Boots – shoes – and leggings
Patent
1989-07-14
1991-05-28
Lall, Parshotam S.
Boots, shoes, and leggings
36442406, 364200, 340945, G06F 1520, G06F 1100
Patent
active
050199803
ABSTRACT:
A display monitor for monitoring data flowing on the avionics data buses of an aircraft includes an interface card (53) for interfacing a PC (51) to avionics buses (31, 33, 35, 37, 39) and a set of discrete input/output lines (63). The interface card (53) includes a series of ARINC receiver/transmitters (65, 67, 69, 71), a programmed CPU (55), a primary memory (59) and a dual port I/O memory (61). The ARINC receiver/transmitters provide communication paths to the avionics data buses and the dual port I/O memory (61) provides a communication path to the PC data bus (75). The interface card CPU (55) continuously scans the ARINC receiver/transmitters looking for avionics data and, at greater intervals, the discrete input lines (63) and the dual port I/O memory (61) looking for commands. ARINC data is initially "dumped" into the card primary memory (59) and later transferred to the dual port shared memory (61) from whence it is transferred to a work buffer in the PC. As it occurs, new data is written over old data. The high/low state of the discrete lines are used to control the setting of flags in the dual port shared memory (61). The PC (51) continuously scans the dual port shared memory (61) and the PC keyboard (52). In response to either discrete flags or PC keyboard commands, the PC shifts data in the work buffer to more permanent storage and/or prints selected data stored in the work buffer. The PC keyboard is also used to create commands that switch the monitor from a strictly monitoring mode of operation to an autotest/monitoring mode of operation. When in the autotest/monitoring mode of operation, key push buses are decoupled from avionics equipment and the PC is used to create commands similar to those produced by the decoupled key push sources. The data resulting from the commands is handled in the same way similar data is handled in the strictly monitoring mode of operation.
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Starr Benjamin F.
Talley Gaylen M.
Wallace Mark L.
Woo Paul M.
Lall Parshotam S.
The Boeing Company
Zanelli Michael
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