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US 4,400,798 AGranted
Memory patching system
AssigneeTektronix, Inc.
InventorsRobert S. Francis, Bruce C. Stofer
Life of this patent
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Abstract
A memory patching system which transfers permanent-type information in a read-only memory (ROM) to a random access memory (RAM) and modifying contents of the RAM in accordance with patch information in an eraseable programmable ROM is disclosed.
Claims9
A memory patching system, comprising;
- a first memory containing permanent type information;
- a second memory containing patch information;
- a third memory;
- and
- control means for transferring contents of said first memory to said third memory, and modifying contents of said third memory in accordance with contents of said second memory.
2 more elements
A memory patching system, comprising;
- an unalterable read-only memory storing permanent type information;
- an eraseable programmable read-only memory;
- a random access memory;
- and
- control means for storing patch information in said eraseable programmable read only memory, transferring said permanent-type information stored in said unalterable read only memory to said random access memory, and
- modifying said transferred information in said random access memory in accordance with said patch information in said eraseable programmable read-only memory.
3 more elements
Dependencies are inferred from the claim text.