CS225702B1 - Equipment for alphanumeric display character selection, especially logic analyzers - Google Patents

Abstract

The invention solves a device that allows optical selection of a selected character from a displayed alphanumeric, numeric or symbolic text, its subsequent memorization and possible change. The solution is achieved by feedback connection of the output of the q-word main memory, in which the displayed data is stored, with the input of this memory via a multiplexer switching the displayed characters, via a controlled decoder for changing the character, via a single-word shift buffer, via power circuits and via wires of a bidirectional internal bus. A light pen is used as a character identifier on the display, which the operator directs to the selected character and makes a possible change with a button.

Description

(54) Device for selecting a character on an alphanumeric display), in particular logic analyzers

The invention provides a device which allows the selected character to be optically selected from the displayed alphanumeric, numeric or symbolic text, its subsequent memorization and eventual change.

The solution is achieved by combining the output of the q-word main memory in which the displayed data is stored with input of the memory through a multiplexer switching display characters, a controlled character change decoder, a one-word sliding buffer, power circuits and bi-directional internal wires bus. A light pen is used as the identifier of the character on the display, which the operator points to the selected character and makes a possible change with the button.

225 702

The invention relates to a device for selecting a character on an alphanumeric display, in particular logic analyzers equipped with a q-word main memory in which the displayed and event are stored, as well as other data which enables precise optical selection of the selected character from the displayed alphanumeric, numerical or symbolic text , its subsequent remembering and eventual change.

Existing alphanumeric displays work when handling individual characters, either by simply addressing the selected character from the keyboard, or with the so-called cursors-controlled markers again, by means of which the address data is searched semi-automatically.

In both cases, the operator of a device with such a display must work with the keyboard and use the most complex human perception, visual perception, only to check the correct handling of the keyboard, which is lengthy because it does not take full advantage of human hand agility and perfect coordination using sight.

This disadvantage is overcome by the device for selecting the character on the alphanumetric display of the logic analyzers according to the invention, which consists in that the outputs of the q-word main memory are connected to the signal inputs of a multiplexer whose g outputs are connected to the signal inputs of the p-input controlled decoder. a character change whose control inputs are connected to the outputs of the desired character change circuit, which circuit is connected to the output of the character selection coincidence circuit by its control input, the signal outputs of the p-input control of the character change decoder are connected to corresponding wires of the , wherein the n conductors forming its parallel output are reconnected to the q-word main memory inputs via a plurality of output power gates, an internal bus signal conductor, and a plurality of sampling gates.

An advantage of the device according to the invention is that an optoelectric sensor of a so-called light pen can be used as an identifier of a selected character on an alphanumeric display on which a specified portion of the q-word main memory of the device, eg a logic analyzer, is displayed. The selected feature is that the light pen tube is pointed at the selected feature on the display, which lights up with increased brightness to control and orient the operator correctly. This brightness can be advantageously used to generate a positive feedback signal from the optoelectric sensor and to reduce the level of faults.

BRIEF DESCRIPTION OF THE DRAWINGS The invention is described in more detail with reference to the accompanying drawings, in which: Figure 1 is a block diagram of a device according to the invention; Figure 2a shows an exemplary mechanical arrangement of an identifier, a light pen;

Fig. 1 shows a block diagram of a device according to the invention, wherein a bi-directional internal bus 01 formed by n signal conductors 001. 002. ... On. between which there is at least one synchronization conductor OOs, is essentially intended for single-conductor connection to a device superordinated to the q-word main memory 11, and from this bus data are received through a group of 10 sampling gateways with signal inputs 101, 102, ... 10n. to which signal wires 001 are connected. 002. ... 00η. to signal inputs 111, 112. ... 11 n q-word main memory 1 1. The outputs of the q-word main memory 11 are coupled to the signal inputs 161, 162. ... 16n of the multiplexer 16, in which the n input wires are sequentially switched to a group of wires belonging to the individual characters appearing simultaneously on the display; These wires are connected to the signal inputs 181. 182. ... 18p of the p-input controlled decoder 18 for changing the symbol. Only the outputs of this decoder 18 are connected to the individual inputs 051, 052. ... 05p of the parallel-parallel input (if p = 1, then purely serial) of a one-bit buffer of 5 bits, i.e. for the entire width of the word transmitted over the internal bus 01 and stored in q-word main memory 1 1. The outputs of the one-word buffer 15 are connected in parallel to the signal inputs 201, 202.

... 20n groups of 20 output power gates whose three-state outputs are connected to the corresponding wires 001. 002. ... OOn bidirectional internal bus.01. Address inputs 011. 002, ... The q-word main memories 11 are connected to the output of the address counter switch 12 having two inputs, the first of which is the output of the address counter 13 for recording, the second of the address counter 14 for reading. The input circuits from the control elements intended for presetting the address counters 13 for recording and the synchronization wire OOs from the internal bus 01 are connected first to the control circuits 31.

A further single-wire output of the control circuit 31 is coupled to a common input 100 of the sampling gate group 10, and likewise another output of the control circuit 12 is coupled to a common control input 20. a group of 20 output power gates.

The control inputs 061. 062. ... 06m of the multiplexer 16 are connected to the m-wire output of the character counter 21, which is controlled by a free-running precision, e.g., crystal, oscillator 21, whose m-wire output is further connected to the inputs 221 . 222 ... 22m of the character position generator 22 that forms the horizontal and vertical components 22x. 22 in the symbol position, further to the signal inputs 281, 282. ... 28m of the symbol selection gate group 28 and to the signal inputs 311. 312, ... the coincidence circuit 30 of the character selection.

