Abstract: An apparatus adapted to be coupled between a keyboard and a computer to enable a user to define desired keys as coded keys which are associated with MACROS defined by the user. The apparatus includes a microcontroller and an electrically erasable, programmable read only memory (EEPROM) which monitors codes transmitted from the keyboard and is placed in a programming mode when a predetermined program code is received from the keyboard. Once in the program mode, the next key depressed by the user is denoted as a coded key and the following keys depressed by the user are designated as a user programmed MACRO associated with the coded key. The apparatus stores this information in the EEPROM and thereafter when the coded key is depressed by the user the associated MACRO is generated and transmitted to the computer. The apparatus forms a very compact, relatively inexpensive means for enabling conventional keyboards to function as programmable keyboards.