Boots – shoes – and leggings
Patent
1991-06-19
1992-09-08
Lee, Thomas C.
Boots, shoes, and leggings
3642419, 3642842, 364DIG1, 36492795, 364DIG2, 34082503, 395800, G06F 1320, G06F 1300
Patent
active
051465655
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.
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Agarwal Rakesh K.
Blanck Greg J.
Harrity Paul
Intel Corporation
Lee Thomas C.
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