Memory patching circuit
Memory patching circuit with increased capability
Memory patching circuit with repatching capability
Apparatus for accessing an information storage device having defective memory cells
Instruction altering system
Method for providing a substitute memory in a data processing system
Device for automatic modification of ROM contents by a system selected variable
Memory cartridge for video game system
Memory system with flexible replacement units
Cartridge adapter for programmable video games
ApplicationNo. 530617 filed on 05/30/1990
US Classes:463/45, Cartridge adaptor711/115, Detachable memory711/167Access timing
ExaminersPrimary: Grieb, William H.
Assistant: Harris, Erica B.
Attorney, Agent or Firm
International ClassA63F 009/22
Foreign Application Priority Data1989-06-05 GB
AbstractAn interfacing device for connecting the processing unit of a computer games system to an external data storage medium has a user-operable selection unit for generating a user-selected address and user-selected data. The user-operable selection unit may comprise user-operable switches or electronic latches that are set by a program in response to selections made by the user by means of a joystick, keypad or any other input device. An address comparison unit compares the user-selected address with the addresses from the processing unit, and a data switching device causes the user-selected data to be substituted for data in the storage medium whenever the compared addresses are the same. Instead of a user-operable selection unit, preselected addresses and preselected data may be stored in a ROM, which in one embodiment changes the way the computer interprets external memory and in another changes the computer's internal memory itself.
Field of SearchAll video game accessories