[[Image:CPC664 - 3.5 w RDY.jpg|frame|none|Schematics for PC disk drives with own READY signal on an Amstrad/Schneider CPC664/CPC6128 (Non-German CPC6128 only)]]
[[Image:CPC664 - 3.5 w wo RDY.jpg|frame|none|Schematics for PC disk drives without own READY signal on an Amstrad/Schneider CPC664/CPC6128 (Non-German CPC6128 only)]]
[[Image:CPC6128 - 3.5 w RDY.jpg|frame|none|Schematics for PC disk drives with own READY signal on a Schneider CPC6128 or a German Amstrad CPC6128]]