Unidentified chip -- Spoiler for HP 1260-0339

[Eric Smith]

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.