Is there anybody on the list who has the same experiance, or is there anybody who knows if the Z80 used in the ZX Spectrum has this special behavior? ---------- Working on the ZX Spectrum's joystick code I've "discovered" a courious thing: the IN A,(C) Z80 opcode does "IN A,(BC)" ! I guess every good Z80 programmer knows it, but it was new to me. ---------- Henk Poley <><