B3 - IBM ROM BASIC - used while in interpreter
 B370 - ZIPKEY - GET VERSION
 B371 - ZIPKEY - CONVERT TWO-LETTER ABBREVIATION TO STATE CODE
 B372 - ZIPKEY - CONVERT STATE CODE TO TWO-LETTER ABBREVIATION
 B373 - ZIPKEY - CONVERT STATE CODE TO STATE NAME
 B374 - ZIPKEY - CONVERT ZIPCODE TO ASCII DIGITS
 B375 - ZIPKEY - LOOK UP STATE CODE FOR ZIPCODE
 B376 - ZIPKEY - LOOK UP CITY AND STATE FOR ZIPCODE
 B377 - ZIPKEY - PLAY BACK EXIT KEY FOR ENTRY WITH GIVEN ZIPCODE
 B378 - ZIPKEY - LOOK UP ZIPCODES FOR A GIVEN STATE AND CITY
 B379 - ZIPKEY - LOOK UP ZIPCODES FOR A GIVEN CITY
 B37A - ZIPKEY - FETCH AN ENTRY FROM A PREVIOUS LOOKUP
 B37B - ZIPKEY - GET VALUES NEEDED TO SAVE ZIPKEY CONTEXT
 B37C - ZIPKEY - RESTORE ZIPKEY CONTEXT
 B37D - ZIPKEY - REQUEST POP UP
 B37E - ZIPKEY - GET NAME OF PRIMARY CITY FOR A ZIPCODE REGION
 B37F - ZIPKEY - ENABLE/DISABLE HOTKEYS
 B380 - ZIPKEY v2.0+ - DETERMINE STATE FOR AREA CODE