• Mask ROM (MSM6404A) : 4000 words ¥ 8 bits External ROM (MSM6404VS) : 8196 words ¥ 8 bits • RAM (including the stack area) : 256 words ¥ 4 bits • I/O port Input-output port : 8 ports ¥ 4 bits Input port : 1 port ¥ 4 bits 4 bits are for input ports h...