SU1587484A1 - Device for output of symbol information on screen of cathode-ray tube - Google Patents

Abstract

The invention relates to automation and computing and can be used to display information from a computer. The purpose of the invention is to expand the field of application of the device by changing the format of the displayed information. For this, a device 5 is inserted into the device with corresponding functional connections. The invention allows the display of information in a format of 25 lines of 80 characters, which is most common when displaying information from a computer. 1 il.

Description

The invention relates to automation and computing and can be used to display information from a computer.

The purpose of the invention is to expand the field of application of the device by changing the format of the displayed information.

The drawing shows a block diagram of the device.

The device contains a generator of 1 clock pulses, the first counter 2, block 3 of the operational parameter. character generator4, second counter 5, decoder 6, block 7 synchronization. The character generator 4 contains a block of 8 permanent memory and the register 9 shift. The memory unit 3 comprises a bi-directional bus driver 10 and a memory unit 11. The synchronization unit 7 contains a counter 12, a decoder 13, a counter 14. one-oscillators 15 and 16. The first counter 2 contains reversible counters 17-19.

In addition, there are designated the device readiness signal output 20, the read control inputs 21 and the device write 22, the device information inputs-outputs 23, the device address inputs 24 and 25 (inputs for connecting to the microcomputer address bus), frame personnel 26 and line outputs 27 sync pulses, information output (video output) 28 devices.

The device works as follows.

The device generates a full television signal and provides the formation of alphanumeric m pseudographic characters, with each acquaintance displayed by a matrix of 8x8 pixels of a television raster without intermediate blackouts. The device allows you to display 25 lines of 80 characters each, which corresponds to the received standard. In device uses

but

C) i npiiiiunn of the continuous readout n display coAep-v.i iMoro of the block 3 JUT screen e-beam tube (CRT.

Homerator 1 Pyrbztypot 1 mpulsy with nepiiOAor-i, different premeni zavotkp oAfiOii. points (frequency of trace impulses; b) ,. which receive lia clock input of the parii-country 9 of the Zyakogbnegoro A and the counting input of the counter 14, EXPLOSIVE on the mic) osxme. From the output P of this counter, the pulses, continuously following 1 out with a frequency (1 / 6-1), come to the clock input of the counter 12. Dechy () 13 analyzes the state of the counter 12 and generates line sync pulses of the decrementing pulse 2 of the counter.

Constant memory block 8 of character generator A carries out a symbol code reamer, riocTynasouiero to its address inputs from memory 11 of memory, into a character matrix by sequentially addressing character matrix rows with signals from counter 5 outputs. Shift register 9 of character generator 4 converts a parallel The format of a row of a matrix of the character is sequential. When the counter reaches 12, code 10 (80 familiarity is displayed), the lower-case quenching pulse begins. The decoder 13 at the DO output generates a pulse, the input of the T input of the counter 14 and the synchronization of the counter 2 and the register 9 with pulses (1/8). The clock from the output of the Y. A continuous blanking pulse corresponds to 48 displayed characters. During this time, the contents of counter 2 are decremented by 80 pulses received by them to input -1 of counter 18 from the output DA of the decoder 13. This is necessary for re-displaying 80 bytes of memory block 11 (80 characters) in the next line of the TV raster. Transition to a new line of familiarity is done without decrementing the count |, 1k 2. Thus, a line is unfolded sequentially from 80 familiarity consisting of 8 television lines.

After displaying the last line of the last familiarity, a frame damping pulse starts on the screen. At output 2 of counter 19, a logical unit signal appears, triggering the one-shot 15 and 16, arriving at input A of the decoder 6. 1.1 and A8 input decoder 13. At the time. the action of a frame damping pulse, the decoder 13 at the output of the GZO generates an impulse prohibiting the tactirometer count 2 and register 9 of the character generator 4. The impulse from the output of the single vibrator 15 permits the decoder 13 to be reset.

counter 2, prepare the circuit for displaying the next frame.

