> Recently I desoldered several old PCB's I got around 25 mysterious chips
> that seem to be manufactured by Texas Instruments. They are labeled 81C28=
5T
> on what (usually) is the part number line and 210895 on the date line
> (August, 21, 1995) in a 16 SOIC package. I also got what i apparently a p=
in
> for pin compatible chip marked as INB627, 1821-0895, by Motorola? from an
> identical PCB from another [same model] board.
>=20
> I cannot find a datasheet for either of these chips (yes, google has fail=
ed
> me) and it would be greatly appreciated if someone could send me a link t=
o
> it

Are these PCBs from an HP manufactured product? The 1821-0895 number looks =
like an HP in-house part number.

One trick that may be worth trying is to look on the underside of the chips=
, there may be a generic part number there, I had this happen with an HP pl=
otter that I acquired. The company had two of them, one faulty, one working=
, and by swapping the pluggable chips between them identified the faulty it=
em. HP wouldn't supply a chip, so I said my bench could be a trash can for =
it. On looking at the underside of the chip I found '6802', and the chip wa=
s a Motorola one, so replacing it with a 6802 from another piece of equipme=
nt got me a working plotter for nothing.
--=20
Scanned by iCritical.

--=20
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