Message buffer with improved escape sequence and automatic docum

Details Message buffer with improved escape sequence and automatic docum Message buffer with improved escape sequence and automatic docum

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.

REFERENCES:
patent: 3599177 (1971-08-01), Jen et al.
patent: 3828325 (1974-08-01), Stafford et al.
patent: 4156278 (1979-05-01), Wilhite
patent: 4156279 (1979-05-01), Wilhite
patent: 4159516 (1979-06-01), Henrion et al.
patent: 4210777 (1980-07-01), Bowerman et al.
patent: 4218754 (1980-08-01), Schaffer
patent: 4282583 (1981-08-01), Khan et al.
patent: 4282584 (1981-08-01), Brown et al.
patent: 4370730 (1983-01-01), Chadra
patent: 4371948 (1983-02-01), Chadra
patent: 4371950 (1983-02-01), Chadra
patent: 4381553 (1983-04-01), Ferguson
patent: 4387440 (1983-06-01), Eaton
patent: 4398246 (1983-08-01), Frediani et al.
patent: 4416558 (1983-11-01), McInroy et al.
patent: 4439829 (1984-03-01), Tsiang
patent: 4463417 (1984-07-01), Bushaw et al.
patent: 4549302 (1985-10-01), Heatherington
patent: 4628479 (1986-12-01), Borg et al.
patent: 4630198 (1986-12-01), I-Yuan
patent: 4641263 (1987-02-01), Perlman et al.
Oki Semiconductor Data Sheets for MSM4832 Clock/Calendar; pp. 1-6; Dec. 1983.
Zilog Z8530 SCC Data Sheets; pp. 839-860; Apr., 1985.
Rockwell R6522 Versatile Interface Adapter Data Sheets, pp. 1-22; Feb. 1984.

Affiliated with

Also associated with

Rating

Message buffer with improved escape sequence and automatic docum does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Message buffer with improved escape sequence and automatic docum, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Message buffer with improved escape sequence and automatic docum will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2363686