Int B3  - IBM ROM BASIC - Used While In Interpreter
 Int B3 Fn 70  - Zipkey - Get Version
 Int B3 Fn 71  - Zipkey - Convert Two-letter Abbreviation To State Code
 Int B3 Fn 72  - Zipkey - Convert State Code To Two-letter Abbreviation
 Int B3 Fn 73  - Zipkey - Convert State Code To State Name
 Int B3 Fn 74  - Zipkey - Convert Zipcode To Ascii Digits
 Int B3 Fn 75  - Zipkey - Look Up State Code For Zipcode
 Int B3 Fn 76  - Zipkey - Look Up City And State For Zipcode
 Int B3 Fn 77  - Zipkey - Play Back Exit Key For Entry With Given Zipcode
 Int B3 Fn 78  - Zipkey - Look Up Zipcodes For A Given State And City
 Int B3 Fn 79  - Zipkey - Look Up Zipcodes For A Given City
 Int B3 Fn 7A  - Zipkey - Fetch An Entry From A Previous Lookup
 Int B3 Fn 7B  - Zipkey - Get Values Needed To Save Zipkey Context
 Int B3 Fn 7C  - Zipkey - Restore Zipkey Context
 Int B3 Fn 7D  - Zipkey - Request Pop Up
 Int B3 Fn 7E  - Zipkey - Get Name Of Primary City For A Zipcode Region
 Int B3 Fn 7F  - Zipkey - Enable/disable Hotkeys
 Int B3 Fn 80  - Zipkey V2.0+ - Determine State For Area Code