40007 Gate-Array version 1 (20RA043) (used in CPC464; with heat sink, other pin-outs than 40008/40010)
40008 Gate-Array version 2 (HSG3130) (rare version) (same pin-outs as 40010)
40009 32K ROM; O/S BIOS 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 AMSDOS for CPC664/CPC6128 and DDI-1 disc interface 40022 32K ROM; BIOS and BASIC for CPC664 (region unknown?) 40025 32K ROM; O/S BIOS and BASIC for CPC6128 (English)
40026 PCW8xxx printer controller ASIC
40028 PCW8xxx/9xxx main ASIC
40031 16L8 PAL; Ram management CPC6128
40037 32K ROM; O/S BIOS and BASIC for CPC464 (Spanish) 40038 32K ROM; O/S BIOS and BASIC for CPC6128 (Spanish) 40051 32K ROM; O/S BIOS and BASIC for CPC6128 (French)
40054 32K ROM; Spectrum +2
40058 Spectrum +2 ASIC