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Contextual Info: EPSON PF468-07 SMC6281 4-bit Single Chip Microcomputer • Core CPU Architecture • SVD Circuit/Comparator • Melody Circuit • DESCRIPTION The SMC6281 is an advanced single-chip CMOS 4-bit microcomputer consisting of the SMC6200 CMOS 4-bit core CPU. It also contains the ROM, RAM, LCD driver, time base counter and melody generation circuit.