Abstract: A programmer unit which is connected to the keyboard of a machine is capable of storing, as a program, the sequential occurance of key closures, and of supplying simulated key closures through the keyboard to the machine in the order in which such key closures were initially generated and stored. The programmer enters that key closure information into a storage register. The programmer includes a main control circuit which is responsive to various inputs supplied thereto for also entering control information into the storage register. A register control circuit is responsive to instructions from the main control circuit for entering this information into the correct position within the storage register. When the stored program is accessed, the register control circuit is responsive to instructions from the main control circuit for transmitting key closure information from the storage register in the order in which such information was originally stored.