How to transfer a Chinese character or shape using a computer printer port

摘要

The personal computer transmits a Chinese character or figure representation of one-bit combination of Chinese character or graphic data to the Chinese character or figure generating device connected to the printer port each time through the printer port and sends the code data to the Chinese character or figure generating device before the personal computer sends the data to the data bus of the printer port By informing the Chinese character type or figure generating device of the fact that the data of each of the individual sets are different from the data of the previous and subsequent ones and that the control signal is generated by using one automatic detection circuit and that the data can be already read out and completed, The computer promptly sends the data to the Chinese character or figure generator connected to the printer port and the Chinese character or figure generator transmits the data to the personal computer by using the status signal and the characteristic of the Chinese character or figure using Analysis, and statistics, the Chinese character type or figure generator can quickly transmit the data to the personal computer if the data code is written to the personal computer again after the personal computer receives the data and decodes the code to recover the original data .;The present invention comprises a data register, a comparator, a flip-flop, an AND gate and a NOR gate. When data is transferred, the comparator U3 (U4) is used to compare the data. (U1) and U2 (U6) and U8 (U6), and the NOR gate (U9), if the data are different from each other. The time base clock generation circuit generates a pulse and applies it to U1 and U2. One data is stored, new data is input to the other output interface, and the output interface rapidly (in a predetermined time) removes the data And prevents the later incoming data from erasing previous data.