Method of sharing an I/O device between a host operating system and a foreign operating system in a single computer
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United States of America Patent
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Feb 26, 2002
Grant Date -
N/A
app pub date -
Mar 19, 1999
filing date -
Mar 19, 1999
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Abstract
An I/O device is shared between a host operating system, and a foreign operating system that runs under the host operating system, in a single computer. The I/O device must be of a type which includes a port driver that receives device commands for reading addressable fields on a removable data storage media. Each media which is to be a source of data for the host operating system stores a first identifier in a particular addressable field, and each media which is to be a source of data for the foreign operating system stores a second identifier in a particular addressable field. A registry in the host operating system indicates that the I/O device is to be used exclusively by the host operating system; so the host will try to use the I/O device. But in addition, a different private registry in the foreign operating system indicates how that operating system can address the I/O device; so the foreign operating systems will also try to use the I/O device. Each time the host operating system attempts to use the I/O device, it looks for the first identifier on the storage media; and it terminates its attempt if the first identifier is not found. Each time the foreign operating system attempts to use the I/O device, it looks for the second identifier on the storage media; and it terminates its attempt if the second identifier is not found.
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- 15 United States
- 10 France
- 8 Japan
- 7 China
- 5 Korea
- 2 Other
Patent Owner(s)
- UNISYS CORPORATION
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Inventor(s)
Inventor Name | Address | # of filed Patents | Total Citations |
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Eaves, David Reid | Mission Viejo, CA | 1 | 8 |
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Fee | Large entity fee | small entity fee | micro entity fee |
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Surcharge after expiration - Late payment is unavoidable | $700.00 | $350.00 | $175.00 |
Surcharge after expiration - Late payment is unintentional | $1,640.00 | $820.00 | $410.00 |
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