我们已在85年10月8日的《计算机世界》上指出了6800与6809指令系统的不兼容性,在这里,我们进一步分析和研究一下两者的指令系统,为应用6800与6809的用户做一些基础工作,提供一些应用中的方便。一、6809对6800指令系统的扩展 6809是6800的改进型产品,内部可进行16位的运算,而外部数据总线是8位,指令数量从6800的107条扩展为137条,寻址方式也进行了扩展,机器码数从6800的197条扩展为1464条,由于其内部硬件的充实 We pointed out the incompatibility between the 6800 and the 6809 command system on October 8, 1985 in Computer World. Here, we further analyze and study the instruction set of the two, and do a good job for users of the 6800 and 6809 applications Some basic work, to provide some convenience in the application. First, the 6809 expansion of the 6800 command system The 6809 6800 is an improved product, the internal 16-bit operation can be carried out, and the external data bus is 8 bits, the number of commands from 6800 to expand the 107 to 137, the addressing method is also carried out Expansion of the machine code from the 6800 of 197 expanded to 1464, due to its internal hardware enrichment