电子琴 R1用于暂存简谱码,R2用于暂存节拍码,R3用于暂存<送别>TABLE1表偏移量 R4用于暂存行首键值 R7暂存列扫描列号,R0暂存列扫描信号 20H存TL1值,21H存TH1值 -electronic musical instrument electronic musical instrument electronic musical instrument electronic musical instrument electronic musical in