In the past 33 years, on June 12, 1992 (Lunar Calendar 12 May 1992) China developed a microcomputer. The ZZ501B was successfully developed in 1992 as a ZZ501B. This computer has only 19.5 cm and 8.6 cm of width. With the general functionality of the microcomputer and the English display. The most prominent feature of this microcomputer developed by ZZC is the ability to communicate with the microcomputer, drive the printer and communicate remotely through modem, and also has the low power consumption, low voltage alarm, automatic shutdown, real-time clock and low temperature environment. The most prominent feature is its ability to display and programmable database management. It can show whether a work line of 4 rows of 10 characters or 821 rows of characters, which is the highest level of domestic computer