Boots – shoes – and leggings
Patent
1988-09-09
1989-07-25
Eng, David Y.
Boots, shoes, and leggings
3649261, 3649269, 36492693, 364939, 3649392, 3649393, 3649394, 3649396, 364950, 3649504, G06F 1300, G06F 1310, G06F 1312, G06F 1338
Patent
active
048520454
ABSTRACT:
An improved message buffer for transferring data between two or more digital data devices is disclosed. A dual universal asynchronous receiver-transmitter (13) provides bidirectional data flow to two bidirectional ports (B and C) through two interface circuits (14 and 15). A peripheral interface adapter (16) and a third interface circuit (17) provide for sending data to an output port (A) in a serial or a parallel data format, and provides access to a real time clock (20), an electrically erasable programmable read only memory (41), a bank of switches (36), and a bank of display indicators (37). A read only memory (11) provides operating instructions to a control unit (10). The control unit (10) reads data and handshake signals from the two bidirectional ports (B and C), stores the data in a random access memory (12), reads the data from the memory (12) and sends it to the output port (A). The control unit (10) is responsive to a predetermined period of no data from the bidirectional ports (B and C) for automatically marking the beginning and end of a document. The control unit (10) is also responsive to a minimum and a maximum period of a break signal followed by a first predetermined character at a predetermined set of data format parameters for escaping from an on-line mode of operation to a command mode.
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Cox Stuart A.
Kraul Douglas R.
Eng David Y.
Harrell Robert B.
Hayes Microcomputer Products, Inc.
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