Someone had posted in the past this website of Aguascalientes where you can look at archive online. He had given the login name and password to get in:

http://sigue.aguascalientes.gob.mx/axweb/

I have been going through it. What else can you do? Can you search the name of a town or surname to narrow the search for lets say testamentos?

Does Jalisco or Zacatecas have an online archive like the above link?