Abstract: This device is an add-on accessory for existing personal computer systems. This device is a user definable, keyboard MACRO storage device which operates independently of the hardware and software installed in the computer, plugs into the keyboard line of the computer and stores a plurality of different keyboard MACROs, that is, keyboard keystroke sequences. internally, the device contains a dedicated microprocessor which monitors and controls all operations. It stores the MACROs, selected by the user, in its non-volatile memory and associates them with user-defined commands. The commands are then subsequently executed via the device's keypad. The invention may be installed permanently in the keyboard line without taking any precautions to save the MACROs when the computer is powered down or, in the alternative, when the device is removed from the keyboard line. The device performs detailed internal self checks in order to insure its correct operation.