The wire multiplexer output 16 is also connected to inputs 191. 192. The character generator 19p which forms the horizontal and vertical component 19x and 19 in the character shape. These components are combined with the character position components 22x and 22v in the summing amplifiers 24 and 25, and the resulting horizontal component 24x and the vertical component 25v are connected to the horizontal input x and the vertical input χ of the display 27.

At the common control input 280 of the character selection gateway alipine 28, the output of the character identifier 11, indicated as a light pen, in the circuit block diagram shown in FIG. The outputs of the individual gates of group 28 are connected to the individual conductors 291, 292. ... 29m of the parallel m-wire input of the one-word memory 29 of the selected character. The outputs belonging to the individual bits of the m-bit word stored in the selected character memory 29 are associated with the corresponding inputs 301. 302. ... 30m coincidence circuit JO. character selection.

A single output wire of this circuit is coupled to the input brightness input Z of the display 27, and is additionally connected to the input 350 of the desired feature change circuit 35 provided with the control elements 351. The outputs of the desired symbol change circuit 35 are connected to the control inputs 081, 082, ... 08r of the p-input controlled decoder 18 for changing the symbol.

Fig. 2 shows an exemplary embodiment of a character identifier 36, designed optoelectronically as a light pen.

Fig. 2a shows an example of the mechanical arrangement of the light pen. Its components are located in the tube 360, in the front part (left in Fig. 2a), in which the lens 38 is located. The lens 38 has a phototransistor 37 micro-objective, for example a phototransistor type KP 101, whose terminals are connected to the input electronics, located at the back of the tube. In addition, there is a character selection button 70 and a button 311 in the tube, whereby the operator makes a possible change to the selected character.

Fig. 2b shows an example of the wiring of electronic circuits located in the light pen tube 360. Phototransistor 37 is connected by its emitter based on transistor T1 and by its collector to the collector of transistor T1 and base of transistor T2 of preamplifier 39. where transistor T2 together with capacitor C41 connected to its emitter and further resistor R41 connected to sum input 43 of operational amplifier 40 circuit. The output of the operational amplifier 40 is coupled to the summation input 53 of the comparator 10, whose difference of input 2252 is connected to an adjustable divider consisting of a pair of fixed resistors R51 and R52 and an adjustable resistor R53. which is connected to the power supply and which can be used to adjust the comparator decision level with respect to the phototransistor ϋ, display brightness 27 and event. disturbing signals from the surroundings. The output 56 of the comparator 50 is connected to the gate input 60, the second input of which is connected to the character selection button 70. Only an operator-approved pulse selection pulse is fed from the gate output 60 to a common control input 280 of the symbol selection gate group 28.

The described system is applicable to screen displays with a so-called vector-based character creation method, as well as to semiconductor displays in which all individual characters are created at once and display the geometric size of these displays in succession regardless of the range e.

Claims (3)

SUBJECT OF THE INVENTION 1. Device for selecting a character on an alphanumeric display, in particular logic analyzers, equipped with a q-word main memory in which the displayed and eventually stored data are stored. Other data, characterized in that the outputs of the q-word main memory (11) are connected to the signal inputs (161, 162, ... 16n) of the multiplexer (16), the outputs of which are connected to the signal inputs (181-, 182) , ... 18p) of a p-input controlled character change decoder (18) whose control inputs (081, 082, ... 08r) are connected to the outputs of the desired character change circuit (35), the circuit (35) being by its control input (350) connected to the output of the character selection coincidence circuit (30), the signal outputs of the β-input controlled character decoder (18) are connected to the corresponding wires (050, 051, ... 05p) of the serial parallel input of a single word buffer (15), wherein the n conductors forming its parallel output are via a plurality (20) of the output power gates (201, 202, ... 20n), via the signal conductors (001, 002, ... 00η) of the internal bus (01) and through the group (10) of the sampling gates (101, 102, ... 10n) connected back to the inputs (111, 112, ... lin) of the q-word main memory (11). Device according to claim 1, characterized in that one m-tuple of inputs (311, 312, ... 31m) of the character selection coincidence circuit (30) is directly connected to the outputs of the character counter (21), while its other m- the three inputs are connected to the outputs of the selected character memory (29), whose inputs (29 ', 292, ... 29m) are connected to the outputs of the individual gates of the character selection gate group (28) whose individual signal inputs (281, 282,. (28m) are connected (281, 282, ... 28m) to the individual outputs of the character counter (21) and whose common control input (280) is connected to the output wire of the selected character identifier (36). 3. The device of claim 2, wherein the selected character identifier is a light pen, wherein the emitter of the phototransistor (37) lying in the focus of the objective (38) of the selected character identifier (36) is connected to the transistor base (TI) and collector. the phototransistor (37) is connected to the collector of the transistor (71) and the base of the transistor (T2), both transistors together with their load resistors form a preamplifier (39) which together with a capacitor (C41) connected between the emitter of transistor (T2) and the summation input (43) of the operational amplifier (40) and the resistor (R41) on the other side form a derivative circuit, the output (46) of the operational amplifier (40) being coupled to the summation input (53) of the comparator (50). 52) is connected to an adjustable divider consisting of two fixed resistors (R51, R52) and one adjustable resistor (R53), which is connected to a power supply, the output (56) the comparator (50) is connected to the gate input signal (60), the control input of which is connected to the character selection button (70) and whose output is connected to the common control input (280) of the character selection gate group (28). 2 drawings 0O1, OO2 _r ..0Qn