first circuit means thereby to establish a series of said FIG. 6 illustrates in schematic block diagram form a
special bits in the set of storage locations. logic unit employed in the data transmission and dis
The display apparatus of the invention further in- play system of the invention for achieving particular
eludes a display means coupled to the output of the first display attributes for data characters; and
circuit means. This display means has a character dis- 5 FIG. 7 illustrates a typical example of the manner in
play area defined by a plurality of display lines equal in which attribute data specifying particular display attri
number to the number of display data signals in a set hutcs for data characters is processed in storage buffers
of display data signals. A fourth circuit means associ- employed in the data transmission and display system
ated with the display means operates to produce a sig- °f the invention.
nal corresponding to a predetermined one of the dis- l« DETAILED DESCRIPTION OF THE INVENTION play lines of the display means.
A fifth circuit means coupled to the data source
means operates to receive and store therein, for the General Description predetermined number of times that the set of data is
produced by the data source means, the line data of the 15 Referring now to FIGS. 1(a) and Kb), there is shown
attribute character. A sixth circuit means coupled to a data transmission and display system 1 in accordance
the first, fourth and fifth circuit means operates in re- with the present invention. The data transmission and
sponse to the storage in the fifth circuit means of the dlsP,ay system 1 '"dudes a processor 2 which is ar
line data of the attribute character and in response to ranSed to suPP]y senal coded contro1 and d,sP,ay data
a signal produced by the fourth circuit means cor're- 20 to a data storaSe and Processing unit 3 to be stored
spending to the predetermined one of the display lines thtTem and Passed into a foam for the subsequent
of the display means to prevent the first circuit means control of one or more of a plurality of input/output de
from receiving a display data signal from the display v,ces employed in the system and also for the d.splay
signal generator means and, instead, to enable the first „ of selected portions of the serial data on a CRT video
circuit means to be clocked by the third circuit means 25 ... TMnit°r 5 lFIG' ^ The "PUtloutW dc
, , ... f , . .. . ,,■ . , vices used in the system which may be contro ed by
thereby to permit the series ot special bits established , , 1 „ 1 . . ,, \
, C .\L e- . ■ data from, the processor 2 are shown in FIG. 1 (b) and
in the set of storage locations ot trie first circuit means , , ,■ r „ , , ., .. .
. , , , , . f, . , rr . include, by way of example, a keyboard 6, a light pen
to be clocked to the output ot the tirst circuit means, _ , , j „ . ■ „
.. . . „ . , . , . . . ... 7, a badge reader 8, and a copy printer 9.
this series of special bits thereby replacing a display -m • , . . .
, , j , , ,. , . , To process the serial data produced by the processor
data signal produced bv the displav signal generating - . . , ...... ,, ,. , . , . .
6 v - v . b b 6 2, the serial data is initially applied to the data storage
means. , . .. , , . . • ..
,. , . and processing unit 3 and stored in a storage unit pro
The display means operates to receive the bits ot • , , . , , . r„
, , ,. , , . , , , , . r , vided therein (e.g., a random access memory). Se
each of the disp ay data signa s and the bits of the series , . , f ■ , . .. , , f
"■ , , , , r , <- ■ ■ lected portions of this data are then read out from the
of specal bits clocked to the output of the first circuit 35 aforementioned storage unit and, at periodic fixed in
means. The display means operates ,n response to the ... ... frame anrf ,jne hronization charac.
bits of each of the d.splay data signals to produce in the ^ afe ... jnt0 the seHa, data tQ ... a syn_
character display area thereof a porHon of an image of chronous data format. This data format is neCessary to
the corresponding data character during a correspond- achieve proper synchronization and timing between the
ing one of the d.splay lines. The display means further 40 serja, data and ,he rest Qf the system Jhe synchronous
operates in response to the series of special bits to pro- seria, data is then appiied to a coaxial cab,e transmis.
duce in the character display area therof an image of sion ,ine 12 and transmitted to other parts of the system
a line during the aforesaid predetermined one of the to be further processed thereby for ultimate control of
display lines. The composite image is therefore that of tne inpUt/output devices 6-9 and the CRT video dis
the data character with a line associated therewith. 45 monitor 5.
BRIEF DESCRIPTION OF THE DRAWING As wi" be described in detail hereinafter, other data,
of an asynchronous nature and capable of being proVarious objects, features and advantages of a data duced by one or more of the input/output devices 6-9, transmission and display system in accordance with the may ajso pass through the coaxial cable transmission present invention will be apparent from the following 50 ijne 12, in the opposite direction, and be applied to the detailed discussion taken in conjunction with the ac- data storage and processing unit 3. This data is then apcompanying drawing in which: plied back to the processor 2 for processing thereby in FIGS. 1(a) and 1(b), when arranged as shown in FIG. any suitable or desired manner. It is apparent, there2, illustrate in schematic block diagram for a data fore, that transmission of data over the coaxial cable transmission and display system in accordance with the transmission line 12 can take place in two directions, invention; in a first direction between the data storage and proFIGS. 3( a) - 3( k) illustrate the nature and formatting cessing unit 3 and the input/ output devices 6-9 and the of serial data employed in the data transmission and CRT video display monitor 5 and in a second direction display system of the invention; ^ between the input/output devices 6-9 and the data FIG. 4 illustrates the general manner in which data storage and processing unit 3. A typical length for the characters are displayed on a video display monitor coaxial cable transmission line 12 is 2000 feet, employed in the data transmission and display system The abovementioned data storage and processing of the invention; unit 3 may be implemented by apparatus known to FIGS. 5(a) - 5(g) illustrates cursor images and typi- ^ those skilled in the art. However, a particularly suitable cal images of data characters as caused to be displayed "and preferred implementation of the data storage and on the video display monitor and having predetermined processing unit 3 is described in detail and claimed in display attributes; co-pending patent application of Joseph L. O'Neill,