Unidentified chip -- Spoiler for HP 1260-0339

[tony duell]

> > 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

Well, I've not x-rayed one, but I could detect no conductivity or diode junctons between
the pins.

> 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