Routers vs. PC's for routing - was list problems?

Unnamed Administration sources reported that Joseph T. Klein said:

Didn't National Semiconductor have a spec sheet for write only memory
back in the late 70s or early 80s?

I think they developed it for the NSA.

Not exactly. As I recall, National or maybe Signetics had a run
of FUBAR chips. So they gave them xxxNFG part numbers, and had a
data sheet made for "Write Only Memory". The AN showed it being
used as an electronic bitbucket, etc.

This was in 1971 or 72. If you ordered the data sheet/sample;
you likely also got a set of Groucho glasses so "you can sneak
into the office even if your colleagues find out"....

A friend has the data sheet, and maybe still the glasses/nose.