Boots – shoes – and leggings
Patent
1976-03-12
1979-12-04
Chapnick, Melvin B.
Boots, shoes, and leggings
G06F 304, G06F 1300
Patent
active
041775120
ABSTRACT:
A system for automatically polling peripherals associated with a computer system employing a program controlled interrupt mechanism wherein a number of programmatically established descriptors control input/output operations. Two such descriptors, one dictating a read-from-peripheral operation and the other a write-to-peripheral operation, are linked in a loop such that under typical polling conditions the input/output control unit controls read-write accesses to the computer system memory independent of the computer central processor. Loop operation is accomplished by a linking address in each descriptor which is set to point to the other descriptor and by op code bits set to indicate a poll mode such that the I/O control typically performs a read-write-read-write sequence of operations. A poll message list is stored at a memory location indicated by the write descriptor, and the I/O control maintains the proper address in the poll message list to be accessed during each successive performance of the write operation. To assist in automatic linking between descriptors, the I/O control sets an "operation complete" condition, relieving the computer processor of this task.
REFERENCES:
patent: 3487375 (1969-12-01), Macon et al.
patent: 3559187 (1971-01-01), Figueroa et al.
patent: 3728682 (1973-04-01), Helbig, Sr.
patent: 3728693 (1973-04-01), Macker et al.
patent: 3913074 (1975-10-01), Homberg et al.
patent: 3919483 (1975-11-01), Gindi et al.
Burroughs Corporation
Cass Nathan
Chapnick Melvin B.
Feeney, Jr. Edward J.
Peterson Kevin R.
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