Rom replacement using dual-mapped ram
CA 1295747 C · Owner: Culley, Paul R. · Inventors: Culley, Paul R.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A personal computer is disclosed which has the capability of transferring the contents of the computer's 16-bit read only memory (ROM) into the computer's 32-bit random access memory (RAM) by mapping the ROM contents in the same memory locations in RAM. The use of the dual mapped ROM obviates the poor performance which was previously obtained by the use of an 8-bit or 16-bit ROM with a 32-bit microprocessor. The use of the dual mapped ROM permits the 32-bit microprocessor to make calls to the basic input/output system (BIOS) at the rate of 32-bits instead of an 8-bit or 16-bit rate. A logic means is provided to test as much RAM as is necessary to store the BIOS. Thereafter the BIOS is …
Read the whole patent
Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Granted February 11, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended February 11, 2009.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.