The basic circuit principle of the claw machine (Mary machine)

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Website: www.abc2008.com Circuit analysis: The main control chip is the U1-89C51 single-chip microcomputer, which contains an internal 4K EEPROM program. The program from 4K to 64K is constituted externally by U2-2751EPROM. The first 4K in 27512 is empty, followed by a 6OK program. The data bus is set up as a data line reset bit method for encryption (that is DO-D7, D1-D6, D2-D1, D4-D3, D5-D5, D6-D1, D7-DO). Before analyzing the program, it must be reset to its original program, and the 4K inside the CPU and the external 6OK are read together. U4-6116 is an expanded 2K RAM, U13, U14 are two YM2149 (891O) chips for sound synthesis and I/O interface output for 24 running lights, 6 left/right lights, and one top light. The pin 4 of U15-74LSO2 is the read selection signal for 2149, pin 1 is the write selection signal. U7-74LS138 is an eight-to-three decoder that decodes the high address A13, A14, A15 of 89C51. Through U7, pin 14 works with U15 on the read/write selection of U13, U14. Meanwhile, the pin 13 of U7 decodes the selection (/CS) signal for U16-8279 keyboard and DIP switch and numeric display LED control chip. Two pieces of U33, U32 4511 decode the BCD generated by 8279 into an eight-segment LED code, showing two numeric segments on the left and right. Three pieces of U29, U3O, U31 4O28 are BCD to ten decoders that translate specified numeric display positions from 8279. Through 74LSO4 and driver chip 2OO3, they provide position current for each numeric display LED. U5-74LSOO, U12-555, C4, T1 etc. constitute the reset circuit. U23-YM2413 generates music synthesis; U42 is the audio power amplifier LM38O, U38, U37 are input/output meter and coin motor drive signal chips. Three optocouplers U39, 4O, 41 are coin insertion, input/output meter detection chips. All other 74LSO4 and 2OO3 are output driver chips for the rotating lights.