On the EV calc, you can only go back to 1840. Fiddling with the map code, specifically the tear specification, you can actually go back to 1824. I guess what I'm asking is why we can't do that on the EV calc. I was more just pointing that out, but yeah, I guess that's what I'm asking.
I'm guessing Dave was working on updating the maps to get them fully functional and never updated the EV calc options. I'd suggest e-mailing him if you want him to update it.