.demon.co.uk> wrote:
Amazingly there is nothing inside that 16pin DIL
package. No silicon chip, no thick-film resistor
network, nothing. It is just a package with the pins.
Are you sure? They might have gotten a really good deal on
house-marked Signetics 25120 chips, with not all of the address lines
bonded out.
12:12 p.m.
Amazingly
there is nothing inside that 16pin DIL package. No silicon chip, no thick-film resistor
network, nothing. It is just a package with the pins.
Are you sure? They might have gotten a really good deal on house-marked Signetics 25120 chips, with not all of
the address lines
bonded out.
I've wondered why there wasn't a self-addressing serial version of the 25120, for
First In Never Out stores. That would fit in a 16 pin package I think.
-tony
12:17 p.m.
On Thu, 6 Aug 2015, Eric Smith wrote:
On Thu, Aug 6, 2015 at 10:22 AM, tony duell <ard at
p850ug1.demon.co.uk> wrote:
It could also be a chip used to test an auto-insertion machine or wave
solder machine. If memory serves, they'll use correctly pinned but "fake"
parts to test those processes before moving to the more expensive real
thing.
g.
--
Proud owner of F-15C 80-0007
http://www.f15sim.com - The only one of its kind.
http://www.diy-cockpits.org/coll - Go Collimated or Go Home.
Some people collect things for a hobby. Geeks collect hobbies.
ScarletDME - The red hot Data Management Environment
A Multi-Value database for the masses, not the classes.
http://scarlet.deltasoft.com - Get it _today_!
Amazingly there is nothing inside that 16pin DIL
package. No silicon chip, no thick-film resistor
network, nothing. It is just a package with the pins.
Are you sure? They might have gotten a really good deal on
house-marked Signetics 25120 chips, with not all of the address lines
bonded out. 
12:20 p.m.
It doesn't even shunt across; it's just 16 pins in a DIL package
"floating"? Strange. If it were a manufacturing test, one wouldn't expect
it would show up in production machines?
Best,
Sean
On Thu, Aug 6, 2015 at 3:17 PM, geneb <geneb at deltasoft.com> wrote:
On Thu, 6 Aug 2015, Eric Smith wrote:
On Thu, Aug 6, 2015 at 10:22 AM, tony duell <ard at p850ug1.demon.co.uk>
wrote:
It could also be a chip used to test an auto-insertion machine or wave
solder machine. If memory serves, they'll use correctly pinned but "fake"
parts to test those processes before moving to the more expensive real
thing.
g.
--
Proud owner of F-15C 80-0007
http://www.f15sim.com - The only one of its kind.
http://www.diy-cockpits.org/coll - Go Collimated or Go Home.
Some people collect things for a hobby. Geeks collect hobbies.
ScarletDME - The red hot Data Management Environment
A Multi-Value database for the masses, not the classes.
http://scarlet.deltasoft.com - Get it _today_!
Amazingly there is nothing inside that 16pin DIL
package. No silicon
chip, no thick-film resistor
network, nothing. It is just a package with the pins.
Are you sure? They might have gotten a really good deal on
house-marked Signetics 25120 chips, with not all of the address lines
bonded out.
7 Aug
7 Aug
5:26 a.m.
It doesn't even shunt across; it's just 16 pins in a DIL package
"floating"? Strange. If it were a manufacturing test, one wouldn't expect
it would show up in production machines?
Yes. It is just 16 pins unconnected to each other.
As I mentioned some messages ago it is used as a connector. It's soldered to the
board
so you can fit one of those 'IC Test Clips' on top and pick up 16 signals. I came
across it on
the test board for the HPIB interface for the HP9830 (where it has the HPIB signals wired
to the
pins). Another place you find it is on the test board for the HP Logic Comparator (you
know, the
tool that compares a reference IC signals with those on a chip on a PCB). The Logic
Comparator
has a test clip to fit onto the IC on the board under test in normal use, to test said
Logic Compator
there is a test board with a bit of logic wired to one of these empty 16 pin packages that
you
put the Logic Comparator test clip on.
-tony
6 Aug
6 Aug
12:25 p.m.
It could also be a chip used to test an auto-insertion
machine or wave
solder machine. If memory serves, they'll use correctly pinned but "fake"
parts to test those processes before moving to the more expensive real
thing.
Yes, there were a few companies that made dummy chips for exactly that
reason. These days, the robots are much better, so I doubt the
practice of using dummy chips still exists.
--
Will
12:27 p.m.
Yes, there were a few companies that made dummy chips
for exactly that
reason. These days, the robots are much better, so I doubt the
practice of using dummy chips still exists.
And come to think of it, I bet those dummy chips were used for
training people to hand stuff boards as well.
--
Will
10:02 p.m.
And come to think of it, I bet those dummy chips were used for
training people to hand stuff boards as well.
The Amstrad PCW8256 (word processor) came with 256K of RAM but could be expanded to
512K essentially by adding another 8 41256 DRAM chips. Some companies in the UK sold the
9-chip kits used to expand PCs (with parity memory) for this, telling you to use the extra
chip
to practice with.
However the HP package I mentioned is the only time I've seen one of these dummy chips
used
on a production board.
-tony
12:46 p.m.
On Aug 6, 2015 3:26 PM, "William Donzelli" <wdonzelli at gmail.com>
wrote:
Yes, there were a few companies that made dummy chips for exactly that
reason. These days, the robots are much better, so I doubt the
practice of using dummy chips still exists.
I've got tubes of them if anyone's interested. Not that anyone on this list
would need practicing, but maybe your robots do.
Kyle
3:16 p.m.
On Aug 6, 2015 6:00 PM, "Fred Cisin" <cisin at xenosoft.com> wrote:
Pin-out?
Data sheet?
I'll dig them out when I'm home again in a couple of weeks. I saved them
from the trash, figuring they could at least be used
for art projects. I'll
let them go for the cost of shipping.
Kyle
5:10 p.m.
On 08/06/2015 02:25 PM, William Donzelli wrote:
They definitely still exist. I doubt many people use them
for P&P testing, except maybe the people who MAKE the P&P
machines. But, larger outfits do extensive thermal
profiles, cross-section microscopic examinations of solder
joints and all sorts of exhaustive tests on soldering and
other parts of the process. They use the dummy chips for
testing the quality of these processes. They may run 25
boards with different thermal profiles to find out what
gives the best soldering results.
Jon
It could also
be a chip used to test an auto-insertion machine or wave
solder machine. If memory serves, they'll use correctly pinned but "fake"
parts to test those processes before moving to the more expensive real
thing.
Yes, there were a few companies that made dummy chips for exactly that
reason. These days, the robots are much better, so I doubt the
practice of using dummy chips still exists.
3206
days inactive
3207
days old
12 comments
8 participants
participants (8)
-
ard＠p850ug1.demon.co.uk -
cisin＠xenosoft.com -
elson＠pico-systems.com -
geneb＠deltasoft.com -
kylevowen＠gmail.com -
scaron＠umich.edu -
spacewar＠gmail.com -
wdonzelli＠gmail.com