Mystery device

[Martin Czech]

:::NEC
:::D8279C-2
:::9543X8026

I'm sorry, I can't help you, but:
This is a thing that can really make me mad as devil, when marketing
starts to label our ics. All kinds of minor and major changes, firmware
etc. influence the magic numbers. Even the chip designer doesn't know
what it is about after a few TCs. Ahh, I forgot bond options,
same chip, other names.

I guess some custom chip?

m.c.