Hi, the pins M1 -> nCE and U1 -> nWP are not findable in the samsung data sheets (in table 1-1 they appear as M1 -> /CE and U1 -> /WP). Also port Y21 is in the schematics at NCON0 but in the data sheets it's always Y21 -> NCON. The rest of the CPU is ok. Best wishes, André