Patch Circuits for Read Only Storage
Original Publication Date: 1981-Mar-01
Included in the Prior Art Database: 2005-Feb-11
Incorrect data in the read-only storage (ROS) of a microprocessor system is patched by detecting the addresses of data blocks to be changed, inhibiting the normal ROS, and outputting modified data from another ROS. The address-detection circuits also specify multiple patch lengths and provide several options for increasing the address range of the patch capability.