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About the reset, read, check, write of 51 single chip microcomputer and 4442 chip card and the funct
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This is a card subtraction function code, used to expand the business printer supervision mechanism. The user writes the data before inserting the card. By inserting the card, the single chip microcomputer turns on the printer switch. After receiving the PC pulse, the card writes the data. When the byte data is 0, the printer is automatically powered off
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