SU760079A1 - Symbol generator - Google Patents

Description

The invention relates to the field of computing technology and is intended for the generation of characters in display devices.

It is known to sign a device containing an input register, a decoder, amplifiers, a ferrite matrix, a shift register, a driver, a clock generator, triggers, code converters [1].

The disadvantage of this sign generator is complexity.

The closest technical solution to the invention is a character generator containing serially connected the first counter and the first memory block, the first output of which is connected to the generator output, the second output - to the first input of the control unit, the first output of which is connected to the first input of the first counter [2].

The disadvantage of this sign generator is complexity.

The purpose of the invention is the simplification of the character generator.

This goal is achieved by the fact that

character generator contains sequentially

2

connected to a register and the second storage unit, decoder, and a second counter, a first input of which is connected to the second output of the first block pamyadi, the second input - to the second output of the control unit, the output - to the WTO ₅ rum input of the first counter, a third input coupled to an output of the second block memory, the third output of the first memory block is connected to the input of the decoder, the outputs of which are the outputs of the character generator, the register input is connected to the third

th output control unit.

FIG. 1 is a block diagram of a character generator; in fig. .2 is one of the generated characters.

The character generator contains a register 1, the second memory block 2, the first counter 3, the first memory block 4, the decoder 5, the second counter 6, the control block 7.

The device works as follows.

FIG. 2 shows the direction of walking around the sign A, the solid line with the arrow indicates the needle movement in the lowered state, the dashed line - in the raised position. To move the needle one elementary step, two coordinates X (—X) and У (—Υ) and needle position are set: omitted (£. = 1) or

760079 raised (Ζ = 0). The value, for example, X - = 1 and Υ = 1 determines the movement of the needle at an angle of 45 °. Similarly, the motion at an angle of 135, 225, or 315 ^e can be specified ^{. The} unit value of one of the coordinates specifies the motion of the needle at an angle of 0, 90, 180, and 270 °.

The word (byte), defining the movement of the needle, consists of three digits (1-3) of the displacement coordinates X and Υ; single digit (4) needle positions (Ζ); three discharges (5-7) of the number of elementary steps of this type; one digit (8) sign of the end of the sign.

A byte determines the movement of the needle several steps in one direction, and the sign can be written in several bytes (for example, the sign A - the family).

To draw the desired character, the character generator should be addressed with a character code. The sign code is fed to the input of register 1, and the sync signal of the sign tracking goes to control unit 7. According to the sign code from the second memory block 2, the code for the intermediate address is selected for counter 3. At this address, the output of the counter 3 is followed by a call to the memory block 4, and the first byte of the character formation from the last output goes to the input of the decoder 5 and then to the output of the character generator (coordinates X and Y). The coordinate Ζ comes directly from the output of memory block 4 to the output of the character generator. The control unit 7 generates a first sync pulse identifying the signals at the output of the character generator (first step). The number of elementary steps, recorded in the second counter 6, is reduced by "1". If it is not zero, then the control unit 7 generates the next sync pulse arriving at the output of the character generator, the contents of counter 6 are again reduced by one, etc. This process repeats until the counter

steps will not be reset. When counter 6 is reset, counter 3 receives a counting signal at (4-1), selects the next byte from the first memory block 4, issues the next step code, and so on.

ί When a sign of the end of a character is recognized in a byte selected from block 4 of memory, the call to the latter is terminated. The mark is fully formed.

Thus, in the generator signs is reduced equipment.

Claims (1)

Claim The character generator containing serially connected the first counter and the first memory block, the first output of which is connected to the output of the character generator, the second output to the first input of the control unit, the first output of which is connected ¹⁰ to the first input of the first counter, characterized in that, for the sake of simplification a character generator, it contains a serially connected register and a second memory block, a decoder and a second counter, the first input of which is connected to the second output of the first memory block, the second input to the second output of the control unit the output to the second input of the first counter, the third input of which is connected to the output of the second memory block, the third output of the first memory block 30 is connected to the input of the decoder, the outputs of which are the outputs of the character generator, the register input connected to the third output of the control unit.