The final cost down models came just before the release of the Amstrad plus.
The same chip was used within the late CPC464 and CPC6128.It performs the operations of the PAL used in the CPC6128, the Gate-Array used in older CPCs and the CRTC. =CRTC=
In CRTC terms it operates almost the same as the CRTC within the Plus ASIC.