|Check to see if it has a built-in modem...is there place to plug in a phone line?|
If so...just connect the phone line and contact a dail-up ISP that has a local dailup number in your area (start with the local phone company).
If not....get a USB dailup modem (Radio Shack will often have them...or order from someplace like TigerDirect.com)...THEN contact a local dialup isp.
Once you contact a local isp that provides dailup (most phone companies do)...they will take you the rest of the way.
***Please note though...dialup can be surprisingly expensive. Often, if you already have local wired telephone service...you can get entry level DSL for just a few dollars more (in a bundled package)....IF it is provided in your geographic area. I'd check / compare the prices and availability of that first before going with dialup (if you have not checked this already).
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