HP Portable Plus ... until 2039?

[Michael Fehlhammer]

Yes Etienne, Dave, please let us know if you were successful with that modification!
Obviously this NEC V30 CPU comes in different ... hmm ... flavours:
What's the difference between the 70116D and uPD70116C ( both having DIP40 form factor and 8 MHz clock speed )?
Different power consumption, perhaps? What would be best choice for the PP - speed upgrade?

Another question for our hardware experts:
Would it be possible - at reasonable effort - to equip the PP with an 8087 math coprocessor?
I love fast math floating point routines! :-)