keyboard printer
8.In consideration of the problems of manual reading and recording of pressure values in annulus pressure detection, a new surface pressure monitoring and recording instrument is developed All the functions of 8031 single chip computer are basically used in the instrument, of which the hardware system consists of a pressure sensor,a serial A/D converter and a serial EEPROM memory, a small keyboard with 4 keys,a character liquid crystal display module and a micropanel printer;
9.It consists of a big keyboard of chinese characters,automatic phototypesetting machine and a check system consisting of a chinese character generator and a laser scanning dot-matrix printer. The chinese character generator is composed of 32×32 dot-matrix implemented with E-shape soft magnetic-core.