. B. About the frame damping pulse, counter 2 is not clocked and access to block 11 of memory from the microcomputer is allowed. The address from address bus 24 receives tta information inputs of counter 2 on the access signal from output DO of the decoder 6. Data on bus 23. through bidirectional 0 (the driver of the shaper 10 is received (or selected) via inputs-outputs DO ... 07 of memory block 11. Data transfer direction is determined by the signal from output D1 of the decoder 6. The structure of the decoder 6 6 is such that the signal at the DO output is if, at their old bits, there is a bus 25 address of signals determining the region of the memory block 11 in the address space of the micro-computer, the inputs 21 or 22 of the device have 0 signal read or write gates and tna input A7 of the pulse decoder from output 2 of the counter 19 ; signal at the output of D1 - only during the write cycle time in memory block 11; the output signal 02 during the regeneration of the image 5 on the CRT screen. the forward stroke period, a signal appears on you, .- ,;: JTOB of the device, which delays the operation of the microcomputer before the occurrence of a personnel damping pulse.

Thus, the pre / lag device allows, in comparison with the known, to organize the display of information in the form of 25 lines of 80 characters each, without increasing hardware costs. This format is the most common in display devices.

from a computer. ..

A f o rumula and 3 o n the Device for outputting symbolic information to the screen of an cathode ray tube 45 containing a memory unit, character generator, first counter, synchronization unit, decoder, clock generator, the output of which is connected to the clock inputs of the synchronization unit and the character generator, the control input of which is connected to the first output of the synchronization unit connected to the direct input of the first counter, the output of the group of which is connected to the address 55 inputs of the operational memory block, The outputs of which are connected to the address inputs of the first, character generator group, the output of which is the information output of the device, the first control input of the RAM block is connected to the first output of the decoder connected to the control "stroke of the first counter whose output is connected to the control input of the block synchronization and to the first information input of the decoder, the second output of which is connected to the second control input of the RAM, the information inputs-outputs of which are information i Inputs / outputs-devices, the second output of the synchronization unit is connected to the input of the first counter, whose information inputs are the address inputs of the first group of the device, the second and third information inputs of the decoder are the read and write control inputs respectively, the information inputs of the decoder group

are the address inputs of the second device group, the third output of the decoder is the output of the device ready signal, the third and fourth outputs of the block

synchronization outputs of the lowercase and frame sync pulses of the device, respectively, characterized in that, in order to expand the area of application of the device by changing the format of the displayed information, it contains a second counter, the outputs of which are connected to the address inputs of the second group of the character generator, and to the address inputs of the synchronization unit, the fifth output of which is connected to the clock input of the second counter; the sixth output of the synchronization unit is connected to the counting input of the first counter.

Claims (1)

Claim A device for outputting symbolic information to the screen of a cathode ray tube containing a random access memory block, a character generator, a first counter, a synchronization unit, a decoder, a clock generator, the output of which is connected to the clock inputs of a synchronization unit and a character generator, the control input of which is connected to the first output of the unit synchronization connected to the direct account input of the first counter, the group outputs of which are connected to the address inputs of the RAM block, the outputs of which are connected to the address the inputs of the first group of the character generator, the output of which is the information output of the device, the first control input of the RAM unit is connected to the first output of the decoder connected to the control input of the first counter, the output of which is connected to the control input of the synchronization unit and to the first information input of the decoder, the second output which is connected to the second control input of the random access memory block, the information inputs and outputs of which are information inputs and outputs. The output of the synchronization unit is connected to the input U. About the first counter, the information inputs of which are the address inputs of the first group of the device, the second and third information inputs of the decoder are the inputs for controlling the reading and writing of the device, respectively, the information inputs of the decoder group are address inputs. The second group of the device , the third output of the decoder is the output of the device ready signal, the third and fourth outputs of the synchronization unit 5 are the outputs of the horizontal and frame sync device pulses, respectively, characterized in that, in order to expand the scope of the device by changing the format of the displayed information, it contains a second counter, the outputs of which are connected to the address inputs of the second group of the character generator and to the address inputs of the synchronization unit, the fifth output of which is connected to clock input of the second counter, the sixth output of the synchronization unit is connected to the input of the countdown of the first counter. f E I i I Was IUA 8 W fLVJXiSffWni h 2 ° 2 '2 ^g 2 ³ 17 ? Fmgxrn USA 5. SHA6SHA7 * . eleven --- ** whether - A! by -.A? * D1 -AZ 52 - M thirteen D3 -45 m -A6 ' -A7 - M) -AZ -