HP82143 Processor details

[blackjetrock]

it turns out that I have an HP82143 printer. It's suffered from quite a lot of battery leakage and I'm not sure it will work. So, an ideal candidate for ROM extraction.
I've removed the IC from the PCB and put a socket in.

The IC markings:
   

No mention of 3870, but if you look at the underside of the IC:
   

Next step is to build a ROM extraction widget and have a go at getting the code out...