Unidentified chip -- Spoiler for HP 1260-0339

Sean Caron scaron at umich.edu
Thu Aug 6 14:20:37 CDT 2015

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?



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:
>>> 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.
> 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.
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