Table schema:
CREATE TABLE table_name_18 (chipset_based_on VARCHAR, retail_name VARCHAR, digital_analog_signal VARCHAR, available_interface VARCHAR)

Question: What is the Chipset based on with a Digital/analog signal of analog, with an Available interface of agp, with Retail name with all-in-wonder 9800?
SQL: SELECT chipset_based_on FROM table_name_18 WHERE digital_analog_signal = "analog" AND available_interface = "agp" AND retail_name = "all-in-wonder 9800"