30001 P.C.B. 3" Disc drive
30002 P.C.B. 3" Disc drive
40007 Gate-Array version 1 (20RA043) (used in CPC464; with heat sink, other pin-outs than 40008/40010) 40008 Gate-Array version 2 (20RA043HSG3130) (rare version) (same pin-outs as 40010)
40009 32K ROM; O/S and BASIC for CPC464 (English)
40010 Gate-Array version 3 (HSG3170) (used in newer CPC464 and in CPC664/6128; no heat sink)
40015 16K ROM; DOS for CPC6128 and DDI-1 disc interface
40025 32K ROM; O/S and BASIC for CPC6128 (English)