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They actually specify that this is a PIC12C5xx in the datasheet. Still, a fun part. :)

Are they in that type of business generally?

Their ELM327 OBD chip is also a PIC: https://en.wikipedia.org/wiki/ELM327

Seems like. It's a fairly practical model for a lot of simpler devices. I've seen dedicated mouse controllers along similar lines. Microchip themselves produce a number of devices that I'm sure are PIC-based internally too.

It's been mentioned that their USB-serial converters are PICs that failed tests of other peripherals:

http://hackaday.com/2011/01/18/mcp2200-usb-to-serial-chip-ha...

One of the code samples they have on the site is a USB-serial converter, so it is likely to be running that firmware too.

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