I own its little brother, the PPC512DD. It is in fully working condition. As I understand it, the only difference is the amount of memory (512K vs 640K) and the

I own its little brother, the PPC512DD. It is in fully working condition. As I understand it, the only difference is the amount of memory (512K vs 640K) and the inbuilt modem of the 640. At some point I'll fathom how to add an external ISA slot to it, as apparently the expansion connector is compatible. Also, way back when the Amstrads were current, I upgraded my desktop PC 1512 with a NEC V20 (or was it a 30?) for that little bit of speed increase.