I/O Control system having a plurality of access enabling bits for controlling access to selective ports of an I/O device
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Sep 8, 1992
Issued Date -
N/A
app pub date -
Jun 19, 1991
filing date -
Jul 18, 1986
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
In an I/O port protection device, accessing an I/O device is selectively controlled by a value of a bit stored in a bit map. A CPU instruction accessing a port is allowed direct acceess when the bit value for that port is a zero, but is trapped when the value is a one. A trapped instruction is either prohibited from any accessing or is rerouted for accessing a different I/O port.
First Claim
Family
International Classification(s)
Cited Art Landscape
Patent Citation Ranking
Advertisement
Advertisement
Advertisement
Recipient Email Address
Recipient Email Address
Comment
Recipient Email Address
Add to Portfolio(s)
To add this patent to one, or more, of your portfolios, simply click the add button.
This Patent is in these Portfolios:
Add to additional portfolios:
Last Refreshed On:
Changes done successfully