Programmable Storage Card Select Shifter
Original Publication Date: 1987-Jan-01
Included in the Prior Art Database: 2005-Jan-31
A system which uses hard wired storage cards, which are selected by control logic, could not function if the first card was inoperable and its memory space was required for vital data to initial program load the system. The installation of an additional register, which holds the value of the number of positions to rotate the card select lines, allows the system to function in the event of a card failure. The register is scannable so that it can be changed at any time that a card is determined to be defective.